CN107024567B - PH value electric signal generator circuit capable of simulating acid and alkali concentration - Google Patents
PH value electric signal generator circuit capable of simulating acid and alkali concentration Download PDFInfo
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- CN107024567B CN107024567B CN201710382657.2A CN201710382657A CN107024567B CN 107024567 B CN107024567 B CN 107024567B CN 201710382657 A CN201710382657 A CN 201710382657A CN 107024567 B CN107024567 B CN 107024567B
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Abstract
The invention discloses a pH value electric signal generator circuit capable of simulating acid and alkali concentration, which comprises: a positive voltage power supply circuit, a first pH value generation circuit, a negative voltage power supply circuit, a second pH value generation circuit and an electric signal output control circuit; the input end of the first pH value generating circuit is connected to the positive voltage power supply circuit, the first pH value generating circuit generates a first electric signal with the pH value in the range of [0,7] and outputs the first electric signal through the electric signal output control circuit, the input end of the second pH value generating circuit is connected to the negative voltage power supply circuit, and the second pH value generating circuit generates a second electric signal with the pH value in the range of [7, 14] and outputs the second electric signal through the electric signal output control circuit. The invention can generate voltage output corresponding to any pH value by adjusting the corresponding pH value generating circuit to replace pH test paper, acid and alkali standard liquid and a pH glass type sensor to check the accuracy of detecting the pH value of the debugging equipment.
Description
Technical Field
The invention relates to a signal source of a precise instrument, in particular to a pH value electric signal generator circuit which can simulate the concentration of acid and alkali and is used for checking the accuracy of pH value by using a pH value electric signal generator.
Background
At present, when a large number of water quality treatment equipment, electroplating equipment, acid and alkali solution detection equipment and instruments are produced, standard pH test paper and expensive glass type sensors and standard acid and alkali liquids are used for checking the accuracy of detecting the pH value, special care is taken when the pH test paper and the acid and alkali standard liquids are used and stored, the glass type sensors cannot be polluted, the glass type sensors are easy to break in use, and meanwhile, when some equipment is produced, the pH4 and pH7 values are required to be detected, operators need to use the sensors of the same type to test the two standard pH liquids for interactive test, so that great errors are easy to cause, operation matters are very complicated, great difficulty is brought to production and detection work, and for this reason, the applicant designs a pH electric signal generator circuit which can replace the functions of the pH test paper, the acid and alkali standard liquids and the pH glass type sensors.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a pH value electric signal generator circuit capable of simulating the concentration of acid and alkali, which can replace pH test paper, acid and alkali standard liquid and a pH glass type sensor to check the accuracy of detecting the pH value of debugging equipment by adjusting the corresponding pH value generating circuit to generate voltage output corresponding to any pH value.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a pH electrical signal generator circuit, comprising: a positive voltage power supply circuit, a first pH value generation circuit, a negative voltage power supply circuit, a second pH value generation circuit and an electric signal output control circuit;
the input end of the first pH value generating circuit is connected to the positive voltage power supply circuit, the first pH value generating circuit generates a first electric signal with the pH value in the range of [0,7] and outputs the first electric signal through the electric signal output control circuit, the input end of the second pH value generating circuit is connected to the negative voltage power supply circuit, and the second pH value generating circuit generates a second electric signal with the pH value in the range of [7, 14] and outputs the second electric signal through the electric signal output control circuit.
Further, the positive voltage power supply circuit comprises a direct current power supply, the first pH value generating circuit comprises a resistor R1, a resistor R3 and a sliding rheostat W2, the negative voltage power supply circuit comprises a negative power supply generator, and the second pH value generating circuit comprises a resistor R2, a resistor R4 and a sliding rheostat W3;
wherein: the output end of the direct current power supply is connected to the first fixed end of the sliding rheostat W2 through a resistor R1 and a resistor R3 in sequence, the second fixed end of the sliding rheostat W2 is grounded, and the sliding end of the sliding rheostat W2 is connected between the resistor R3 and the first fixed end of the sliding rheostat W2; the power end of the negative power generator is connected to the output end of the direct current power supply, the output end of the negative power generator is connected to the first fixed end of the sliding rheostat W3 through a resistor R2 and a resistor R4 in sequence, the second fixed end of the sliding rheostat W3 is grounded, and the sliding end of the sliding rheostat W3 is connected between the resistor R4 and the first fixed end of the sliding rheostat W3;
the sliding end of the sliding rheostat W2 and the sliding end of the sliding rheostat W3 are connected to the input end of the electric signal output control circuit.
Further, the pH value electric signal generator circuit further comprises a first voltage stabilizing circuit and a second voltage stabilizing circuit, wherein the first voltage stabilizing circuit comprises a first voltage stabilizer and a first filter circuit; the second voltage stabilizing circuit comprises a second voltage stabilizer and a second filter circuit, the first voltage stabilizer and the second voltage stabilizer are voltage stabilizing sources TL431, the anode of the first voltage stabilizer and the cathode of the second voltage stabilizer are grounded, the cathode of the first voltage stabilizer is connected between a resistor R1 and a resistor R3, the anode of the second voltage stabilizer is connected between a resistor R2 and a resistor R4, the reference electrode of the first voltage stabilizer is connected to the cathode of the first voltage stabilizer, the reference electrode of the second voltage stabilizer is connected to the cathode of the second voltage stabilizer, the first filter circuit and the second filter circuit are capacitors C6 and C7 respectively, one ends of the capacitors C6 and C7 are connected to the cathode of the first voltage stabilizer and the anode of the second voltage stabilizer respectively, and the other ends of the capacitors C6 and C7 are grounded.
Further, the electric signal output control circuit comprises a sliding rheostat W1 and a voltage dividing circuit, the voltage dividing circuit comprises a resistor R5 and a resistor R7, two fixed ends of the sliding rheostat W1 are respectively connected to a sliding end of a sliding rheostat W2 and a sliding end of a sliding rheostat W3, and the sliding end of the sliding rheostat W1 sequentially outputs a third electric signal through the resistor R5 and an output terminal; one end of the resistor R7 is connected between the resistor R5 and the output terminal, and the other end of the resistor R7 is grounded.
Further, the electric signal output control circuit further includes a third filter circuit, the third filter circuit includes a resistor R6 and a capacitor C10, one end of the resistor R6 is connected between the resistor R5 and the resistor R7, the other end of the resistor R6 is connected to the output terminal, one end of the capacitor C10 is grounded, and the other end of the capacitor C10 is connected between the resistor R6 and the output terminal.
Further, the positive voltage power supply circuit further includes a fourth filter circuit and a switch S1, the negative voltage power supply circuit further includes a fifth filter circuit, the fourth filter circuit includes an electrolytic capacitor CE1 and a capacitor C6, the fifth filter circuit includes an electrolytic capacitor C3, a capacitor C4 and a capacitor C5, one ends of the positive electrode and the capacitor C6 of the electrolytic capacitor CE1 are connected between the output end of the dc power supply and the resistor R1, the other ends of the negative electrode and the capacitor C6 of the electrolytic capacitor CE1 are grounded, the switch S1 is connected between the output end of the dc power supply and the positive electrode of the electrolytic capacitor CE1, one ends of the positive electrode and the capacitor C4 of the electrolytic capacitor C3 are connected between the output end of the negative power supply generator and the resistor R2, and the other ends of the negative electrode and the capacitor C4 of the electrolytic capacitor C3 are grounded, and the output end of the dc power supply is connected to the power end of the negative power supply generator through the switch S1.
Further, the positive voltage power supply circuit comprises a direct current power supply, the first pH value generating circuit comprises a resistor R1, a resistor R3 and a sliding rheostat W2, the negative voltage power supply circuit comprises a negative power supply generator, and the second pH value generating circuit comprises a resistor R2, a resistor R4, a resistor R5 and a sliding rheostat W3;
wherein: the output end of the direct current power supply is connected to the first fixed end of the sliding rheostat W2 through a resistor R1 and a resistor R3 in sequence, and the second fixed end of the sliding rheostat W2 is grounded; the power end of the negative power generator is connected to the output end of the direct current power supply, the output end of the negative power generator is connected to the first fixed end of the sliding rheostat W3 through a resistor R2 and a resistor R4 in sequence, and the second fixed end of the sliding rheostat W3 is connected between the resistor R1 and the resistor R3 through a resistor R5;
the sliding end of the sliding rheostat W2 and the sliding end of the sliding rheostat W3 are connected to the input end of the electric signal output control circuit.
Further, the pH value electric signal generator circuit further comprises a first voltage stabilizing circuit and a second voltage stabilizing circuit, wherein the first voltage stabilizing circuit comprises a first voltage stabilizer and a first filter circuit; the second voltage stabilizing circuit comprises a second voltage stabilizer and a second filter circuit, the first voltage stabilizer and the second voltage stabilizer are voltage stabilizing sources TL431, the anode of the first voltage stabilizer and the cathode of the second voltage stabilizer are grounded, the cathode of the first voltage stabilizer is connected between a resistor R1 and a resistor R3, the anode of the second voltage stabilizer is connected between a resistor R2 and a resistor R4, the reference electrode of the first voltage stabilizer is connected to the cathode of the first voltage stabilizer, the reference electrode of the second voltage stabilizer is connected to the cathode of the second voltage stabilizer, the first filter circuit and the second filter circuit are capacitors C6 and C7 respectively, one ends of the capacitors C6 and C7 are connected to the cathode of the first voltage stabilizer and the anode of the second voltage stabilizer respectively, and the other ends of the capacitors C6 and C7 are grounded.
Further, the electric signal output control circuit comprises a single-pole double-throw switch S2 and a third filter circuit, the third filter circuit comprises a resistor R6 and a capacitor C10, two stationary contacts of the single-pole double-throw switch S2 are respectively connected to a sliding end of the sliding rheostat W2 and a sliding end of the sliding rheostat W3, a movable contact of the single-pole double-throw switch S2 sequentially outputs a third electric signal through the resistor R6 and an output terminal, one end of the capacitor C10 is grounded, and the other end of the capacitor C10 is connected between the resistor R6 and the output terminal.
Further, the positive voltage power supply circuit further includes a fourth filter circuit and a switch S1, the negative voltage power supply circuit further includes a fifth filter circuit, the fourth filter circuit includes an electrolytic capacitor CE1 and a capacitor C6, the fifth filter circuit includes an electrolytic capacitor C3, a capacitor C4 and a capacitor C5, one ends of the positive electrode and the capacitor C6 of the electrolytic capacitor CE1 are connected between the output end of the dc power supply and the resistor R1, the other ends of the negative electrode and the capacitor C6 of the electrolytic capacitor CE1 are grounded, the switch S1 is connected between the output end of the dc power supply and the positive electrode of the electrolytic capacitor CE1, one ends of the positive electrode and the capacitor C4 of the electrolytic capacitor C3 are connected between the output end of the negative power supply generator and the resistor R2, and the other ends of the negative electrode and the capacitor C4 of the electrolytic capacitor C3 are grounded, and the output end of the dc power supply is connected to the power end of the negative power supply generator through the switch S1.
Compared with the prior art, the invention has the beneficial effects that:
the device skillfully utilizes a positive voltage power supply circuit, a negative voltage power supply circuit and a pH value generating circuit (realized by a sliding rheostat) to generate a voltage signal corresponding to the pH value, so that when the accuracy of detecting the pH value of equipment or instrument to be checked is checked, the voltage signal corresponding to the pH value to be checked is only generated by the pH value electric signal generator circuit and is output to the corresponding equipment or instrument to be checked.
Drawings
FIG. 1 is a schematic circuit diagram of a first embodiment of a pH value electric signal generator circuit capable of simulating acid and alkali concentrations;
FIG. 2 is a schematic circuit diagram of a second embodiment of a pH value electric signal generator circuit capable of simulating the concentration of acid and alkali.
Detailed Description
The invention will be further described with reference to the accompanying drawings and detailed description below:
example 1
A pH electrical signal generator circuit that simulates acid and base concentrations, comprising: a positive voltage power supply circuit, a first pH value generation circuit, a negative voltage power supply circuit, a second pH value generation circuit and an electric signal output control circuit;
the input end of the first pH value generating circuit is connected to the positive voltage power supply circuit, the first pH value generating circuit generates a first electric signal with the pH value in the range of [0,7] and outputs the first electric signal through the electric signal output control circuit, the input end of the second pH value generating circuit is connected to the negative voltage power supply circuit, and the second pH value generating circuit generates a second electric signal with the pH value in the range of [7, 14] and outputs the second electric signal through the electric signal output control circuit.
Specifically, referring to fig. 1, the positive voltage power supply circuit includes a dc power supply, a fourth filter circuit and a switch S1, the first pH generating circuit includes a resistor R1, a resistor R3 and a sliding resistor W2, the negative voltage power supply circuit includes a negative power generator and a second pH generating circuit includes a resistor R2, a resistor R4 and a sliding resistor W3, the fourth filter circuit includes an electrolytic capacitor CE1 and a capacitor C6, and the fifth filter circuit includes an electrolytic capacitor C3, a capacitor C4 and a capacitor C5;
wherein: the output end of the direct current power supply is connected to the first fixed end of the sliding rheostat W2 sequentially through a switch S1, a resistor R1 and a resistor R3, the second fixed end of the sliding rheostat W2 is grounded, and the sliding end of the sliding rheostat W2 is connected between the resistor R3 and the first fixed end of the sliding rheostat W2; one end of the positive electrode of the electrolytic capacitor CE1 and one end of the capacitor C6 are connected between the switch S1 and the resistor R1, and the other ends of the negative electrode of the electrolytic capacitor CE1 and the capacitor C6 are grounded; the output end of the direct current power supply is connected to the power end of the negative power supply generator through a switch S1, the output end of the negative power supply generator is connected to the first fixed end of the sliding rheostat W3 through a resistor R2 and a resistor R4 in sequence, the second fixed end of the sliding rheostat W3 is grounded, and the sliding end of the sliding rheostat W3 is connected between the resistor R4 and the first fixed end of the sliding rheostat W3; the anode of the electrolytic capacitor C3, one end of the capacitor C4 and one end of the capacitor C5 are all connected between the output end of the negative power generator and the resistor R2, and the cathode of the electrolytic capacitor C3, the other end of the capacitor C4 and the other end of the capacitor C5 are all grounded; the sliding end of the sliding rheostat W2 and the sliding end of the sliding rheostat W3 are both connected to the input end of the electric signal output control circuit.
The pH value electric signal generator circuit further comprises a first voltage stabilizing circuit and a second voltage stabilizing circuit, wherein the first voltage stabilizing circuit comprises a first voltage stabilizer and a first filter circuit; the second voltage stabilizing circuit comprises a second voltage stabilizer and a second filter circuit, the first voltage stabilizer and the second voltage stabilizer are voltage stabilizing sources TL431, the anode of the first voltage stabilizer and the cathode of the second voltage stabilizer are grounded, the cathode of the first voltage stabilizer is connected between a resistor R1 and a resistor R3, the anode of the second voltage stabilizer is connected between a resistor R2 and a resistor R4, the reference electrode of the first voltage stabilizer is connected to the cathode of the first voltage stabilizer, the reference electrode of the second voltage stabilizer is connected to the cathode of the second voltage stabilizer, the first filter circuit and the second filter circuit are a capacitor C6 and a capacitor C7 respectively, one end of the capacitor C6 and one end of the capacitor C7 are connected to the cathode of the first voltage stabilizer and the anode of the second voltage stabilizer respectively, and the other end of the capacitor C6 and the other end of the capacitor C7 are grounded.
The electric signal output control circuit comprises a sliding rheostat W1, a voltage dividing circuit and a third filter circuit, wherein the voltage dividing circuit comprises a resistor R5 and a resistor R7, two fixed ends of the sliding rheostat W1 are respectively connected to a sliding end of a sliding rheostat W2 and a sliding end of a sliding rheostat W3, and the sliding end of the sliding rheostat W1 sequentially outputs a third electric signal through the resistor R5 and an output terminal; one end of the resistor R7 is connected between the resistor R5 and the output terminal, and the other end of the resistor R7 is grounded; the third filter circuit comprises a resistor R6 and a capacitor C10, one end of the resistor R6 is connected between the resistor R5 and the resistor R7, the other end of the resistor R6 is connected to the output terminal, one end of the capacitor C10 is grounded, and the other end of the capacitor C10 is connected between the resistor R6 and the output terminal J2.
The working principle is as follows: after the switch S1 is closed, the input terminal and the external direct current power supply are connected to the fourth filter circuit to output +5V voltage, then +2.5V voltage is output after passing through the resistor R1 and the first voltage stabilizer (the controllable voltage stabilizing source IC 15), the sliding rheostat W2 can generate a first electric signal with the pH value within the range of [0,7], namely, the first electric signal corresponds to the pH value within the range of [0,7], and any first electric signal has a corresponding pH value within the range of [0,7 ]; similarly, the negative voltage generator outputs-5V voltage through the fifth filter, then outputs-2.5V voltage through the resistor R2 and the second voltage stabilizer (controllable voltage stabilizing source IC 16), the sliding rheostat W3 can generate a second electric signal with a pH value within the range of [7, 14] (the second electric signal can have more crossing values with the first electric signal, of course, in order to distinguish, the second electric signal can also not include the value of the front end point 7), that is, the second electric signal corresponds to the pH value within the range of [7, 14], any second electric signal has a corresponding pH value within the range of [7, 14], finally, the corresponding electric signal is regulated by W1, and the third electric signal is output to the equipment or instrument to be verified through the voltage dividing circuit and the third filtering circuit by the output terminal J2, wherein the sliding rheostat W2 and the sliding rheostat W3 can be regarded as rough adjustment of the pH value, and the sliding rheostat W1 is fine adjustment; the corresponding pH value of the third electric signal output can be obtained by measuring through an oscilloscope (or a voltmeter), and comparing the electric signal with a relation chart of the pH value, or can be obtained by directly setting corresponding scales on the sliding varistors W1-3, and loading the third electric signal with the corresponding pH value obtained by adjusting the sliding varistors W1-3 to the corresponding scales onto the equipment or instrument to be verified.
Example two
Unlike example one, example two split the pH generation into two parts: one part is [0,7], the other part is [7, 14], although more intersections can exist between the two parts, and the two parts are isolated by a single pole double throw switch S2.
Referring to fig. 2, the positive voltage power supply circuit includes a dc power supply, a fourth filter circuit and a switch S1, the first pH generating circuit includes a resistor R1, a resistor R3 and a sliding resistor W2, the negative voltage power supply circuit includes a negative power generator and a second pH generating circuit includes a resistor R2, a resistor R4, a resistor R5 and a sliding resistor W3, the fourth filter circuit includes an electrolytic capacitor CE1 and a capacitor C6, and the fifth filter circuit includes an electrolytic capacitor C3, a capacitor C4 and a capacitor C5;
wherein: the output end of the direct current power supply is connected to the first fixed end of the sliding rheostat W2 through a switch S1, a resistor R1 and a resistor R3 in sequence, and the second fixed end of the sliding rheostat W2 is grounded; one end of the positive electrode of the electrolytic capacitor CE1 and one end of the capacitor C6 are connected between the switch S1 and the resistor R1, and the other ends of the negative electrode of the electrolytic capacitor CE1 and the capacitor C6 are grounded; the output end of the direct current power supply is connected to the power end of the negative power supply generator through a switch S1, the output end of the negative power supply generator is connected to the first fixed end of the sliding rheostat W3 through a resistor R2 and a resistor R4 in sequence, and the second fixed end of the sliding rheostat W3 is connected between the resistor R1 and the resistor R3 after passing through a resistor R5; the anode of the electrolytic capacitor C3, one end of the capacitor C4 and one end of the capacitor C5 are all connected between the output end of the negative power generator and the resistor R2, and the cathode of the electrolytic capacitor C3, the other end of the capacitor C4 and the other end of the capacitor C5 are all grounded; the sliding end of the sliding rheostat W2 and the sliding end of the sliding rheostat W3 are both connected to the input end of the electric signal output control circuit.
The pH value electric signal generator circuit further comprises a first voltage stabilizing circuit and a second voltage stabilizing circuit, wherein the first voltage stabilizing circuit comprises a first voltage stabilizer and a first filter circuit; the second voltage stabilizing circuit comprises a second voltage stabilizer and a second filter circuit, the first voltage stabilizer and the second voltage stabilizer are voltage stabilizing sources TL431, the anode of the first voltage stabilizer and the cathode of the second voltage stabilizer are grounded, the cathode of the first voltage stabilizer is connected between a resistor R1 and a resistor R3, the anode of the second voltage stabilizer is connected between a resistor R2 and a resistor R4, the reference electrode of the first voltage stabilizer is connected to the cathode of the first voltage stabilizer, the reference electrode of the second voltage stabilizer is connected to the cathode of the second voltage stabilizer, the first filter circuit and the second filter circuit are a capacitor C6 and a capacitor C7 respectively, one end of the capacitor C6 and one end of the capacitor C7 are connected to the cathode of the first voltage stabilizer and the anode of the second voltage stabilizer respectively, and the other end of the capacitor C6 and the other end of the capacitor C7 are grounded.
The electric signal output control circuit comprises a single-pole double-throw switch S2 and a third filter circuit, the third filter circuit comprises a resistor R6 and a capacitor C10, two stationary contacts of the single-pole double-throw switch S2 are respectively connected to a sliding end of the sliding rheostat W2 and a sliding end of the sliding rheostat W3, a movable contact of the single-pole double-throw switch S2 sequentially outputs a third electric signal through the resistor R6 and an output terminal, one end of the capacitor C10 is grounded, and the other end of the capacitor C10 is connected between the resistor R6 and the output terminal.
The working principle is the same as that of the first embodiment, except that when the electric signal output control circuit is connected to the sliding end of the sliding rheostat W2 through a single-pole double-throw switch, the output terminal J2 outputs a corresponding third electric signal within the range of pH values [0,7 ]; and when the single pole double throw switch is connected to the sliding end of the sliding rheostat W3, the output terminal J2 outputs a corresponding third electric signal within the pH value range [7, 14 ].
It will be apparent to those skilled in the art from this disclosure that various other changes and modifications can be made which are within the scope of the invention as defined in the appended claims.
Claims (9)
1. A pH electric signal generator circuit capable of simulating acid and base concentrations, comprising: a positive voltage power supply circuit, a first pH value generation circuit, a negative voltage power supply circuit, a second pH value generation circuit and an electric signal output control circuit;
the input end of the first pH value generating circuit is connected to the positive voltage power supply circuit, the first pH value generating circuit generates a first electric signal with the pH value in the range of [0,7] and outputs the first electric signal through the electric signal output control circuit, the input end of the second pH value generating circuit is connected to the negative voltage power supply circuit, and the second pH value generating circuit generates a second electric signal with the pH value in the range of [7, 14] and outputs the second electric signal through the electric signal output control circuit;
the positive voltage power supply circuit comprises a direct current power supply, the first pH value generating circuit comprises a resistor R1, a resistor R3 and a sliding rheostat W2, the negative voltage power supply circuit comprises a negative power supply generator, and the second pH value generating circuit comprises a resistor R2, a resistor R4 and a sliding rheostat W3;
wherein: the output end of the direct current power supply is connected to the first fixed end of the sliding rheostat W2 through a resistor R1 and a resistor R3 in sequence, the second fixed end of the sliding rheostat W2 is grounded, and the sliding end of the sliding rheostat W2 is connected between the resistor R3 and the first fixed end of the sliding rheostat W2; the power end of the negative power generator is connected to the output end of the direct current power supply, the output end of the negative power generator is connected to the first fixed end of the sliding rheostat W3 through a resistor R2 and a resistor R4 in sequence, the second fixed end of the sliding rheostat W3 is grounded, and the sliding end of the sliding rheostat W3 is connected between the resistor R4 and the first fixed end of the sliding rheostat W3;
the sliding end of the sliding rheostat W2 and the sliding end of the sliding rheostat W3 are connected to the input end of the electric signal output control circuit.
2. The pH electric signal generator circuit of claim 1, further comprising a first voltage regulator circuit and a second voltage regulator circuit, the first voltage regulator circuit comprising a first voltage regulator and a first filter circuit; the second voltage stabilizing circuit comprises a second voltage stabilizer and a second filter circuit, the first voltage stabilizer and the second voltage stabilizer are voltage stabilizing sources TL431, the anode of the first voltage stabilizer and the cathode of the second voltage stabilizer are grounded, the cathode of the first voltage stabilizer is connected between a resistor R1 and a resistor R3, the anode of the second voltage stabilizer is connected between a resistor R2 and a resistor R4, the reference electrode of the first voltage stabilizer is connected to the cathode of the first voltage stabilizer, the reference electrode of the second voltage stabilizer is connected to the cathode of the second voltage stabilizer, the first filter circuit and the second filter circuit are capacitors C6 and C7 respectively, one ends of the capacitors C6 and C7 are connected to the cathode of the first voltage stabilizer and the anode of the second voltage stabilizer respectively, and the other ends of the capacitors C6 and C7 are grounded.
3. The pH electric signal generator circuit according to claim 1 or 2, wherein the electric signal output control circuit comprises a sliding rheostat W1, a voltage dividing circuit, the voltage dividing circuit comprises a resistor R5 and a resistor R7, two fixed ends of the sliding rheostat W1 are respectively connected to a sliding end of a sliding rheostat W2 and a sliding end of a sliding rheostat W3, and the sliding end of the sliding rheostat W1 sequentially outputs a third electric signal through the resistor R5 and an output terminal; one end of the resistor R7 is connected between the resistor R5 and the output terminal, and the other end of the resistor R7 is grounded.
4. A pH value electric signal generator circuit as claimed in claim 3, wherein said electric signal output control circuit further comprises a third filter circuit, said third filter circuit comprising a resistor R6 and a capacitor C10, one end of said resistor R6 being connected between a resistor R5 and a resistor R7, the other end of said resistor R6 being connected to an output terminal, one end of said capacitor C10 being grounded, the other end of said capacitor C10 being connected between said resistor R6 and an output terminal.
5. The pH electric signal generator circuit according to claim 1, wherein the positive voltage power supply circuit further comprises a fourth filter circuit and a switch S1, the negative voltage power supply circuit further comprises a fifth filter circuit, the fourth filter circuit comprises an electrolytic capacitor CE1 and a capacitor C6, the fifth filter circuit comprises an electrolytic capacitor C3, a capacitor C4 and a capacitor C5, one ends of the positive electrode and the capacitor C6 of the electrolytic capacitor CE1 are connected between the output terminal of the dc power supply and the resistor R1, the negative electrode of the electrolytic capacitor CE1 and the other end of the capacitor C6 are grounded, the switch S1 is connected between the output terminal of the dc power supply and the positive electrode of the electrolytic capacitor CE1, one end of the electrolytic capacitor C3, one end of the capacitor C4 and one end of the capacitor C5 are connected between the output terminal of the negative power supply generator and the resistor R2, the negative electrode of the electrolytic capacitor C3, the other end of the capacitor C4 and the other end of the capacitor C5 are grounded, and the output terminal of the dc power supply is connected to the power supply terminal of the negative power supply generator through the switch S1.
6. The pH electric signal generator circuit of claim 1, wherein the positive voltage power supply circuit comprises a dc power supply, the first pH generating circuit comprises a resistor R1, a resistor R3, and a sliding resistor W2, the negative voltage power supply circuit comprises a negative power supply generator, and the second pH generating circuit comprises a resistor R2, a resistor R4, a resistor R5, and a sliding resistor W3;
wherein: the output end of the direct current power supply is connected to the first fixed end of the sliding rheostat W2 through a resistor R1 and a resistor R3 in sequence, and the second fixed end of the sliding rheostat W2 is grounded; the power end of the negative power generator is connected to the output end of the direct current power supply, the output end of the negative power generator is connected to the first fixed end of the sliding rheostat W3 through a resistor R2 and a resistor R4 in sequence, and the second fixed end of the sliding rheostat W3 is connected between the resistor R1 and the resistor R3 through a resistor R5;
the sliding end of the sliding rheostat W2 and the sliding end of the sliding rheostat W3 are connected to the input end of the electric signal output control circuit.
7. The pH electric signal generator circuit of claim 6, further comprising a first voltage regulator circuit and a second voltage regulator circuit, the first voltage regulator circuit comprising a first voltage regulator and a first filter circuit; the second voltage stabilizing circuit comprises a second voltage stabilizer and a second filter circuit, the first voltage stabilizer and the second voltage stabilizer are voltage stabilizing sources TL431, the anode of the first voltage stabilizer and the cathode of the second voltage stabilizer are grounded, the cathode of the first voltage stabilizer is connected between a resistor R1 and a resistor R3, the anode of the second voltage stabilizer is connected between a resistor R2 and a resistor R4, the reference electrode of the first voltage stabilizer is connected to the cathode of the first voltage stabilizer, the reference electrode of the second voltage stabilizer is connected to the cathode of the second voltage stabilizer, the first filter circuit and the second filter circuit are capacitors C6 and C7 respectively, one ends of the capacitors C6 and C7 are connected to the cathode of the first voltage stabilizer and the anode of the second voltage stabilizer respectively, and the other ends of the capacitors C6 and C7 are grounded.
8. The pH value electric signal generator circuit according to claim 6 or 7, wherein the electric signal output control circuit includes a single-pole double-throw switch S2 and a third filter circuit, the third filter circuit includes a resistor R6 and a capacitor C10, two stationary contacts of the single-pole double-throw switch S2 are respectively connected to a sliding end of the sliding rheostat W2 and a sliding end of the sliding rheostat W3, the movable contact of the single-pole double-throw switch S2 sequentially outputs a third electric signal through the resistor R6 and an output terminal, one end of the capacitor C10 is grounded, and the other end of the capacitor C10 is connected between the resistor R6 and the output terminal.
9. The pH electric signal generator circuit according to claim 6, wherein the positive voltage power supply circuit further comprises a fourth filter circuit and a switch S1, the negative voltage power supply circuit further comprises a fifth filter circuit, the fourth filter circuit comprises an electrolytic capacitor CE1 and a capacitor C6, the fifth filter circuit comprises an electrolytic capacitor C3, a capacitor C4 and a capacitor C5, one ends of the positive electrode and the capacitor C6 of the electrolytic capacitor CE1 are connected between the output terminal of the dc power supply and the resistor R1, the negative electrode of the electrolytic capacitor CE1 and the other end of the capacitor C6 are grounded, the switch S1 is connected between the output terminal of the dc power supply and the positive electrode of the electrolytic capacitor CE1, one end of the electrolytic capacitor C3, one end of the capacitor C4 and one end of the capacitor C5 are connected between the output terminal of the negative power supply generator and the resistor R2, the negative electrode of the electrolytic capacitor C3, the other end of the capacitor C4 and the other end of the capacitor C5 are grounded, and the output terminal of the dc power supply is connected to the power supply terminal of the negative power supply generator through the switch S1.
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| CN201710382657.2A CN107024567B (en) | 2017-05-26 | 2017-05-26 | PH value electric signal generator circuit capable of simulating acid and alkali concentration |
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| CN206848232U (en) * | 2017-05-26 | 2018-01-05 | 深圳市通恒科技有限公司 | It is a kind of to simulate acid, the pH value electric signal generator circuit of alkali concn |
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| CN2809595Y (en) * | 2005-07-19 | 2006-08-23 | 谈国民 | Self-correction mutual-correction device for PH meter and ion meter |
| CN203054658U (en) * | 2012-12-06 | 2013-07-10 | 四川高软软件科技有限公司 | Adjustable high-precision integrated voltage stabilizing system |
| CN203178231U (en) * | 2013-01-29 | 2013-09-04 | 云南民族大学 | Ph measuring instrument |
| CN103353469B (en) * | 2013-06-25 | 2015-04-22 | 江苏物联网研究发展中心 | Practical soil PH value detection circuit |
| CN204103760U (en) * | 2014-11-06 | 2015-01-14 | 航天长峰朝阳电源有限公司 | Positive negative output single channel continuously adjustabe power module |
| CN105226970A (en) * | 2015-10-28 | 2016-01-06 | 航天长峰朝阳电源有限公司 | The D.C. regulated power supply that output polarity is changed automatically |
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