CN209327497U - A kind of pen type testing device - Google Patents
A kind of pen type testing device Download PDFInfo
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- CN209327497U CN209327497U CN201821932215.7U CN201821932215U CN209327497U CN 209327497 U CN209327497 U CN 209327497U CN 201821932215 U CN201821932215 U CN 201821932215U CN 209327497 U CN209327497 U CN 209327497U
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Abstract
The utility model relates to a kind of pen type testing devices, including, oscillating circuit, lighting circuit, buzzer, buzzer drive circuit, power circuit and detection probe, the detection probe is connect with oscillating circuit, for being connect with cable to be detected, and power circuit oscillating circuit is set to power in cable conducting, and generate oscillator signal；The buzzer drive circuit is connect with oscillating circuit, and is configured to when receiving oscillator signal, and driving buzzer generates buzzing；The lighting circuit is connect by a light switch with power circuit, and in light switch closure, the lighting circuit is powered.The utility model circuit design is simple, and manufacturing cost is low, and has lighting circuit, can individually control illumination functions, convenient to use in dim lights environment, very convenient.
Description
Technical field
The utility model relates to electrical detection instrument, especially a kind of pen type testing device with illumination functions.
Background technique
Testing device refers to and can be used for detecting the equipment whether route corresponding relationship is connected to.Existing testing device on the market
When carrying out conducting school line, it is sometimes necessary to which than darker, when detection is illuminated the interior of the cabinet light of detection, is operated very
Inconvenience, on the other hand, sometimes point to be detected is apart from distant, the limitation of the examined probe length of cable of testing device,
It is difficult to satisfy the use demand, and the circuit design of existing testing device is complex, manufacturing cost is also relatively high.
Given this utility model is proposed.
Utility model content
The purpose of the utility model is to overcome the deficiencies in the prior art, provide a kind of pen type testing device, set with circuit
Simple, good reliability is counted, and is capable of providing illumination functions, one meets the use under dim lights environment.
In order to realize the purpose, the utility model adopts the following technical solution:
A kind of pen type testing device, including, oscillating circuit, lighting circuit, buzzer, buzzer drive circuit, power circuit
And detection probe, the detection probe are connect with oscillating circuit, are made for connecting with cable to be detected, and in cable conducting
Power circuit is oscillating circuit power supply, and generates oscillator signal；
The buzzer drive circuit is connect with oscillating circuit, and is configured to when receiving oscillator signal, and buzzing is driven
Device generates buzzing；
The lighting circuit is connect by a light switch with power circuit, and in light switch closure, the illumination
Power on circuitry.
It further, further include first capacitor, the oscillating circuit is connect by first capacitor with power circuit, the detection
Probe is a pair, and is connected to the both ends of first capacitor, keeps first capacitor short-circuit when the connection of two detection probes, power supply electricity
Road is connected with oscillating circuit.
Further, the oscillating circuit is triode oscillating circuit.
Further, the triode oscillating circuit includes the closed loop that second, third capacitor is constituted, the 4th triode
Collector the base stage in the 5th triode is connect by the second capacitor, the collector of the 5th triode is connect by third capacitor
The emitter of the base stage of four triodes, the 4th triode and the 5th triode is grounded；Second capacitor by the 7th resistance with
Power circuit connection, third capacitor are connect by the 6th resistance and first capacitor with power circuit.
Further, the lighting circuit includes, with the concatenated LED light of light switch and the 9th resistance.
Further, the buzzer drive circuit includes the second triode, the collector and oscillating circuit of the second triode
Connection, emitter connect with the base stage of the first triode, the collector of first triode and respectively with buzzer and second
Transistor base connection, the emitter ground connection of the first triode, the other end of the buzzer connect power circuit.
Further, the buzzer is also in parallel with a freewheeling diode.
Further, the power circuit includes power switch and power supply, and the power supply passes through power switch point
It is not connect with oscillating circuit, lighting circuit, buzzer.
Further, the power supply is rechargeable battery.
Further, the detection probe is connect by pluggable plug with oscillating circuit.
After technical solution described in the utility model, bring it is following the utility model has the advantages that
The utility model generates oscillator signal by oscillating circuit, and is transferred to buzzer drive circuit, and then drives bee
The device that rings issues the sound, and circuit design is simple, and good reliability, manufacturing cost is low, and the utility model has lighting circuit, can be with
Individually control illumination functions, convenient to use in dim lights environment, detection probe uses plug-in structure, in detection point phase
When gathering farther out, the connecting line of detection probe can be replaced, it is applied widely to meet requirement.
Detailed description of the invention
Fig. 1: the principles of the present invention figure；
Fig. 2: the circuit diagram of the utility model.
Specific embodiment
Specific embodiment of the present utility model is described in further detail with reference to the accompanying drawing.
As depicted in figs. 1 and 2, a kind of pen type testing device, including, oscillating circuit, lighting circuit, buzzer BEEP, buzzing
Device driving circuit, power circuit and detection probe, further include first capacitor C1, and the oscillating circuit passes through first capacitor C1 and electricity
Source circuit connection, the detection probe are connect with oscillating circuit, are made for connecting with cable to be detected, and in cable conducting
Power circuit is oscillating circuit power supply, and generates oscillator signal.The detection probe is a pair, and is connected to first capacitor
The both ends of C1 keep first capacitor C1 short-circuit when the connection of two detection probes, and power circuit is connected with oscillating circuit.The detection
Probe is connect by pluggable plug X4 with oscillating circuit, the model that the connecting line of detection probe has different lengths different,
To satisfy the use demand.The buzzer drive circuit is connect with oscillating circuit, and is configured to when receiving oscillator signal, is driven
Dynamic buzzer BEEP generates buzzing；The lighting circuit is connect by a light switch with power circuit, and is closed in light switch
When conjunction, the lighting circuit is powered.
The lighting circuit includes that, with the concatenated LED light of light switch and the 9th resistance R9, the light switch is first
Switch X1, first switch X1 are sequentially connected in series with the 9th resistance R9, LED light.
The power circuit includes power switch and power supply, the power supply by power switch respectively with oscillation
Circuit, lighting circuit, buzzer BEEP connection.Specifically, the power switch is second switch X2, VCC termination+5V electricity
The input terminal of source, the end VCC1 and oscillating circuit connects, and in second switch X2 closure, the end VCC is connected with the end VCC1.
Specifically, the oscillating circuit is triode oscillating circuit.
The triode oscillating circuit includes the closed loop that second, third capacitor C2, C3 are constituted, the 4th triode Q4
Collector the base stage in the 5th triode Q5 is connect by the second capacitor C2, the collector of the 5th triode Q5 passes through third capacitor
C3 connects the base stage in the 4th triode Q4, the emitter ground connection of the 4th triode Q4 and the 5th triode Q5；Second capacitor
C2 is connect by the 7th resistance R7 with the end VCC1, and third capacitor C3 is connect by the 6th resistance R6 with first capacitor C1, the first electricity
Hold C1 to connect with the end VCC1, the base stage of the 4th triode Q4 is connect by the 4th resistance R4 with the end VCC1.
The working principle of the oscillating circuit of the utility model are as follows: at the end VCC and logical VCC1 termination, pass through the seven, the 4th
Resistance R7, R4 provide base bias current to two triodes Q5, Q4 simultaneously.Two triodes are made to enter magnifying state.Although
Two triode models are equally symmetrical.But always there are small differences for circuit parameter, also include two triodes itself, also
It is to say Q5, the conducting degree of Q4 can not be identical, it is assumed that Q4 conducting is quicker, then the voltage of C2 point will drop quicker.This
The base stage that a small difference will be amplified and be fed back to Q4 by Q5 forms chain reaction using the amplification of Q4, makes Q4 full rapidly
With Q5 cut-off.The switch of a connection is equivalent to after Q4 saturation, C2 is discharged by it, and C3 is charged by it.With putting for C2
Electricity, due to there is positive supply VCC1, the base voltage of Q5 is gradually risen, and after C2 reaches 0.7V with R7 point voltage, Q5 is opened
Begin to be connected and enter amplification region, can occur chain reaction at once again in circuit, be saturated Q5 rapidly, Q4 cut-off.This when capacitor
C3 electric discharge, C2 charging.This charge and discharge process can be such that Q4 is saturated again again, and Q5 cut-off so in cycles forms oscillation.
The buzzer drive circuit includes that the collector and oscillating circuit of the second triode Q2, the second triode Q2 connects
Connect, emitter is connect with the base stage of the first triode Q1, the collector of the first triode Q1 with respectively with buzzer BEEP
It is connected with the second triode Q2 base stage, (emitter of Q1 is grounded the first triode, and the other end of the buzzer BEEP connects electricity
Source circuit.The buzzer BEEP is also in parallel with a freewheeling diode.Buzzer BEEP is substantially an inductive element, electricity
Stream is unable to transition, it is therefore necessary to which otherwise tens volts can be generated at the both ends buzzer BEEP by having a freewheeling diode to provide afterflow
Peak voltage, triode may be damaged, and interfere the other parts of entire circuit system.In oscillating circuit work, second
The input current of triode Q2 collector can change, and provide base bias current to the first triode Q1, make the one or three
Pole pipe constantly switches in the case where ending and being saturated two states, and then makes buzzer BEEP that buzzing occur.
Preferably, the power supply is rechargeable battery.
Originally it is other circuit parts of utility model, can clearly finds out from Figure of description, no longer retouch in detail herein
It states.
The above is the embodiments of the present invention, it is noted that for the ordinary skill in the art,
Under the premise of not departing from the utility model principle, various deformation and improvement can also be made, this also should be considered as the utility model
Protection scope.
Claims (10)
1. a kind of pen type testing device, including, oscillating circuit, lighting circuit, buzzer, buzzer drive circuit, power circuit and
Detection probe, it is characterised in that:
The detection probe is connect with oscillating circuit, keeps power supply electric for connecting with cable to be detected, and in cable conducting
Road is oscillating circuit power supply, and generates oscillator signal；
The buzzer drive circuit is connect with oscillating circuit, and is configured to when receiving oscillator signal, and driving buzzer produces
Raw buzzing；
The lighting circuit is connect by a light switch with power circuit, and in light switch closure, the lighting circuit
It is powered.
2. a kind of pen type testing device according to claim 1, it is characterised in that: further include first capacitor (C1), the vibration
It swings circuit to connect by first capacitor (C1) with power circuit, the detection probe is a pair, and is connected to first capacitor
(C1) both ends keep first capacitor (C1) short-circuit when the connection of two detection probes, and power circuit is connected with oscillating circuit.
3. a kind of pen type testing device according to claim 2, it is characterised in that: the oscillating circuit is triode oscillation electricity
Road.
4. a kind of pen type testing device according to claim 3, it is characterised in that: the triode oscillating circuit includes
Two, the closed loop that third capacitor (C2, C3) is constituted, the collector of the 4th triode (Q4) are connect by the second capacitor (C2) the
The collector of the base stage of five triodes (Q5), the 5th triode (Q5) is connect by third capacitor (C3) in the 4th triode (Q4)
The emitter of base stage, the 4th triode (Q4) and the 5th triode (Q5) is grounded；Second capacitor (C2) passes through the 7th resistance
(R7) it is connect with power circuit, third capacitor (C3) is connect by the 6th resistance (R6) and first capacitor (C1) with power circuit.
5. a kind of pen type testing device according to claim 1, it is characterised in that: the lighting circuit includes opening with illumination
Close concatenated LED light and the 9th resistance (R9).
6. a kind of pen type testing device according to claim 1, it is characterised in that: the buzzer drive circuit includes
The collector of two triodes (Q2), the second triode (Q2) is connect with oscillating circuit, the base of emitter and the first triode (Q1)
Pole connection, the collector of first triode (Q1) with connect respectively with buzzer and the second triode (Q2) base stage, first
The emitter of triode (Q1) is grounded, and the other end of the buzzer connects power circuit.
7. a kind of pen type testing device according to claim 6, it is characterised in that: the buzzer also with a freewheeling diode
It is in parallel.
8. a kind of pen type testing device according to claim 1, it is characterised in that: the power circuit include power switch and
Power supply, the power supply are connect with oscillating circuit, lighting circuit, buzzer respectively by power switch.
9. a kind of pen type testing device according to claim 8, it is characterised in that: the power supply is rechargeable battery.
10. a kind of pen type testing device according to claim 1, it is characterised in that: the detection probe passes through pluggable
Plug is connect with oscillating circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821932215.7U CN209327497U (en) | 2018-11-22 | 2018-11-22 | A kind of pen type testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821932215.7U CN209327497U (en) | 2018-11-22 | 2018-11-22 | A kind of pen type testing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209327497U true CN209327497U (en) | 2019-08-30 |
Family
ID=67711163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821932215.7U Active CN209327497U (en) | 2018-11-22 | 2018-11-22 | A kind of pen type testing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209327497U (en) |
-
2018
- 2018-11-22 CN CN201821932215.7U patent/CN209327497U/en active Active
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