CN203872156U - Weak signal detection circuit - Google Patents
Weak signal detection circuit Download PDFInfo
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- CN203872156U CN203872156U CN201420264752.4U CN201420264752U CN203872156U CN 203872156 U CN203872156 U CN 203872156U CN 201420264752 U CN201420264752 U CN 201420264752U CN 203872156 U CN203872156 U CN 203872156U
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- resistance
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- triode
- negative pole
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- 238000001514 detection method Methods 0.000 title abstract 3
- 239000003990 capacitor Substances 0.000 claims description 24
- 238000001914 filtration Methods 0.000 description 4
- 230000006698 induction Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
The utility model discloses a weak signal detection circuit, which comprises a power input end, a direct-current motor, two signal input ends, a forward rotation drive circuit and a reversal rotation drive circuit, wherein the forward rotation drive circuit and the reversal rotation drive circuit are parallelly connected between the power input end and the direct-current motor. The weak signal detection circuit has the advantages that weak signals can be detected.
Description
Technical field
The utility model relates to circuit, especially relates to a kind of testing circuit that small-signal can be detected.
Background technology
In the use of electric equipment products, usually all will use remote control, but receiving circuit can be as too faint in the signal that the interference of long, other signal of distance etc. can receive because of a variety of causes, how identifying small-signal is the problem that Electrical Appliances Designing personnel will face.
Summary of the invention
For overcoming existing shortcoming, the utility model object is to provide a kind of Weak Signal Detecting Circuit that small-signal detected.
The utility model is realized by following technical measures, a kind of Weak Signal Detecting Circuit, comprise antenna, described antenna is connected to a utmost point of capacitor C 1, another utmost point of capacitor C 1 is drawn the negative pole that three lead-in wires connect respectively the positive pole of diode D1, the positive pole of diode D2 and diode D3, and the negative pole of diode D1 is connected to the positive pole of power supply; The negative pole end of diode D2 is drawn three lead-in wires, a lead-in wire is connected to by base stage and the emitter of a RC circuit connecting triode, another two lead-in wires connect resistance R 1 and capacitor C 2 parallel with one another, described resistance R 1 is connected respectively the negative pole of diode D3 and the emitter of triode Q1, the link ground connection of the negative pole of diode D3 and resistance R 1 and capacitor C 2 with capacitor C 2 another links; The collector electrode of the emitter of triode Q1 connects the positive pole of power supply by resistance R 3, the link of the emitter of triode Q1 and resistance R 3 is drawn an output line.
As a kind of optimal way, the resistance of described resistance R 1 is that the resistance of 100K, described resistance R 2 is that the resistance of 100R, described resistance R 3 is 68K, and the value of described capacitor C 1 is that the value of 1nf, described capacitor C 2 is that the value of 2.2nf, described capacitor C 3 is 105.
Operation principle of the present utility model is: 1, when S1 antenna induction is during to faint signal, by C1, C2, D1, D2 and D3 voltage multiplying rectifier, then pass through the filtering of R4 and C3, triode Q1 is communicated with, thereby obtains a low level at output line wet end; If 2 S1 antennas do not sense any signal, triode Q1 cut-off, at a high level signal of output line wet end output.Thereby this utility model is by exporting corresponding signal through RC filtering at output line wet end again after 2 voltage multiplying rectifiers.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the utility model embodiment.
Embodiment
Below in conjunction with embodiment and contrast accompanying drawing the utility model is described in further detail.
A kind of Weak Signal Detecting Circuit, with reference to figure 1, comprise antenna, described antenna is connected to a utmost point of capacitor C 1, another utmost point of capacitor C 1 is drawn the negative pole that three lead-in wires connect respectively the positive pole of diode D1, the positive pole of diode D2 and diode D3, and the negative pole of diode D1 is connected to the positive pole of power supply; The negative pole end of diode D2 is drawn three lead-in wires, a lead-in wire is connected to by base stage and the emitter of a RC circuit connecting triode, another two lead-in wires connect resistance R 1 and capacitor C 2 parallel with one another, described resistance R 1 is connected respectively the negative pole of diode D3 and the emitter of triode Q1, the link ground connection of the negative pole of diode D3 and resistance R 1 and capacitor C 2 with capacitor C 2 another links; The collector electrode of the emitter of triode Q1 connects the positive pole of power supply by resistance R 3, the link of the emitter of triode Q1 and resistance R 3 is drawn an output line wet.
The operation principle of this circuit is: 1, when S1 antenna induction is during to faint signal, by C1, C2, D1, D2 and D3 voltage multiplying rectifier, then pass through the filtering of R4 and C3, triode Q1 is communicated with, thereby obtains a low level at output line wet end; If 2 S1 antennas do not sense any signal, triode Q1 cut-off, at a high level signal of output line wet end output.Thereby this circuit is by exporting corresponding signal through RC filtering at output line wet end again after 2 voltage multiplying rectifiers.
The Weak Signal Detecting Circuit of the present embodiment, please refer to Fig. 1, specifically can also be specifically on the basis of previous technique scheme, the resistance of resistance R 1 is that the resistance of 100K, described resistance R 2 is that the resistance of 100R, described resistance R 3 is 68K, and the value of described capacitor C 1 is that the value of 1nf, described capacitor C 2 is that the value of 2.2nf, described capacitor C 3 is 105.
More than that the utility model Weak Signal Detecting Circuit is set forth; be used for helping to understand the utility model; but execution mode of the present utility model is not restricted to the described embodiments; anyly do not deviate from the change done under the utility model principle, modification, substitute, combination, simplify; all should be equivalent substitute mode, within being included in protection range of the present utility model.
Claims (2)
1. a Weak Signal Detecting Circuit, it is characterized in that: comprise antenna, described antenna is connected to a utmost point of capacitor C 1, another utmost point of capacitor C 1 is drawn the negative pole that three lead-in wires connect respectively the positive pole of diode D1, the positive pole of diode D2 and diode D3, and the negative pole of diode D1 is connected to the positive pole of power supply; The negative pole end of diode D2 is drawn three lead-in wires, a lead-in wire is connected to by base stage and the emitter of a RC circuit connecting triode, another two lead-in wires connect resistance R 1 and capacitor C 2 parallel with one another, described resistance R 1 is connected respectively the negative pole of diode D3 and the emitter of triode Q1, the link ground connection of the negative pole of diode D3 and resistance R 1 and capacitor C 2 with capacitor C 2 another links; The collector electrode of the emitter of triode Q1 connects the positive pole of power supply by resistance R 3, the link of the emitter of triode Q1 and resistance R 3 is drawn an output line.
2. Weak Signal Detecting Circuit according to claim 1, it is characterized in that: the resistance of described resistance R 1 is that the resistance of 100K, described resistance R 2 is that the resistance of 100R, described resistance R 3 is 68K, the value of described capacitor C 1 is that the value of 1nf, described capacitor C 2 is that the value of 2.2nf, described capacitor C 3 is 105.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420264752.4U CN203872156U (en) | 2014-05-22 | 2014-05-22 | Weak signal detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420264752.4U CN203872156U (en) | 2014-05-22 | 2014-05-22 | Weak signal detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203872156U true CN203872156U (en) | 2014-10-08 |
Family
ID=51653075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420264752.4U Expired - Lifetime CN203872156U (en) | 2014-05-22 | 2014-05-22 | Weak signal detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203872156U (en) |
-
2014
- 2014-05-22 CN CN201420264752.4U patent/CN203872156U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 518132 Guangdong province Shenzhen Guangming New District Gongming Street office Yu Tong Tian Liao community with the concept of road nineteen, road 10, Jiuzhou Industrial Park Building 1, floor 802 Patentee after: SHENZHEN F&R TECHNOLOGIES CO.,LTD. Address before: 518000 Guangdong city of Shenzhen province Baoan District Shiyan town Tangtou village Longma industrial city A1 Building 5 floor Patentee before: SHENZHEN F&R ELECTRONICS TECHNOLOGY Co.,Ltd. |
|
| CP03 | Change of name, title or address | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141008 |