CN201589827U - Detector for circuit breakpoint - Google Patents
Detector for circuit breakpoint Download PDFInfo
- Publication number
- CN201589827U CN201589827U CN2009202538066U CN200920253806U CN201589827U CN 201589827 U CN201589827 U CN 201589827U CN 2009202538066 U CN2009202538066 U CN 2009202538066U CN 200920253806 U CN200920253806 U CN 200920253806U CN 201589827 U CN201589827 U CN 201589827U
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- Prior art keywords
- circuit
- capacitor
- breakpoint
- resistor
- operational amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 239000000523 sample Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000005476 soldering Methods 0.000 abstract 1
- 230000005236 sound signal Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
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- Burglar Alarm Systems (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model discloses a detector for circuit breakpoint, which comprises a shell and a circuit installed in the shell, and pertains to the field of detection of electric products. The circuit comprises a breaking-point detection circuit, a low-pass filter circuit, a power amplifier circuit and a sounding circuit which are serially connected in sequence, wherein the breaking-point detection circuit comprises an inductance coil L, a capacitor C1, a resistor R1 and a computing amplifier D1; the low-pass filter circuit comprises a capacitor C2, a capacitor C4, a capacitor C5, an inductor LGX, a computing amplifier D2, a resistor R3 and an adjustable resistor RP; the power amplifier circuit comprises a capacitor C3, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a resistor R2, a resistor R4, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a light-emitting diode VD, a computing amplifier D3 and a computing amplifier D4; and the sounding circuit is formed by connecting a speaker M1 and a speaker M2 in parallel. A circuit breaking point is detected, filtered and amplified by the inductance coil L and then converted into a sound signal. The detector for circuit breakpoint can help an electric appliance maintenance man detect circuit failure of electric appliance products such as insufficient soldering, breakage of printing plate, poor contact inside parts and the like.
Description
Affiliated technical field
The utility model relates to a kind of pick-up unit of circuit, is specifically related to a kind of detecting device of circuit breakpoint, belongs to the electric equipment products detection range.
Background technology
Run into some as faults such as rosin joint, forme fracture, the inner loose contacts of part through regular meeting in electrical maintenance, the maintenance personal keeps in repair by rule of thumb.Some fault naked eyes as can be seen, the energy and time that some fault but will cost a lot of money also may not necessarily find sometimes.
Summary of the invention
The purpose of this utility model is to provide a kind of checkout equipment that can find the circuit breakpoint accurately, fast.
The checkout equipment that the purpose of this utility model is achieved in that this circuit breakpoint is made up of shell and the circuit installed in the enclosure, and this circuit is made up of breakpoint testing circuit 1, low-pass filter circuit 2, power amplification circuit 3, the phonation circuit 4 of connecting successively; Described breakpoint testing circuit 1 is made up of telefault L, capacitor C 1, resistance R 1 and operational amplifier D1, is used to detect the position of breakpoint, and wherein, coil L is the contact sonde of circuit breakpoint, and C1 is anti-self-excitation capacitance; Described low-pass filter circuit 2 is by capacitor C 2, C4, C5, inductance L GX, operational amplifier D2, resistance R 3 and adjustable resistance RP form, be used for the probe signal that detects is carried out filtering and waveform amplification, wherein, the operational amplifier D1 of operational amplifier D2 and testing circuit 1 constitutes sign-changing amplifier, and adjustable resistance RP is used for volume to be regulated, and inductance L GX is used for filtering; Described power amplification circuit 3 is by capacitor C 3, C6, C7, C8, C9, resistance R 2, R4, R5, R6, R7, light emitting diode VD and operational amplifier D3, D4 form, and are used for the signal after handling through low-pass filter circuit is done further to amplify, and supply with phonation circuit; Wherein, operational amplifier D3, D4 parallel connection are coupled to the form of follower, and R5, C7, R6, C6 have formed a bleeder circuit, are used for providing bias voltage to amp.ins at different levels, and VD, R7 form the energising indication; Described phonation circuit 4 is composed in parallel by two loudspeaker M1, M2, is used for electromagnetic wave signal detected from breakpoint and through amplifying is converted to sound, listens to for the testing staff.
The principle of work and the testing process of the checkout equipment of this circuit breakpoint are: when the circuit that breakpoint is arranged is detected, under the situation of electrical equipment energising, parts are along with the testing staff's stirs, the touching breakpoint, can occur off and on continuously to extraradial electromagnetic wave, this electromagnetic signal coils L detects, D1 amplifies, through capacitor C 4, C5, the low-pass filter that inductance L cx forms enters operational amplifier D2, D1 and D2 form sign-changing amplifier detection signal are amplified, the signal of this output passes through power amplification more then, and this moment, the testing staff just can detect breakpoint by the loudspeaker of phonation circuit.
Description of drawings
Fig. 1 is the circuit block diagram of this detecting device;
Fig. 2 is the circuit structure diagram of this detecting device.
Each Reference numeral is among the figure: 1, breakpoint testing circuit, 2, low-pass filter circuit, 3, power amplification circuit, 4, phonation circuit.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing 2 and embodiment, but embodiment is not to qualification of the present utility model.
Embodiment, referring to Fig. 2, this detecting device is made up of breakpoint testing circuit, low-pass filter circuit, power amplification circuit and phonation circuit, circuit core is to adopt a LM324 integrated circuit, it comprises operational amplifier D1, D2, D3, D4, and wherein, D1, D2 constitute sign-changing amplifier; 4 pin of LM324 connect power supply ground, and 11 pin connect power cathode, and adjustable resistance adopts rheochord, and loudspeaker adopts earphone.Detected break point signal is detected by the coil L of breakpoint testing circuit, and D1 amplifies, and by capacitor C 4, C5, the low-pass filter that inductance L cx forms enters D2 and amplifies in the process low-pass filter circuit, and adjustable resistance RP is used for volume to be regulated.The voltage of low-pass filter circuit output amplifies through power amplification circuit again, because LM324 is not a power amplification circuit, output power is very little, so D3, D4 are carried out parallel connection outside, can effectively improve the output power of circuit.These two amplifiers all have been connected into the form of follower, certain current gain is arranged, very low output impedance and earphone coupling is arranged, because amplifier will be used positive-negative power usually, so having formed a bleeder circuit, R5, C7, R6, C6 bias voltage is provided for amp.ins at different levels, C1 is anti-self-excitation capacitance, and VD, R7 form the energising indication, and VD is a circuit operate as normal pilot lamp; Switch S is that standby and normal mode of operation are switched, and wherein the S closure is an operate as normal, and S is broken as holding state.Convert voice signal through the power amplification circuit amplifying signal at phonation circuit.
Connect circuit by schematic diagram, circuit is connected the 9V power supply, put on earphone, adjust volume potentiometer, knock the wiring board detected circuit then gently, gradually mobile probe (being coil L), make cackle the most clear, stopping in the maximum position place, carefully detects below probe, and breakpoint just can find.
Claims (1)
1. circuit breakpoint detecting device is made up of shell and installation circuit in the enclosure, and it is characterized in that: circuit is made up of breakpoint testing circuit (1), low-pass filter circuit (2), power amplification circuit (3), the phonation circuit (4) of series connection successively; Described breakpoint testing circuit (1) is made up of telefault L, capacitor C 1, resistance R 1 and operational amplifier D1, is used to detect the position of breakpoint, and wherein, coil L is the contact sonde of circuit breakpoint, and C1 is anti-self-excitation capacitance; Described low-pass filter circuit (2) is made up of capacitor C 2, C4, C5, inductance L GX, operational amplifier D2, resistance R 3 and adjustable resistance RP, be used for the probe signal that detects is carried out filtering and waveform amplification, wherein, the operational amplifier D1 of operational amplifier D2 and testing circuit 1 constitutes sign-changing amplifier, adjustable resistance RP is used for volume to be regulated, and inductance L GX is used for filtering; Described power amplification circuit (3) is made up of capacitor C 3, C6, C7, C8, C9, resistance R 2, R4, R5, R6, R7, light emitting diode VD and operational amplifier D3, D4, be used for the signal after handling through low-pass filter circuit is done further to amplify, supply with phonation circuit; Wherein, operational amplifier D3, D4 parallel connection are coupled to the form of follower, and R5, C7, R6, C6 have formed a bleeder circuit, are used for providing bias voltage to amp.ins at different levels, and VD, R7 form the energising indication; Described phonation circuit (4) is composed in parallel by two loudspeaker M1, M2, is used for electromagnetic wave detected from breakpoint and through amplifying is converted to voice signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202538066U CN201589827U (en) | 2009-12-02 | 2009-12-02 | Detector for circuit breakpoint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202538066U CN201589827U (en) | 2009-12-02 | 2009-12-02 | Detector for circuit breakpoint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201589827U true CN201589827U (en) | 2010-09-22 |
Family
ID=42749614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202538066U Expired - Fee Related CN201589827U (en) | 2009-12-02 | 2009-12-02 | Detector for circuit breakpoint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201589827U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106872853A (en) * | 2017-01-19 | 2017-06-20 | 黄超发 | A kind of wall intraoral illumination concealed wire broken string device for searching |
| CN110300201A (en) * | 2019-07-29 | 2019-10-01 | Oppo广东移动通信有限公司 | Terminal device |
-
2009
- 2009-12-02 CN CN2009202538066U patent/CN201589827U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106872853A (en) * | 2017-01-19 | 2017-06-20 | 黄超发 | A kind of wall intraoral illumination concealed wire broken string device for searching |
| CN110300201A (en) * | 2019-07-29 | 2019-10-01 | Oppo广东移动通信有限公司 | Terminal device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100922 Termination date: 20131202 |