CN202494785U - Metal detector - Google Patents
Metal detector Download PDFInfo
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- CN202494785U CN202494785U CN 201220111175 CN201220111175U CN202494785U CN 202494785 U CN202494785 U CN 202494785U CN 201220111175 CN201220111175 CN 201220111175 CN 201220111175 U CN201220111175 U CN 201220111175U CN 202494785 U CN202494785 U CN 202494785U
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Abstract
The utility model discloses a metal detector comprising a power supply circuit, a detection oscillator, a reference oscillator and an audio amplifying circuit. The power supply circuit is respectively connected with a detection oscillation circuit, the reference oscillator and a power supply input terminal of the audio amplifying circuit. A signal output terminal of the detection oscillation circuit is connected with a signal input terminal of a reference oscillation circuit. An audio signal output terminal of the reference oscillation circuit is connected with a signal input terminal of the audio amplifying circuit. The detection oscillation circuit comprises a first transistor, a second transistor, a detection coil, a first capacitor, a second capacitor, a first resistor, a second resistor and a third resistor. Through carrying out optimization design on the circuits of the metal detector, detection sensitivity of the metal detector is raised, anti-interference ability is enhanced, and furthermore, the utility model also has the advantages of small volume, low cost, portability and the like.
Description
Technical field
The utility model relates to a kind of detector, particularly relates to a kind of highly sensitive metal detector.
Background technology
Along with the metal detection continuous advancement in technology; Aspects such as the metal current detector is widely used in mining and metallurgy, seeks treasured, detecting a mine, security protection; Though metal detector is obtained large development in recent years; But mostly the sensitivity that exists of metal detector does not reach, shortcomings such as poor anti jamming capability, deficiency such as metal detector exists also that function is various mostly, complicated circuit, volume are big, be inconvenient to carry.
Summary of the invention
The purpose of the utility model be provide in order to address the above problem that a kind of volume is little, cost is low, highly sensitive, the metal detector that is easy to carry about with one.
The utility model is realized through following technical scheme:
A kind of metal detector; Comprise power circuit, survey oscillator, reference oscillator and audio amplifier circuit; Said power circuit is connected with the power input of said detection oscillatory circuit, reference oscillator and audio amplifier circuit respectively; The signal output part of said detection oscillatory circuit is connected with the signal input part of said reference oscillation circuit; The audio signal output end of the reference oscillation circuit of telling is connected with the signal input part of said audio amplifier circuit; Said detection oscillatory circuit comprises the first transistor, transistor seconds, detecting coil, first electric capacity, second electric capacity, first resistance, second resistance and the 3rd resistance; First end of said first resistance is connected with first end of first end of said first electric capacity, second electric capacity and the base stage of said transistor seconds, the second end ground connection of said first resistance, and second end of said detecting coil is connected with first end of said second resistance respectively; Second end of said second resistance and the base stage of said the first transistor; The collector of said the first transistor is connected with first end of said the 3rd resistance, and the emitter of said the first transistor is connected with the emitter of said transistor seconds, the grounded collector of said transistor seconds.
Further; Said reference oscillator comprises the 3rd transistor, inductor, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 4th resistance and the 5th resistance; The said the 3rd transistorized base stage is connected with first end of said second resistance; The said the 3rd transistorized collector is connected with second end of said the 3rd resistance, and the said the 3rd transistorized base stage is connected with second end of said detecting coil, and the said the 3rd transistorized emitter is connected with first end of said the 4th resistance; The second end ground connection of said the 4th resistance; First end of said inductor is connected with the emitter of said the first transistor and the emitter of transistor seconds respectively, and second end of said inductor is connected with first end of said the 3rd electric capacity, and second end of said the 3rd electric capacity is connected with first end of said the 5th resistance; Second end of said the 5th resistance is connected with first end of said the 4th electric capacity and first end of the 5th electric capacity respectively, the second end ground connection of said the 4th electric capacity.
A nearlyer step ground; Said audio amplifier circuit comprises audio frequency amplification circuit, potentiometer, the 6th electric capacity, the 7th electric capacity and loudspeaker; First end of said potentiometer is connected with second end of said the 5th electric capacity; The second end ground connection of said potentiometer, the sliding end of said potentiometer is connected with first end of said the 6th electric capacity, and second end of said the 6th electric capacity is connected with the signal input part of said audio frequency amplification circuit; The audio signal output end of said audio frequency amplification circuit is connected with first end of said the 7th electric capacity; The earth terminal ground connection of said audio frequency amplification circuit, second end of said the 7th electric capacity is connected with first end of said loudspeaker, the second end ground connection of said loudspeaker.
The beneficial effect of the utility model is:
Circuit through to metal detector is optimized design, and the detection sensitivity of the metal detector after the optimization improves, and antijamming capability strengthens, and in addition, the utility model also has advantages such as volume is little, cost is low, be easy to carry about with one.
Description of drawings
Fig. 1 is the circuit diagram of the utility model.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is done further to specify:
As shown in Figure 1; A kind of metal detector of the utility model; Comprise power circuit, survey oscillator, reference oscillator and audio amplifier circuit; Said power circuit is connected with the power input of said detection oscillatory circuit, reference oscillator and audio amplifier circuit respectively; The signal output part of said detection oscillatory circuit is connected with the signal input part of said reference oscillation circuit, and the audio signal output end of the reference oscillation circuit of telling is connected with the signal input part of said audio amplifier circuit, and said power circuit comprises battery GB, power switch S and the 8th capacitor C 8 and the 9th capacitor C 9.Said detection oscillatory circuit comprises the first transistor VT1, transistor seconds VT2, detecting coil L1, first capacitor C 1, second capacitor C 2, first resistance R 1, second resistance R 2 and the 3rd resistance R 3; First end of said first resistance R 1 is connected with first end of said first capacitor C 1, first end of second capacitor C 2 and the base stage of said transistor seconds VT2; The second end ground connection of said first resistance R 1; Second end of said detecting coil L1 is connected with first end of said second resistance R 2 respectively; Second end of said second resistance R 2 and the base stage of said the first transistor VT1; The collector of said the first transistor VT1 is connected with first end of said the 3rd resistance R 3, and the emitter of said the first transistor VT1 is connected with the emitter of said transistor seconds VT2, the grounded collector of said transistor seconds VT2.
Said reference oscillator comprises the 3rd transistor VT3, inductor L2, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5, the 4th resistance R 4 and the 5th resistance R 5; The base stage of said the 3rd transistor VT3 is connected with first end of said second resistance R 2; The collector of said the 3rd transistor VT3 is connected with second end of said the 3rd resistance R 3; The base stage of said the 3rd transistor VT3 is connected with second end of said detecting coil L1; The emitter of said the 3rd transistor VT3 is connected with first end of said the 4th resistance R 4; The second end ground connection of said the 4th resistance R 4; First end of said inductor L2 is connected with the emitter of said the first transistor VT1 and the emitter of transistor seconds VT2 respectively, and second end of said inductor L2 is connected with first end of said the 3rd capacitor C 3, and second end of said the 3rd capacitor C 3 is connected with first end of said the 5th resistance R 5; Second end of said the 5th resistance R 5 is connected the second end ground connection of said the 4th capacitor C 4 with first end of said the 4th capacitor C 4 and first end of the 5th capacitor C 5 respectively.
Said audio amplifier circuit comprises audio frequency amplification circuit IC, potentiometer RP, the 6th capacitor C 6, the 7th capacitor C 7 and loudspeaker BL; First end of said potentiometer RP is connected with second end of said the 5th capacitor C 5; The second end ground connection of said potentiometer RP; The sliding end of said potentiometer RP is connected with first end of said the 6th capacitor C 6; Second end of said the 6th capacitor C 6 is connected with the signal input part of said audio frequency amplification circuit IC, and the audio signal output end of said audio frequency amplification circuit IC is connected with first end of said the 7th capacitor C 7, the earth terminal ground connection of said audio frequency amplification circuit IC; Second end of said the 7th capacitor C 7 is connected with first end of said loudspeaker BL, the second end ground connection of said loudspeaker BL.In the present embodiment, said audio frequency amplification circuit is a LM386 type audio frequency amplification circuit.
The principle of work of the utility model: after the detecting device energising; When detecting coil L1 does not detect metal object; The frequency of operation of surveying oscillator is identical with the frequency of operation of reference oscillator, the 3rd transistorized emitter absence of audio signal output, and loudspeaker is not sounded.Detect the metal object of land burial as detecting coil L1 after; The inductance value of detecting coil L1 can change; The frequency of operation of surveying oscillator changes thereupon, and the emitter of the 3rd transistor VT3 is output audio signal, with signal through the audio frequency amplification circuit send out big after; Drive the loudspeaker sounding, the prompting user detects metallics.
Claims (3)
1. metal detector; It is characterized in that: comprise power circuit, survey oscillator, reference oscillator and audio amplifier circuit; Said power circuit is connected with the power input of said detection oscillatory circuit, reference oscillator and audio amplifier circuit respectively; The signal output part of said detection oscillatory circuit is connected with the signal input part of said reference oscillation circuit; The audio signal output end of the reference oscillation circuit of telling is connected with the signal input part of said audio amplifier circuit; Said detection oscillatory circuit comprises the first transistor, transistor seconds, detecting coil, first electric capacity, second electric capacity, first resistance, second resistance and the 3rd resistance; First end of said first resistance is connected with first end of first end of said first electric capacity, second electric capacity and the base stage of said transistor seconds, the second end ground connection of said first resistance, and second end of said detecting coil is connected with first end of said second resistance respectively; Second end of said second resistance and the base stage of said the first transistor; The collector of said the first transistor is connected with first end of said the 3rd resistance, and the emitter of said the first transistor is connected with the emitter of said transistor seconds, the grounded collector of said transistor seconds.
2. metal detector according to claim 1; It is characterized in that: said reference oscillator comprises the 3rd transistor, inductor, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 4th resistance and the 5th resistance; The said the 3rd transistorized base stage is connected with first end of said second resistance; The said the 3rd transistorized collector is connected with second end of said the 3rd resistance; The said the 3rd transistorized base stage is connected with second end of said detecting coil; The said the 3rd transistorized emitter is connected with first end of said the 4th resistance, the second end ground connection of said the 4th resistance, and first end of said inductor is connected with the emitter of said the first transistor and the emitter of transistor seconds respectively; Second end of said inductor is connected with first end of said the 3rd electric capacity; Second end of said the 3rd electric capacity is connected with first end of said the 5th resistance, and second end of said the 5th resistance is connected with first end of said the 4th electric capacity and first end of the 5th electric capacity respectively, the second end ground connection of said the 4th electric capacity.
3. metal detector according to claim 1 and 2; It is characterized in that: said audio amplifier circuit comprises audio frequency amplification circuit, potentiometer, the 6th electric capacity, the 7th electric capacity and loudspeaker; First end of said potentiometer is connected with second end of said the 5th electric capacity; The second end ground connection of said potentiometer, the sliding end of said potentiometer is connected with first end of said the 6th electric capacity, and second end of said the 6th electric capacity is connected with the signal input part of said audio frequency amplification circuit; The audio signal output end of said audio frequency amplification circuit is connected with first end of said the 7th electric capacity; The earth terminal ground connection of said audio frequency amplification circuit, second end of said the 7th electric capacity is connected with first end of said loudspeaker, the second end ground connection of said loudspeaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220111175 CN202494785U (en) | 2012-03-22 | 2012-03-22 | Metal detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220111175 CN202494785U (en) | 2012-03-22 | 2012-03-22 | Metal detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202494785U true CN202494785U (en) | 2012-10-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220111175 Expired - Fee Related CN202494785U (en) | 2012-03-22 | 2012-03-22 | Metal detector |
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| Country | Link |
|---|---|
| CN (1) | CN202494785U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297805A (en) * | 2014-11-07 | 2015-01-21 | 吴建堂 | Metal detection device |
| CN105137496A (en) * | 2015-09-18 | 2015-12-09 | 芜湖市恒峰科技有限公司 | Metal detecting device for industrial mine |
| CN105353417A (en) * | 2015-09-28 | 2016-02-24 | 芜湖市恒峰科技有限公司 | Low-power detection circuit of underground metal pipeline |
| CN105549111A (en) * | 2015-12-17 | 2016-05-04 | 无锡信大气象传感网科技有限公司 | Handheld metal locator based on pressure induction |
| CN105607142A (en) * | 2015-12-17 | 2016-05-25 | 无锡信大气象传感网科技有限公司 | Differential frequency processing-based handheld metal detector |
-
2012
- 2012-03-22 CN CN 201220111175 patent/CN202494785U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297805A (en) * | 2014-11-07 | 2015-01-21 | 吴建堂 | Metal detection device |
| CN104297805B (en) * | 2014-11-07 | 2017-03-29 | 杨睿智 | Metal detecting device |
| CN105137496A (en) * | 2015-09-18 | 2015-12-09 | 芜湖市恒峰科技有限公司 | Metal detecting device for industrial mine |
| CN105353417A (en) * | 2015-09-28 | 2016-02-24 | 芜湖市恒峰科技有限公司 | Low-power detection circuit of underground metal pipeline |
| CN105549111A (en) * | 2015-12-17 | 2016-05-04 | 无锡信大气象传感网科技有限公司 | Handheld metal locator based on pressure induction |
| CN105607142A (en) * | 2015-12-17 | 2016-05-25 | 无锡信大气象传感网科技有限公司 | Differential frequency processing-based handheld metal detector |
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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: 20121017 Termination date: 20130322 |