CN205665413U - Simple and easy metal detector circuit - Google Patents
Simple and easy metal detector circuit Download PDFInfo
- Publication number
- CN205665413U CN205665413U CN201620520828.4U CN201620520828U CN205665413U CN 205665413 U CN205665413 U CN 205665413U CN 201620520828 U CN201620520828 U CN 201620520828U CN 205665413 U CN205665413 U CN 205665413U
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- transistor
- capacitor
- resistor
- detector circuit
- buzzer
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Abstract
The utility model relates to a metal detector, more specifically say and relate to a simple and easy metal detector circuit, including high -frequency oscillating circuits, detection circuitry and audio frequency oscillation circuit, high -frequency oscillating circuits comprises transistor Q1, search coil L1 and L2, condenser C1, C2 and C3, resistor R1 and slide resistance ware W, detection circuitry comprises transistor Q2 and Q3, resistor R2 and condenser C4, audio frequency oscillation circuit comprises transistor Q4 and Q5, resistor R3 and R4, condenser C5 and C6 and bee calling organ, the utility model relates to a simple and easy metal detector circuit, its circuit structure reasonable in design, low power dissipation, convenient operation and make low cost, can extensively be applicable to on one's body metal product of recreation amusement, safety check, seeking, metal rubbish clear away and the plank in remain the detection etc. Of iron nail.
Description
Technical field
This utility model relates to metal detector, more specifically to a kind of simple wire detector circuit.
Background technology
Metal detector is designed to detect people or the metal object of thing vivo carrying, is widely used in commercial production, peace
The fields such as inspection, amusement.It can detect the metal that people is carried in carrying with parcel, luggage, mail, fabric etc., as
Pocket knife, pen even can detect cigarette case (there is aluminum thin film inside).It is easy to operation, easy to use.But it is existing
Technical scheme all uses the dsp chip of high cost and the digitization program of single-chip microcomputer, and its cost is high, and circuit is complicated.
Utility model content
This utility model provides a kind of low cost, circuit simple, is widely used in the fields such as commercial production, safety check, amusement
Simple wire detector circuit.
Technical solution adopted in the utility model: simple wire detector circuit, including high-frequency oscillating circuits, detection electricity
Road and audio oscillator circuit.Described high-frequency oscillating circuits is by transistor Q1, search coil L1 and L2, capacitor C1, C2 and C3, electricity
Resistance device R1 and slide resistor W composition, the base stage of described transistor Q1 is connected in parallel to resistor R1 and capacitor C2, described
Capacitor C2 connects has the emitter stage connection of search coil L2, described transistor Q1 to have slide resistor W, described slide resistor
W connects power cathode, and the colelctor electrode of described transistor Q1 is connected in parallel to search coil L1 and capacitor C3；Described detection electricity
Route transistor Q2 and Q3, resistor R2 and capacitor C4 composition, the base stage of described transistor Q2 is connected in parallel to transistor Q1
Colelctor electrode, search coil L1 and capacitor C3, the emitter stage of described transistor Q2 is connected in parallel to resistor R2, capacitor
C4 and the base stage of transistor Q3, the colelctor electrode of described transistor Q2 connects positive source, and the base stage parallel connection of described transistor Q3 is even
Being connected to resistor R2, capacitor C4 and the emitter stage of transistor Q2, the colelctor electrode of described transistor Q3 connects power supply, described crystalline substance
The emitter stage of body pipe Q3 also connects the emitter stage of transistor Q4 of audio oscillator circuit part, buzzer and capacitor C6；Institute
State audio oscillator circuit to be made up of transistor Q4 and Q5, resistor R3 and R4, capacitor C5 and C6 and buzzer, described crystal
The colelctor electrode of pipe Q4 connects the base stage of transistor Q5, and base stage the connection of described transistor Q4 have resistor R3 and capacitor C5,
Emitter stage the connection of described transistor Q4 have the colelctor electrode of transistor Q3, buzzer and capacitor C6, described capacitor C5
Connecting resistor R4, the emitter stage power cathode of described transistor Q5, colelctor electrode the connection of described transistor Q5 have resistor
R4 and buzzer, described capacitor C6 connects buzzer.
Further as this programme optimizes, slide resistor described in this utility model one simple wire detector circuit
W selects small-sized potentiometer or rheostat.
As the further optimization of this programme, resistor R1 described in this utility model one simple wire detector circuit～
R4 all selects 1/4W metal film resistor potentiometer.
Further as this programme optimizes, capacitor C1 choosing described in this utility model one simple wire detector circuit
With high frequency ceramic capacitor, capacitor C2～C5 all selects dacron terylene condenser or monolithic capacitor, and capacitor C6 selects pressure voltage
Aluminium electrolutic capacitor for 10Y.
As the further optimization of this programme, transistor Q1 described in this utility model one simple wire detector circuit,
Q5 all selects the silicon NPN transistor that current amplification factor is more than 100；Transistor Q2, Q3, Q4 select current amplification factor to be more than
The PNP transistor of 100.
Further as this programme optimizes, search coil described in this utility model one simple wire detector circuit
L1, L2 use the copper sheet wire on printed panel to form inductance.
Further as this programme optimizes, buzzer SP choosing described in this utility model one simple wire detector circuit
With the passive buzzer of electromagnetic type.
This utility model has a following beneficial effect:
This utility model one simple wire detector circuit, its circuit structure design is reasonable, low in energy consumption, easy to operate and
Cost of manufacture is cheap, is widely portable to the removing of the metallic article with Entertainment, safety inspection, seeking, metal garbage
And plank remains the detection etc. of iron nail.
Accompanying drawing explanation
Fig. 1 is the control circuit structure principle chart of this utility model figure.
Detailed description of the invention
A kind of low cost, circuit as shown in Figure 1 are simple, are widely used in the letter in the fields such as commercial production, safety check, amusement
Easily metal detector circuit, including high-frequency oscillating circuits, testing circuit and audio oscillator circuit.
Described high-frequency oscillating circuits by transistor Q1, search coil L1 and L2, capacitor C1, C2 and C3, resistor R1 and
Slide resistor W forms, and the base stage of described transistor Q1 is connected in parallel to resistor R1 and capacitor C2, described capacitor C2
Connect and have the emitter stage connection of search coil L2, described transistor Q1 to have slide resistor W, described slide resistor W to connect
Ground, the colelctor electrode of described transistor Q1 is connected in parallel to search coil L1 and capacitor C3.
Described testing circuit is made up of transistor Q2 and Q3, resistor R2 and capacitor C4, the base stage of described transistor Q2
Being connected in parallel to the colelctor electrode of transistor Q1, search coil L1 and capacitor C3, the emitter stage parallel connection of described transistor Q2 is even
Being connected to resistor R2, capacitor C4 and the base stage of transistor Q3, the colelctor electrode of described transistor Q2 connects positive source, described crystalline substance
The base stage of body pipe Q3 is connected in parallel to resistor R2, capacitor C4 and the emitter stage of transistor Q2, the collection of described transistor Q3
Electrode connects power supply, and the emitter stage of described transistor Q3 also connects the emitter stage of transistor Q4 of audio oscillator circuit part, honeybee
Ring device and capacitor C6.
Described audio oscillator circuit is by transistor Q4 and Q5, resistor R3 and R4, capacitor C5 and C6 and buzzer group
Becoming, the colelctor electrode of described transistor Q4 connects the base stage of transistor Q5, and base stage the connection of described transistor Q4 have resistor R3
Emitter stage connection with capacitor C5, described transistor Q4 have the colelctor electrode of transistor Q3, buzzer and capacitor C6, institute
Stating capacitor C5 and connect resistor R4, the emitter stage power cathode of described transistor Q5, the colelctor electrode of described transistor Q5 also connects
Being connected to resistor R4 and buzzer, described capacitor C6 connects buzzer.
Install in circuit after each element, regulation slide resistor W to the most not sounding (in the case of metal)
With printed panel antenna near metal, now should sounding, away from stopping sounding after metal, if away from not stopping sounding,
Slide resistor W counterclockwise should be adjusted and little by little try again, until meeting the requirements.Suitable change capacitor C5's
Capacity can change the frequency of sounding.
The control principle of this circuit is: transistor Q1, search coil L1 and L2, capacitor C2 and C3, resistor R1, slip
Resistor W forms high-frequency oscillating circuits, regulates slide resistor W, thus it is possible to vary oscillator stage gain, makes agitator be in critical shaking
Swing state, say, that just make agitator starting of oscillation.
Transistor Q2 and Q3, resistor R2 and capacitor C4 form testing circuit, and during circuit normal oscillation, oscillating voltage is handed over
When stream voltage is more than 0.6V, transistor Q2 will turn on capacitor C4 discharge short at negative half period, and result causes transistor Q3
Cut-off；When search coil L1 is near metal object, vortex flow can be produced in metallic conductor, make the energy in oscillation circuit damage
Consumption increases, and positive feedback weakens, and is in the agitator oscillations of critical state, be even unable to maintain that the minimum energy needed for vibration and
Failure of oscillation, makes transistor Q2 end, and resistor R2 charges to capacitor C4, and transistor Q3 turns on, to transistor Q4, transistor Q5 group
The audio oscillator circuit powered operation become, promotes buzzer sounding.According to sound with or without, it is possible to judge search coil be presented herein below
No have metal object.
Certainly described above is not limitation of the utility model, and this utility model is also not limited to the example above, this skill
Change that the those of ordinary skill in art field is made in essential scope of the present utility model, retrofit, add or replace, also belong to
In protection domain of the present utility model.
Claims (7)
1. a simple wire detector circuit, it is characterised in that: include high-frequency oscillating circuits, testing circuit and audio oscillation electricity
Road, described high-frequency oscillating circuits is by transistor Q1, search coil L1 and L2, capacitor C1, C2 and C3, resistor R1 and the electricity that slides
Resistance device W composition, the base stage of described transistor Q1 is connected in parallel to resistor R1 and capacitor C2, described capacitor C2 connection to be had
The emitter stage of search coil L2, described transistor Q1 connects has slide resistor W, described slide resistor W to connect power cathode,
The colelctor electrode of described transistor Q1 is connected in parallel to search coil L1 and capacitor C3；Described testing circuit by transistor Q2 and
Q3, resistor R2 and capacitor C4 composition, the base stage of described transistor Q2 is connected in parallel to the colelctor electrode of transistor Q1, detection line
Circle L1 and capacitor C3, the emitter stage of described transistor Q2 is connected in parallel to resistor R2, capacitor C4 and transistor Q3
Base stage, the colelctor electrode of described transistor Q2 connects positive source, and the base stage of described transistor Q3 is connected in parallel to resistor R2, electricity
Container C4 and the emitter stage of transistor Q2, the colelctor electrode of described transistor Q3 connects power supply, the emitter stage of described transistor Q3
And connect the emitter stage of transistor Q4 of audio oscillator circuit part, buzzer and capacitor C6；Described audio oscillator circuit
Being made up of transistor Q4 and Q5, resistor R3 and R4, capacitor C5 and C6 and buzzer, the colelctor electrode of described transistor Q4 is even
Connecing the base stage of transistor Q5, base stage the connection of described transistor Q4 have resistor R3 and capacitor C5, described transistor Q4's
Emitter stage connection have the colelctor electrode of transistor Q3, buzzer and capacitor C6, and described capacitor C5 connects resistor R4, institute
Stating the emitter stage power cathode of transistor Q5, colelctor electrode the connection of described transistor Q5 have resistor R4 and buzzer, described
Capacitor C6 connects buzzer.
A kind of simple wire detector circuit the most according to claim 1, it is characterised in that: described slide resistor W selects
With small-sized potentiometer or rheostat.
A kind of simple wire detector circuit the most according to claim 1, it is characterised in that: described resistor R1～R4 is equal
Select 1/4W metal film resistor potentiometer.
A kind of simple wire detector circuit the most according to claim 1, it is characterised in that: described capacitor C1 selects height
Frequently ceramic capacitor, capacitor C2～C5 all selects dacron terylene condenser or monolithic capacitor, and capacitor C6 selects pressure voltage to be 10Y
Aluminium electrolutic capacitor.
A kind of simple wire detector circuit the most according to claim 1, it is characterised in that: described transistor Q1, Q5 are equal
Select the current amplification factor silicon NPN transistor more than 100；Transistor Q2, Q3, Q4 select current amplification factor to be more than 100
PNP transistor.
A kind of simple wire detector circuit the most according to claim 1, it is characterised in that: described search coil L1, L2
The copper sheet wire on printed panel is used to form inductance.
A kind of simple wire detector circuit the most according to claim 1, it is characterised in that: described buzzer SP selects electricity
The passive buzzer of magnetic-type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620520828.4U CN205665413U (en) | 2016-05-30 | 2016-05-30 | Simple and easy metal detector circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620520828.4U CN205665413U (en) | 2016-05-30 | 2016-05-30 | Simple and easy metal detector circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205665413U true CN205665413U (en) | 2016-10-26 |
Family
ID=57158128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620520828.4U Expired - Fee Related CN205665413U (en) | 2016-05-30 | 2016-05-30 | Simple and easy metal detector circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205665413U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107843932A (en) * | 2016-09-17 | 2018-03-27 | 长沙闽壹湖电子科技有限责任公司 | A kind of safety check potable metal detector |
-
2016
- 2016-05-30 CN CN201620520828.4U patent/CN205665413U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107843932A (en) * | 2016-09-17 | 2018-03-27 | 长沙闽壹湖电子科技有限责任公司 | A kind of safety check potable metal detector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161026 Termination date: 20170530 |