Description
Simple 5CM Metal Detector Test Kit DIY Solder Training Kit PCB Metal Detector Adjustable Sensitivity with Alarm Buzzer
Product Description
Round metal detector; Can detect metal within 5cm Adjustable sensitivity Joints are more secure with power switch Square metal detector Can detect metal within 5cm Adjustable sensitivity
Specification
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item
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value
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Product name
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Round/Square Simple Metal Detector Electronics Kit
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Dimensions
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61*86MM61*65MM
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Circuit board material
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Double-sided thickness 1.6mm FR-4 sheet
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Installation Instructions
Circuit schematic
Q1, L1, L2, C2, C3, R1, W form a high-frequency oscillation circuit, and by adjusting the potentiometer W, the gain of the oscillation stage can be changed to make the oscillator in a critical oscillation state, that is to say, it just starts the oscillator. Q2 and Q3 form a detection circuit. When the oscillating voltage AC voltage exceeds 0.6V when the circuit oscillates normally, Q2 will be turned on in the negative half cycle to short-circuit C4, resulting in Q3 being turned off; when the detection coil L1 is close to a metal object, it will be in the metal Eddy current is generated in the conductor, which increases the energy loss in the oscillation circuit, weakens the positive feedback, and weakens the oscillation of the vibrator in the critical state, and even cannot maintain the minimum energy required by the vibrator and stops the vibration, so that Q2 is turned off, and R2 gives C4 is charged, Q3 is turned on, and the buzzer is pushed to sound. According to the presence or absence of sound, it can be determined whether there is a metal object under the detection coil.
Product details
1. The PCB board. There are silk screen logos of various components printed on it, please solder according to the silk screen logos; 2. The resistance is not divided into directions, but there are different resistance values, please pay attention to distinguish it when welding; 3. Electrolytic capacitors are divided into positive and negative poles, the long feet are positive (+), and the short feet are negative (-). 4. When connecting the power cord to the terminal block, pay attention to distinguish the positive and negative poles, and do not connect them in reverse.
Details Images