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14-04-2017, 08:49 AM

i need the metal detectorcircuit diagram working

jaseela123d · 17-04-2017, 11:35 AM

[Image: metal_detector.png?resize=300%2C140]

This circuit is very useful for the safety check. Metal detectors available on the market are quite expensive.

This metal detector can be used to detect metallic objects of slightly large size. He used a detection coil. This coil should be kept close to metallic objects for detection. The entrance to the circuit is a week colpitt's R.F. Oscillator Range. The detection coil forms parts of the tuned oscillator.

When the coil approaches a metal object, a magnetic energy is observed and the oscillator does not work. Then the final transistor is driven and the buzzer is activated. Use a 9-volt battery. After connecting the battery, adjust the preset circuit of 4.7k, simply stop.

LIST OF PARTS:-

RESISTANCE

R1, R4 - 56K

R2-3K3

R3 - 22K

R5 - 2K7

R6 = 2K2

R7, R9-680E

R8 - 15K

P1 - 5K 3386 Trim

CONDENSERS

C1, C6 - .1PF (104) 100 KPF

C2-1KPF (102) .001PF

C3 - 220PF

C4 - 270PF / 100V

C5-12KPF / 100V (.012 / 25V)

C7 - 100 / 25V

Transistors

Q1,2,3,4 - BC 547 PH

DIODE

D1,2,3,4 - IN 4148

MISCELLANEOUS

LED1 - 5MM red LED

COIL1 - Metal Detector Coil

Buzzer - VK 27 CT (S)

Supply - 9v Snapper

PCB - PCB VK 557

20-11-2017, 12:11 PM

Hi, I got a VK 557 metal detector and did the connections as specified, but as soon as the battery is connect the LED glows and the buzzer starts buzzing, not stopping even if there is no metal neary by and there is no differnce in buzzer sound if I try to keep a metal object. Please help

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