Permanent Magnet Detector


Posted on Oct 22, 2012

In this circuit, oscillator Ql runs at about 15 kHz and feeds mixer Ul. Ul has an internal oscillator that runs a


Permanent Magnet Detector
Click here to download the full size of the above Circuit.

t around 15 kHz. CI5 is used to zero-beat both oscillators. When a magnet is brought near Ll or L2, the magnetic field shifts the permeability of their respective cases. This changes the oscillator frequency, and the audio note is passed through filter L3, C16, and C10/R7 to amplifier Q2, There the audio is amplified and drives meter Ml via rectifiers Dl and D2.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

5W Chinese PLL FM Transmitter With LCD Printed Circuit Board (PCB)
Digital Entry Lock Circuit
Arduino Light Sensors
Current source not working in AD7792
Magnetohydrodynamics
Wireless Stereo FM Transmitter BA1404
filtering noisy power signal
led lights using analog flip flop circuit diagram
Car security system design based on PIC microcontroller and GPS tracking
Electronic Ballast circuit diagram



Top