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

PC Printer Port Controls I-V Curve Tracer
Solar Charge Controller
Proximity-sensor
How To Keep Your Radio On When You Start Your Car
Inverter 12V DC to 240V DC circuit diagram
vhf dip meter
Mentality of designing of electric fan of infrared remote-control command
quad power supply for hybrid amplifier
Jogging Timers
Build a 5A H-bridge Motor driver! Old version
01 buick lesabre
The SDR-1000
Direction Sensitive Light Barrier
Light emitting diode LED displays the basic structure of the driving circuit



Top