Tape Head Demagnetizer Cassettes - Demagnetizer cassettes contain a battery powerd circuit HOME

This model charges up a capacitor to a pre-determined voltage and then dumps it into a demagnetizer oscillator using an SCR. The LED lights when finished:
Circuit Diagram aka Schematic reverse engineered from circuit board
Power to the circuit is activated by a microswitch when the tape head presses on the demagnetizer coils:

I do not gaurantee the accuracy or safety of any information herein.
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Do not experiment with or build any of the above circuits.