This immobilizer circuit for vehicles was found in a 80’s Hands On Electronics. The circuit shortens the platinum to prevent its operation and thus the operation of the engine when started.
This 40-second timer uses common components. The output can be used to excite a power stage. With...
This is the circuit for the HM-10ª, an instrument sold by Heathkit. The circuit is from a Radio...
With modifications this circuit can even be transformed into a home communications system using...