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.
In the figure we have an interesting protection bridge against power polarity inversion of a...
This amplifier was found in an old publication of 1990. With the changes, it may still be...
Obtained from an English publication, this circuit actually needs a current limiting resistor,...