This circuit for car engine spot adjustment was found in an 80's Radio Electronics. The circuit makes use of a xenon lamp and the pulse transformer must have a turn ratio of 1:50.
When the temperature rises above the value adjusted by P1 the relay triggers on. The rated voltage for the...
This circuit was obtained from an American 1980s documentation. The frequency depends on the...
This 80's circuit uses a small light bulb as an indicator, but an LED with the appropriate resistor...