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.
One touch on S1 and the circuit turns on. With a tap on S2 it turns off. This is the purpose of...
Found in a magazine 73 for radio amateurs from the 90's, this transmitter sends location signals in...
This simple 3-transistor radio with earphone was found in a 1967 documentation. The circuit uses...