Found in a Popular Electronics from the 90s, this circuit makes use of an unusual integrated today. The coils are for the medium wave range.
This circuit was found in a former Popular Electronics. The timing is set on the potentiometer and the...
This circuit transmits signals to an FM receiver at a distance of up to a few tens of meters. The...
This circuit was found in a 1969 US documentation. It provides a signal that can be externally...