This circuit was obtained from a Linear Technology manual from the 90's. The integrated circuits are from the time and could possibly be tested as modern equivalents.
This commercial transistor radio was manufactured in Japan in the 1960s. The circuit has only 3...
This useful signal injector using two transistor was found in a Radio Electronics Magazine from...
In the figure we have the way to control a flip-flop with the 4069 from positive pulses. The...