This circuit provides a signal that is twice the frequency of the input signal. The circuit was found in the April 1990 issue of Radio Electronics magazine.
Found in American documentation this circuit uses transistors of the time. The circuit can be made...
This circuit sensor is an NTC with a resistance of the order of 2k. The SCR can be from the TIC...
This two-transistor circuit is from a Radio Electronics magazine from April 1965. The transistors are...