Found in an Electronic Design and 1970s, this circuit uses transistors of the time. The transistors can be replaced with equivalents and the relay is 12 V depending on the power supply.
Bis This two-transistor circuit was found in the January 1994 issue of Electronics Now magazine. The...
We found this circuit in an old English documentation. The circuit can employ other gates and...
The circuit of the figure operates in an overtone of the crystal frequency, that is, in the...