This circuit uses a 100 kHz crystal, but nearby frequencies can be obtained with appropriate crystals. Components are still common today.
General purpose, up to 8 A SCRs can be tested with this simple circuit. In special the circuit is...
Found in documentation from the 1990s, this circuit converts 12 V to 9 V from a car's power...
It is like to the previous circuit with a lock that keeps the LED on at the end of the timer. The...