This 200 kHz oscillator was found on a 90's EDN. It consumes only 2.8 mW and has CMOS compatible output. CMOS power pins are not indicated.
This old receiver (1967) uses germanium transistors from the time and coupling transformers,...
This circuit can act as a shield being controlled by a microcontroller by pin 1 or 2. The...
A negative pulse applied to the input of the circuit shown in figure bellow turns on the relay....