The transistors in this circuit can be the BC548 and it also functions as a logic function. The supply voltage depends on the circuit to be excited.
This circuit, which operates between 7 and 30 MHz, was found in Radio Electronics from the 1980s....
This microphone preamp found in a 1995 documentation offers stable microphone operation. The...
This is the receiver circuit for the previous remote control published in the same Radio...