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 is the receiver for the transmitter suggested in CIR13081. The configuration is old, and...
This circuit has a frequency control. We found it in a Radio Electronics from January 1965. The...
This circuit was found in an old American magazine for radio amateurs. The circuit is based on a...