This QST circuit generates 4 frequency signals according to the crystals used. Transistors admit equivalents although the indicated types can still be found with some ease.
The supply can be between 4 and 10 V in this circuit and R4 is necessary when the supply is less...
This is an integrated recommended for portable amplifiers, recorders, and battery powered radios. It...
Found in American documentation, this circuit generates linear sawtooth signals using a constant...