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.
This circuit is intended to increase the width of a pulse. The circuit is TTL and can be used as a...
This transistor amplifier does not use a source with a transformer being fed directly by the power...
In the figure we have a protection circuit for sources that we find in a 1994 technical...