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 components of this filter are calculated using the formula f = 1 / RC and it can be...
The circuit is from an Electronics Hobbyst Handbook from the 90s, being valid for panels of the...
This configuration was found in an English magazine from 1965. It is valid for any junction FET. The...