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.
We found this 13.8 V power supply with 10 A in a 1986 documentation. The current indicated in the...
This nonlinear gain circuit was found in a 1965 Electronic Design. The configuration can be used...
We found this TTL circuit with the 7400 in the January 1975 Radio Electronics magazine. The power...