We found this balanced modulator circuit for DSB and possibly SSB transmissions in US 1980s telecommunications documentation. The diodes can be replaced with equivalents.
This QST circuit generates 4 frequency signals according to the crystals used. Transistors admit...
This two-transistor circuit was found in a 1969 US documentation. Modern equivalent transistors can...
This JFET amplification stage was found in the April 1993 issue of Electronics Now. The input...