We found this balanced modulator circuit for DSB and possibly SSB transmissions in US 1980s telecommunications documentation. The diodes can be replaced with equivalents.
Found in a 1960 Sylvania manual, this circuit is intended to measure audio signals frequency....
We found this circuit for vocal effects in the September 1990 issue of Radio Electronics magazine. The...
Depending on the output transistor used, this transmitter can provide power from 1 to 3 W. The...