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 40-second timer uses common components. The output can be used to excite a power stage. With...
This is the circuit for the HM-10ª, an instrument sold by Heathkit. The circuit is from a Radio...
With modifications this circuit can even be transformed into a home communications system using...