We found this balanced modulator circuit for DSB and possibly SSB transmissions in US 1980s telecommunications documentation. The diodes can be replaced with equivalents.
We found this circuit in the 1957 Raytheon transistor application manual. The transistor can be a...
This different alarm system, found in an old publication, uses the starter chain to protect the...
This circuit is suitable for low impedance sources, using an operational amplifier. The gain is...