This dual balanced modulator configuration was obtained in a 1980s telecommunications documentation. The circuit makes use of transformers and the diodes are commonly used.
This circuit generates an audio tone whose frequency depends on R1 and C1. See in the math section...
The National Semiconductor LM675 operational amplifier can provide up to 3 A of output current. In the...
An interesting option is the one that makes use of the MC3373 integrated circuit and which is...