We found this balanced modulator circuit for DSB and possibly SSB transmissions in US 1980s telecommunications documentation. The diodes can be replaced with equivalents.
In the circuit of the figure we used a potentiometer of 1 k ohm. We can use a larger...
The purpose of this circuit is to increase the sensitivity of a common multimeter in its voltage...
Using the LT128 and LT1037 from Linear Technology this circuit has a 400 MHz gain x bandwidth...