Found in a 90’s Popular Electronics, this circuit generates sinusoidal signals with frequency controlled by an input signal. C4, C3 and C1 together with R12 and R3 determine the frequency generated.
We found this balanced modulator circuit for DSB and possibly SSB transmissions in US 1980s...
September 2016 - It can be purchased from Mouser Electronics the new rectification controllers...
This high input impedance circuit was found in a Popular Electronics of the 90s. The circuit...