Found in a 1980s telecommunications documentation, the circuit presented acts as a product detector. The modulator or mixer in the square may be that of the previous circuit.
This circuit appears in other configurations on this site. Its purpose is to operate a small water...
June 2016 - It can be purchased from Mouser Electronics the TAS5720x the evaluation module from...
In the figure we have a circuit of a dimmer for fluorescent lamps. The circuit is from...