This SCR circuit can operate on frequencies from 1 to 20 kHz. We found it in an American documentation from the 60's. The SCR must be according to the load. No information is given about the transformer.
We can implement this filter with more modern equivalent operational amplifiers, since the LM110 is...
This is the transmitter for the previous circuit. We found it in a 90s Electronics Now. The...
We have already presented this circuit, obtained from manuals from other manufacturers of the used...