We found this circuit in a 1982 documentation. It uses a CA3140 or equivalent operational amplifier and does not require a symmetrical source. The output is 1 Vpp wide.
This circuit was obtained in a 1978 publication. The SCR may be the TIC106. What it does is act as a...
In the figure we have a high input impedance stage with a general purpose PNP transistor. An NPN transistor...
We found this circuit in a Popular Electronics of the 90s. The circuit can be easily mounted...