This circuit is from a Radio Electronics from October 1970. The circuit uses transistors from that era and has a low impedance output. The resistance R1 depends on the impedance of the input signal.
We found this circuit in the Linear Technology Applications of 1997. The circuit uses components from...
This very low frequency amplifier has a gain of 1,000 and was found in a 1967 documentation. The circuit is...
This traditional dimmer configuration with SCRs, but with full wave control was found in a 1988...