Found in an old Popular Electronics this circuit is still current. The SCR can be of the 106 series and the relay according to the voltage used in the supply. The voltage can be 12 V.
This Audio System circuit was found in 1965 documentation. It is a 50 ohm line circuit with 22 dB...
This circuit is from an Electronics Now, American magazine from December 1992. The magazine no...
This circuit allows to increase the output power of a 741 as an amplifier. The circuit is from a...