Found in ancient American documentation this circuit uses semiconductors from the thyristor family such as SCRs, Triacs and unijunctions. The circuit can control loads up to 550 W with the indicated triacs.
The circuit shown is only for analog telephone lines. I found it in Popular Electronics (1991). It...
Three LM158, LM258, LM358, or LM2904 operational amplifiers are used in this instrumentation amplifier....
The figure shows a way to apply gain control to the LM3600 OTA. The circuit is from a Radio...