Volume expander amplifier (T364E)

This circuit was found in the 1961 RCA tube manual. The circuit includes a power supply stage.

FET dual analog switch (CB7247E)
We found this circuit in 1969 American documentation. FETs admit equivalents, as do transistors. The...
LED animation (CB22469E)
Found in a Popular Electronics from 1992, this circuit was created to give effects to an...
Signal Follower LM380 (CB13326E)
Both the field effect transistor and the integrated circuit of this 1970s circuit are no longer very...