The LM10 is not common today, but the circuit can be adapted to operate with equivalent components. The circuit is from the 1994 Linear Applications Handbook by National Semiconductor.
A touch in this circuit turns-on the lamp or the relay. Power supply is according the lamp or...
This an old commercial receiver found in a year 1958 magazine. The circuit uses some transformer...
We found this very simple cable fitting circuit in an Electronics Now from the 90s. ...