In use telephone indicator (CB8665E)

This circuit was found in a 90s Electronics Now. The circuit can use a TIC106 for the SCR.

Stereo Equalizer (CB16706E)
In the original 1992 application, this passive circuit was intended for use in the car. At that...
FM or VHF Receiver (CB4578E)
This 1995 circuit uses an audio amplifier that is no longer common today. However, other...
RIAA Equalization Amplifier (CB4952E)
This circuit is from an 80's documentation. The integrated circuit is from the time and the...