Digital recorder ISD1016 (CB7963E)

Found in a Popular Electronics from the 90s, this digital recording circuit uses an unusual integrated circuit today.

Alarm (CB196E)
When the sensor X1 is opened, the relay is energized. When waiting, the current drained is very...
AC Inverter Amplifier with 5 V MC33171 (CB15270E)
This circuit can also use other series operational amplifiers such as MC33172, MC33174, MC35171,...
Symmetrical 9 V Power Supply (CB18699E)
This circuit was originally designed to power the CB18698's MSX interface, but it is suitable for...