Solid state relay (CB8518E)

This circuit was found in a 90s Popular Electronics. Both the coupler and the MOSFET can be of any type.

4046 Pulsing Alarm Sounder (CB25767E)
This circuit was found in the October 1994 issue of Electronics Now magazine. The 40446 IC is a...
30 kHz oscillator (CB8136E)
Found in a 1967 EEE, this circuit generates a constant amplitude signal, stabilized by a zener...
Debounced switch (CB24335E)
This circuit is from the November 1974 issue of Radio Electronics magazine. The capacitor...