Solid state relay (CB8518E)

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

Phase Shift Oscillator (MSB039B)
In this oscillator a phase shift network formed by C1, C2, C3 and R1, R3, R4 determine the fase...
Triac Inductive Load Interface or Shield (CB4592E)
For inductive loads we have the configuration shown in the figure. Note that the optical coupler...
3-Bit A-D Converter (CB14253E)
This circuit was found in the Linear Applications Handbook by National Semiconductor. It uses...