The figure shows how to couple two CMOS circuits using an optical coupler to achieve isolation. The circuit is from a Radio Electronics from August 1992.
Using a 4017 as a base, this circuit from a 1990s Popular Electronics generates low-frequency...
Approaching the hand or an object to the sensor of this circuit, the relay closes its contacts. The...
This 1967 General Electric circuit makes use of an array of 3 (integrated) transistors for an...