The figure shows how to couple two TTL circuits using an optical coupler to obtain isolation. The circuit is shown in the August 1992 issue of Radio Electronics magazine.
This circuit from a National Semiconductor manual from the 1980s shows how to use the LM388, a...
This is a circuit with a new (at the time) component released by Raytheon in 1965. The circuit uses a...
Suggested by General Electric in a 1970 documentation, this circuit makes use of some components of...