Found in a Hands On Electronics from the 90s, this circuit can be easily assembled today, as the FET can be equivalent and the operational is general-purpose.
This circuit is suggested by Sanyo and is based on the integrated circuit LA4430, manufactured by it. With a...
In the figure we have the way to configure an OR gate using 3 gates of the 7400. The circuit is...
This circuit was found in Popular Electronics from 1993. The 1458 consists of a double 555. The...