This circuit can keep a set of lamps on for up to 1 minute, time given by C2 and R2 that can be changed. The load depends on the relay. The circuit is old, from 1988 documentation, but totally viable today.
Found in documentation from the 1980s, this circuit uses components from that time. The circuit is...
This circuit was described in an article in the February 1993 Radio Electronics magazine. The...
The figure shows how to add a Darlington stage to an operational amplifier in order to obtain a...