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.
This integrator circuit uses the junction FETs which can also be the BF245 or MPF102. The...
This 6 V battery charger was found on a 1987 Hands On Electronics. Rc determines the charging...
Found in an American publication from 1968, this circuit aims to keep the torque of a DC motor...