The time of this timer depends on C1. The circuit was found in the July 1994 Electronics Now magazine. The supply voltage depends on the relay and can go up to 12 V.
The operational 714 (not the 741) is an old Raytheon type that is no longer common today. The...
With this shield circuit, you can control LEDs from an AND gate or microcontroller. When both...
This circuit was obtained in a 1990 English magazine. The circuit can be assembled with equivalent power...