This simple latching alarm circuit using CMOS gates was found in the May 1990 Radio Electronics magazine. The supply voltage is dependent on the relay.
Found in a 1990s US publication, this alarm circuit detects when a light beam is interrupted. Optical...
This circuit came out at a Wireless World in January 2000. The circuit can be easily assembled as it uses...
This voltage regulator circuit has 1 A of maximum current for a TIP32 and 500 mA for a BD136. The...