Relays up to 100 mA can be driven by the 555 with the recommended circuit. The circuit is from an article in the September 1992 Radio Electronics magazine.
This circuit was obtained in the National Semiconductor Linear Applications Handbook of 1994. The...
This circuit was found in a Hands-On Electronics. Some restrictions must be considered as the need...
This circuit was found in a 1987 magazine. It measures the resistance of the skin using a...