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.
We found this circuit in an old documentation. The integrated circuits used are specific to...
The integrated circuit used in this application is uncommon today and specific to the application, as it...
This 3-transistor buzzer or buzzer is a classic type found in the July 1998 issue of Electronics Now...