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.
The operational amplifier used in this configuration is uncommon today, but more modern types can...
This is a circuit that appears several times in this section and in articles. It is a preamplifier for...
We found this circuit in the August 1994 issue of Electronics Now. The 4046 is unusual today. The...