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.
Using a 4046 PLL this circuit generates rectangular signals in three wavebands that depend on the...
The basis of this circuit is a National Semiconductor operational amplifier that functions as a...
We show only one of the channels of an excellent audio preamplifier with the LM382 integrated...