This indicator or logic probe was found in the April 1979 Radio Electronics magazine. The integrated circuit is the 555 and the FET can be any general-purpose type.
Applying a high voltage to a mixed lamp can obtain a bluish light with a decorative effect. This...
This circuit was obtained in a 1976 magazine. We can use the 555 and another BC548 to generate square...
This AC operational amplifier has a power stage and a gain determined by R2. The maximum output...