In the figure we have a simple way to have a peak bargraph indicator. The amplifier is of the audio type, but operational ones can be used. The circuit is from Radio Electronics from March 1980.
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...