This circuit was found in an Electronics Now of the 80s applying to NiCad batteries of the time. The circuit is powered by a 12 VAC source, for example, the secondary of a transformer.
This circuit is from an American publication about old neon lamps. The circuit is leak proof and...
Another useful audio circuit using an operational amplifier is the one shown in the figure. It is a...
This circuit is from a 1979 publication. The sensor consists of plates or screens that, when...