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 with PUT is from a 1967 General Electric manual. The relay must have voltage...
This is half of a 4-channel amplifier from a system published in the October 1971 issue of Radio...
This circuit, from the Texas Instruments component datasheet, allows the switching current to be...