The operating frequency of this circuit is 465 Hz and the input voltage is 12 VAC. The circuit is 65% efficient. We found it in a 1968 Motorola publication.
This circuit consists of a constant current source for charging 12 V batteries. The charge is...
This simple neon lamp power indicator circuit was found in the January 1971 Radio Electronics...
We found this sophisticated meter circuit in an article in Radio Electronics magazine from June...