This charger was found in the February 1978 issue of Radio Electronics magazine. The circuit is for low current, only 150 mA, and has a 12 V transformer in the power source.
Indicated in Maxim's documentation from the 90's, this circuit has a gain of 40 dB and an output...
This is the basic configuration of many LM339 manuals, as a comparator with hysteresis. The font...
This radio with selector switch tuning was found in a Popular Electronics from May 1956. Listening is...