This circuit is from an August 1984 Radio Electronics magazine. It monitors the state of a RAM backup battery. Resistor R1 determines the battery charge.
This commercial radio from Iwata Electronics was manufactured in Japan in the 1960s. The circuit uses...
This stroboscope circuit with a high voltage lamp was found in Radio Elecronics magazine from July...
aaa The circuit shown generates 100 kHz signals for calibrating the scale of a receiver in 100 to...