Described in the December 1969 Radio Electronics magazine, this circuit is intended to supply the previous circuit. The circuit is not isolated from the power grid.
Found in Radio Electronics from the 90s, this circuit uses a thermistor as a sensor that can have...
The scale of this scale uses LEDs, and its accuracy depends on the number of LEDs. We found this...
Found in American documentation from the 90s, this circuit generates sound bursts according to the...