This circuit uses an LED (called SSL) to regulate current in a configuration with complementary transistors. The circuit is from 1970 General Electric documentation.
Found in Motorola documentation from the 1980s, this circuit employs an integrated device from...
This signal strength meter (S-meter) was found in a 1975 amateur radio publication. We can use...
The circuit shown in the figure is indicated for alternative energy sources, such as those...