This circuit uses an LED (called SSL) to regulate current in a configuration with complementary transistors. The circuit is from 1970 General Electric documentation.
This circuit was obtained from an English magazine from 1977. The magazine no longer exists, but...
Suggested by Siliconix in 1980s documentation, this circuit uses currently uncommon components. The...
With this circuit found in a 1965 Electronic Design, it is possible to read a peak voltage of up to...