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 in a 1976 English magazine, and can be assembled with equivalent...
This amplifier is from a 1990s Linear Technology component manual. The circuit requires...
This circuit can shift the phase of a signal from 0 to 360º. FETs admit equivalents and the...