This differential amplifier, found in a 1964 Electronic Design, has a gain of 30. The setting can be applied to modern equivalent transistors.
Linear Technology's LT213 circuit, which suggests this application in 90s documentation, is not...
This circuit has the transistor chosen according to the maximum current desired at the output. Unlike...
This circuit is suggested by Motorola and makes use of a phototransistor with its own...