This circuit is from the 1982 SGS Linear Circuits Manual. The circuit provides currents from 35 mA to 1.5 mA set at P1 and Vref voltages at 26 V set at P2.
With this circuit it is possible to fire an SCR from the light that falls on a phototransistor. The circuit...
This simple circuit can use any general-purpose transistor. The power supply must be isolated. The circuit...
Using a sensor from the time, this circuit was found in the 1992 Radio Electronics Handbook...