This circuit is from a 1978 Texas Instruments optoelectronics manual. The trimpot adjusts the LED current. Other currents can be adjusted if they are within the capacity of the FET.
This control circuit up to 1 kW was found in a 1967 RCA documentation. The components are from...
We found this circuit in an Analog Devices documentation from the 1990s. It provides an...
In this circuit the signal from the phototransistor is amplified by a Darlington stage and then...