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.
The circuit shown is from the Motorola Linear Databook from 1990. The circuit has two outputs with...
Suggested by General Electric in 1965 documentation, this circuit controls the current at a load...
This filter for the scratching noise common in record players was found in Radio Electronics from the...