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 circuit is from the National Semiconductor's Linear Applications Handbook of 1994. The...
This RF signal meter has a switch position that allows calibration and comparison of low intensity...
T We found this circuit in the 1960 Mullard transistor application manual. The circuit can be...