Found in General Electric's documentation from 1970, this circuit is indicated for the so-called “Solid State Lamp” (SSL). The LED symbol in the original diagram is inverted.
We find this current meter circuit from 0 nA to 200 nA in a Linear Technology application manual....
The circuit presented uses the high-power operational amplifier LM12, which is currently not an...
This circuit is from an English magazine Radio and Electronics Constructor of November 1978. The...