Under this name, Radioelectronics magazine published in the January 1974 issue a light exposure meter for photographers. The circuit used general-purpose transistors and a FET, with an LDR sensor.
This circuit is from Mallory 1968 documentation. The circuit makes use of period components and...
This circuit can be applied to several logics. The circuit is from an Electronics Now from the...
In figures 1 and 2 we have two current drains that can be made with operational amplifiers and...