The circuit presented is based on the National Semiconductor's LM3524, a component not common today. The circuit is from the 1994 Linear Applications Handbook.
With this circuit, from an old operational datasheet, it is possible to measure the CMRR,...
Found in a Popular Electronics from the 90s, this circuit can be adapted to use LEDs. The power...
The circuits shown in the figure, that of an infrared video signal transmitter and receiver, were...