This circuit is suitable for the calibration of old analog oscilloscopes. It was found in documentation from the 1970s and could be useful if someone is recovering an oscilloscope of the time.
ON Semiconductor Phototransistor Output Optocouplers Available from Mouser Electronics is the...
This precision rectifier circuit is suitable for applications in an AC / DC converter. We find it...
This is a circuit suggested by Linear Technology in a 1980s documentation. The integrated circuit is from...