This circuit is from 1964 documentation but can be easily implemented based on current components. Input waveforms and detection are shown next to the diagram.
Found in a PE Hobbyst Handbook from 1991, this circuit uses a common photocell as a sensor. The...
This very low power circuit is based on the ICL7860. We found it in an Electronics Now from April...
This simple converter does not use a transformer and the transistor can be the BD135 for currents up...