This circuit is from a 60's documentation. The circuit uses components from the era and serves to monitor a 150V continuous power line.
If the reader has an old MSX still working, it can be used as a microcontroller for your robotics...
We found this circuit in a National Semiconductor publication from the 1990s. The circuit has an...
Found in an American publication from the 1970s, this circuit makes use of unusual components...