The circuit shown is from a 1994 National Semiconductor documentation and can be implemented with more modern operational amplifiers. The power supply must be symmetrical.
This converter was found in the June 1991 issue of Radio Electronics magazine. The circuit uses...
This is a voltmeter with high input resistance. The transistor is germanium. We found it in an...
This control allows to start or stop a motor up to 3 or 4 A with a low intensity signal. The...