This precision reference circuit was found in documentation from the 1980s. It applies to other operational amplifiers. The power supply must be symmetrical.
The integrated circuit used in this filter is not very common today, but the configuration can be implemented...
In fact, this is the circuit also known as “vox”, that is, a relay triggered by sound. This...
This circuit makes it possible to reverse the direction of a DC motor through a relay controlled by a...