This filter was found in Delco's 1965 documentation. It can be implemented with modern components according to the voltage and current to be regulated.
We found this circuit in an internet documentation. The circuit uses a 1 mA instrument, and the...
This circuit can be used to measure the frequency of a low frequency square signal. The signal can be...
This circuit is from 1985 documentation. The integrated circuit used is not very common today, but...