We found this circuit in the February 1983 issue of Radio Electronics magazine. The 4-digit circuit is based on dedicated integrated circuits of the time. The power supply is not shown.
This sample and hold circuit was found in ancient European documentation. The operational can be...
The integrated circuit used in this filter is like to a double 741 and must be powered by a...
This circuit is from an American publication translated from 1974, but it is feasible since modern...