This grounding test circuit was found in an American 80's documentation. The circuit is for the 110 V power grid but can be changed to the 220 V power grid.
We found this circuit at a January 1991 Modern Electronics. The magazine no longer exists, but the...
Three LM158, LM258, LM358, or LM2904 operational amplifiers are used in this instrumentation amplifier....
June 2016 - Mouser is providing the new chips of Murata noise filters to products that employ this...