This 80's circuit has been winning. It is a 1 000 gain sample and hold circuit and an offset current setting. The configuration can be adapted to operate with modern equivalent components.
This circuit is from 1976 documentation. It uses the operational amplifier 709 which is no longer...
This circuit was published in the January 1975 issue of Radio Electronics magazine. An article showed...
This circuit is from a Popular Electronics from the 90's. The audio amplifier admits equivalent. The...