This precision signal rectifier was obtained in an American technical documentation from 1975. The operational amplifiers can be 741 and the power must be supplied from a symmetrical source.
Suggested by Siliconix in 1980s documentation, this circuit uses currently uncommon components. The...
Figure bellow shows how n 4027 can be cascaded to form a divide-by-2. The maximum input frequency...
In the figure we have an interesting protection bridge against power polarity inversion of a...