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.
When the VCR is turned on, the TV is automatically activated. This circuit of an old project...
This linear scale circuit can use the current scale of a multimeter instead of the 50 uA...
Obtained from an Electronic Engineering of the 90s, these circuits can be applied to almost any...