We found this circuit in an old American documentation. The operational amplifier is from the time and the output used to control an SCR or other power control.
This circuit is from an Italian magazine of 1983, but it can be assembled with the most modern...
We found this circuit in a documentation for radio amateurs from 1977. The circuit can be changed to...
Found in a 1965 General Electric datasheet, this low frequency circuit divides the frequency of a 20...