This circuit detects when a signal reaches its peak value. The source must be symmetrical and equivalent operational amplifiers can be used. This circuit was found in an old European publication.
This circuit was found in ancient American documentation. It provides a 70 Vpp signal at...
The figure shows a Wien Bridge circuit with non-linear feedback. The resistance of the RL lamp is...
Found in documentation for radio amateurs of the 70's, this circuit generates signals from 18 to 24...