This circuit of the 80s makes use of an operational one of the time. It can be designed with modern operationals and must use a symmetrical power supply.
This interesting circuit is nothing more than a joke. Of course it can be used for other purposes....
This circuit was found in a 90s Popular Electronics. Both the coupler and the MOSFET can be of any...
We found this circuit in a 1977 documentation. The XR2206 is not easy to obtain, but it consists of a...