This circuit was obtained from an old American documentation, and practically any general-purpose transistor and sensitive relay can be used according to the supply voltage.
This circuit was found in Electronics Today International of the 80's. The circuit uses still...
Found in an Electronic Design, this circuit is intended to produce signals in the VHF band. The...
This circuit uses a not easy to find IC these days. The circuit sources 15 W to a 4 ohm load and...