Using LM3909 integrated circuits, this circuit was found in an American documentation from the 90's. The frequencies can be changed by changing the capacitors.
We found this circuit in Motorola's 1990 Linear Databook. The component used is unusual. The...
Using the NE5205 integrated circuit this circuit was found in the May 1987 issue of Radio...
This is the diagram of the AM Sentinel 369 transistor radio obtained in a Japanese documentation from the...