This circuit was obtained from an American documentation from the 90's. The transistor can be a low noise general purpose like the BC549.
The 10 W power is obtained with a load of 2 ohms. The integrated circuit must be mounted on a good...
This TTL circuit was found in the February 1973 issue of Radio Electronics magazine. The power...
This circuit was originally designed for testing crystals used in color televisions, but it works...