This 5.1 MHz circuit was found in a 1980s documentation. The frequency is given by the crystal and general purpose transistors can be used.
With 12 V of power and 8 ohms in each speaker we have 1.6 W of power per channel. With a 22 V...
If you have a disused old computer, the type that still has a parallel port, you can use it in...
Found in an American documentation from the 1960s, this circuit uses transistors from the time. The...