STK4050 Audio Amplifier with 200W Output

Figure 1 

The project is based around the hybrid integrated circuit STK4050 manufactured by Sanyo to build a low noise mono audio amplifier with complete high quality.

The project has a maximum output power of 200W while incorporating a volume control. The power supply used in the circuit is an on-board type and because of this, only a center tapped transformer is needed for the powering of the circuit. The sound has a very good quality and it can be proven when used in home theaters, in computers, and other audio equipments which can also be used as subwoofer amplifier.

For thin-type audio sets, it can be considered as a compact package. The heat generated in thin-type audio sets is being dispersed easily with a good heatsink design. There may be case where a shock noise may be encountered especially during switch ON and switch OFF. This can be reduced by providing a constant current circuit. The design of the circuit can be tailored for reducing occurrence of thermal shutdown, short circuit protection for loads, shock noise muting from external power supply.

The load resistance should have 8 Ohms value with 55K Ohms input impedance.