MOSFET Power amplifier 200W Circuit with BUZ905P,BUZ900P

200W_MOSFET_Amplifier picture

This project is develop from the MOSFET Power amplifier 100W that posted which it take to use in many activity such as Guitar amp,Mic,or Home theater and you will be to apply it.

As many people prefer because of its robustness MOSFET legendary. Altronics had a MOSFET amplifier with 200W, the product in a 4Ω, and we have decided to take a look at is.

It turns out that on the basis of the Pro One “, as described above, even if this version of Altronics and to the various MOSFETs. He has a rated output of 140W to 200W into 4Ω and 8W. Frequency range of 1 dB 20Hz up to 80kHz (Fig. 1). THD is less than 0.1% at full power (Fig. 2) and signal to noise ratio when compared to 200W is better than -100 dB unweighted.

Power amplifier MOSFET 200W Circuit

Performance of the prototype
Output power (RMS ):… 140W into 8 ohms, 200W into 4 ohms
Frequency Response:. 20Hz – 80kHz-1dB points (see Figure 1)
Input sensitivity: ………… 830mV for 200W into 4 ohms
Distortion: … <0.1% (20 Hz – 20 kHz) (see Fig.2)
Signal-to-Noise Ratio:. > 102dB unweighted, 105dB A-weighted with respect to 200W into 4 ohms
Stability :…………………….. Unconditional

Originally, the “Pro Series One” was developed by Hitachi MOSFET A-3 metal containers. They are no longer available, and their counterparts from plastics are very difficult to obtain. Altronics on this situation and have essentially the same circuits designed for Plastic MOSFET corresponds Exicon by the United Kingdom. This required a re-design of the computer, so that all MOSFET and the pilot for all transistors on a plate are vertically mounted on the radiator.

Besides the use of plastic in the power transistors, which greatly simplifies the assembly of the metal in comparison with A-3 power transistors, have Altronics spring clips in the proximity of the pairs of transistors, so things were still simple. The spring clips, just what the voltage for transistors and there is no harm in a transistor due to struggle more screws.

The heat sink is a black anodized aluminum extrusion with fins on one side. It measures 300 mm long and has a lid that a 80mm fan cooled 24V DC. The fan runs constantly, which means that the radiator is always cool (or at least slightly above the ambient temperature).