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Date: July 06, 2001 at 02:52:01
From: Jason U., [spider-to043.proxy.aol.com]
Subject: Re: Building a subwoofer amplifier

URL: Electro's Realm (my personal web site)


I bet Audio Amateur didn't buy three of the same kit from Vellman and other manufacture amps. This is how you do a real test. Each semiconductor components in the amp has different specs. I have seen several unused soldered points on the circuit board from different manuafactures. It really doesn't look clean. If manufactures sets a minimum limit on the estimated semiconductor performance for their amp design or any circuit design, then they can do a better job on predicting circuit performance and reduce unused solder joints on the PCB.

Making amplifiers from 200 watts and up gets risky. Start small like a watt, then increase gradually. The easiest and the most popular way of making amplifiers is using a three stage amp. The first stage increases the current to some what, but it depends on the goal of the amp. The second stage is the voltage amplifier. Last stage is the output stage that powers the load. If you achieve your output goal, you can consider to enhance your amp. One way is to improve the dampening factor. Second, improve the efficiency of converting energy into useful energy. Third decrease the distortion.

The amplifiers from Tripath looks interesting to look at. The wattage on these amplifiers range from 10 watts to 500 watts. They come in a dual amplifier package, so you can achieve 1000 watts by briding them. Tripath amplifiers are contain in a module package, but you still need some output devices to handle the 50 watts and up. This amplifier design only needs two N-Channel MOSFETs for each channel, so the cost is low. The minimum component count from this amplifier design increases reliablity.

Don't assume that the writer is right on his opinions. Your ears will tell you how well the amplifier can perform.

I have a book that explains everything about an amp and notes on constructing one. It is titled "Audio Power Amplifier Design Handbook" by Douglas Self.


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