Re: TO3 & HEATSINK

From: exxos (exxos_at_home.co.uk)
Date: 07/28/04 

Date: Wed, 28 Jul 2004 17:48:48 +0100

> A little more expensive but good performance in the MJ150xx series of
power
> transformers. The complementary pair MJ15003/15004 are higher voltage
than
> you need but especially good for high power audio amplifiers. They're
still
> TO-3 but there's generally no real problem in routing wires through the
heat
> sink if you protect them against rubbing and overheating by installing a
> gromet in the hole. The 3055 is an old workhorse, best for low frequency
> designs like subwoofers.
>
> For TO-220 packages, consider a MOSFETs instead of bipolar output stage --
> there are some really good medium power units available in this package.
> Norm

The MJ21194 power NPN looks nice, I have already tried some mosfets, They
seem to sound the same, but when I look at set freqencys on the scope the
wave is very much distorted, I've been trying this out for the past 2 days,
ive tried everything I can think of, they just dont seem to work as good as
transistors do. I'm all for using mosfets, though I think for my next
project I'll design a class D amp and use some mosfets for that.

Chris

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