Dear Luther,
I hate to rain on anyone's parade however, these kinds of protection
circuits are very passe'. The reason being is that they are still either
current sensing or volt-amp sensing. What this means is that SOME loads,
especially very heavy reative loads, might activate the protection. It is
probably ok in the sense that these amps will not in anyway drive these
super difficult loads to start with no matter what Morris or Outlaw people
say. This I could prove any day of the week. In the final analysis there
are only two "right" ways to protect the amp. The first is to make it
strong enough in the first place so you don't need protection circuits. A
bit expensive, but effective. This way there are absolutely no limiters to
get in the way of the signal. The second is to use an input-output real
time window discriminator like I used in the big Sumo's 20 years ago. These
amps had enormous power capability and needed this kind of protection
mechanism. Again, no limiters of any kind to get in the way. These are the
right ways to do it.
James Bongiorno.
[Original Message]
From: Luther Ward <sae@...>
To: <SAE_Talk@...>
Date: 04/25/2000 13:15:47
Subject: [SAE_Talk] ATI grapevine
A little info I thought some of you would think of interest. I was
talking with Morris Kessler today about an amp I saw last March in
the design stage at ATI. It is a multi channel amp for home theater.
No biggie at first glance but as we were going over the schematics a
nice trick showed up. It has an optically isolated output section.
You can dead short the amp and it just goes into protection. Remove
the short and it starts playing again without any adverse affect to
the amp. Another twist here is you can not buy it at ATI. It is being
made for Outlaw Audio ().
ATI is using the design in their new 6 zone 12 channel amp. The amp,
also, shares the transformer with the other ATI amps that is wound
in-house at ATI. Pretty cool if you've never seen it done before. You
can see a picture of it and the multi-channel layout on Outlaw
Audio's web site.
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