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From: Philip A. Marshall
Subject: Re: Looking for cheap isolation transformers
References: <email@example.com> <3DB192B6.FEF5DA2D@bellatlantic.net>
X-Newsreader: Forte Agent 1.92/32.572
Date: Sat, 19 Oct 2002 18:45:49 GMT
NNTP-Posting-Date: Sat, 19 Oct 2002 12:45:49 MDT
On Sat, 19 Oct 2002 17:12:52 GMT, firstname.lastname@example.org wrote:
>"Philip A. Marshall" wrote:
>> My point is not to change the output impedence, but to break the
>> direct ground connection from input to output, sortof like the same
>> reason isolation transformers are used to prevent people being shocked
>> in the case of a fault.
>But ground loops are external to the equipment. To
>solve ground loop problems, you are not looking to
>isolate the path from input to output. You need to
>wire things such that there is a single ground path
>for all equipment in the system. Throwing isolation
>transformers at it may work - but it is best to
>understand where the loop is created and address
>the specific problem. Say you do end up needing
>an isolation transformer - it's better to pay for
>just 1 than for multiples!
I've pretty much decided that transformers as part of the effects
isn't worthwhile. I can power all the effects off one power supply
easily enough, which only leaves the issue of the effects and the
amplifier being seperately grounded (which really can't be avoided).
So, a seperate box after the last effect with a transformer to isolate
the effects chain ground from the amplifier input ground (and hence
the amplifier power ground) is the only thing I'll need to experiment
with. That way I can still change the order of the effects and such,
and still maintain isolation.
I'll have to wait and see if it works.
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