[sdiy] circuit protection question

[nicolas]

The cheapo half-way house is to add the reverse diodes across the rails on every PCB, but only have the polyfuse or whatever doing the current limiting centrally at the power supply.  This is what I do, but using 1N4001 diodes means I am limited to 1A or less for the overall power supply capability - so I can only have a limited number of modules.  This hasn't been a problem for me so far, but precludes a really huge system running off a single PSU.

Nicolas

--- On Wed, 15/12/10, David G. Dixon <dixon at interchange.ubc.ca> wrote:

> From: David G. Dixon <dixon at interchange.ubc.ca>
> Subject: Re: [sdiy] circuit protection question
> To: blacet at blacet.com
> Cc: "'synth-diy DIY'" <synth-diy at dropmix.xs4all.nl>
> Received: Wednesday, 15 December, 2010, 7:46 AM
> > I've been using this technique
> since the late 90's. In fact, it was up on
> > our Tech page for years.
> > 
> > It's inexpensive and I have never heard of a blown
> module or received one
> > back for repair.
> > 
> > Why don't any other companies use this? Too cheap? I
> dunno.
> > 
> > People WILL plug things in backwards, it's
> guaranteed.
> > 
> > John "the Guru" Blacet
> 
> Thank you, Master!  Shall I fetch the Rolls with the
> concubines?  ;^)
> 
> But seriously, you ask a very good question, and given that
> a) I've
> personally fried way too many 2164s by powering them
> backwards, and b) we're
> just about to unleash a whole bunch of 2164-based modules
> on the Eurorack
> market (basically, a buncha guys who like to twiddle their
> little knobs), I
> think a bit of circuit protection is a no-brainer.
> 
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