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Monday, January 02, 2006
5 comments:
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© Matrixsynth - All posts are presented here for informative, historical and educative purposes as applicable within fair use.
MATRIXSYNTH is supported by affiliate links that use cookies to track clickthroughs and sales. See the privacy policy for details.
MATRIXSYNTH - EVERYTHING SYNTH
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This is great help for Fizmo owners, but there's a potentially big problem if folks follow these directions exactly. I wrote to Norm to explain, but simply put, the capacitor leads are left too long.
ReplyDeleteIf such a unit is shipped, it's very likely that these caps will bend over and possibly short against each other or the pc board. Not good. I've seen this happen before.
So... if you do this mod, shorten those cap leads! :)
I thought they were a tad long as well. Norm probably just wanted to avoid heat damage to the components. I was thinking about applying the caps to the other side of the circuit board.
ReplyDeleteThat's a better idea if the bottom of the pcb is accessible. I've never touched a Fizmo (and don't have those pics in front of me.)
ReplyDeleteThe caps should be as close to the regulator as possible though. The bottom might actually be better too since they probably won't see as much heat. (heat rises, I hear ;-)
Few additional things.
Heat, unless one is a really bad solderer or using the wrong iron, probably won't hurt the regulator much. The tantalum caps are more sensetive though.
The regulator should also be tightened down before soldering it, not after. More strain can be placed on the leads if you do it in the opposite order. :)
So, do these things really sound like PPG's? :)
OK, I followed the link, which linked to another link, which is dead. To summarize: the problem is a regulator which is underspecced, i.e. it probably is not rated for the current it is required to deliver.
ReplyDeleteIt is most likely a low-cost 78xx or 79xx variant. Replacing underspecced regulators is sound advice though, because a fried regulator will often destroy other, far more valuable components!
here's a waybackmachine link - http://web.archive.org/web/20050817095415/http://www.nvogel.com/fizmo/regulator.html
ReplyDelete