RE: Jayrope: Old but New -> Jamman outdoors: help on schematics

[Charles Zwicky <cazwicky@earthlink.net>]

Title: RE: Jayrope: Old but New -> Jamman outdoors: help on schem

I believe that the jamman uses a voltage doubler and bumps up the 9Vac which is then rectified and regulated down to +/- 12vdc and +5v for the logic circuits...

> I've had an educated poke
> around inside the jamman once or twice, but I haven't cracked this
> yet. schemos would be useful..... you'd think, on first examination,
> that the 9V ac only goes as far as a rectifier & then a 5V dc
> regulator, & that simply giving the jamman enough current at 5V
> would keep it happy. this appears not to be the case. I wonder if one
> of us ought to drop a line to mr sellon?
> what I'm trying to do is
> a bit different than jayrope's issue- I want to find a suitable
> universal power unit (like a laptop supply only smaller) to run the
> jamman off. these units all give out dc, so I need to figure out
> what's happening to the 9V ac (once it gets into the jamman) if I'm
> going to replace some of the process.....
> will let you know the
> minute I do this.
> duncan.

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