[sdiy] Zener diode wattage tolerances

Bob K farfisa5 at gmail.com
Mon Jul 9 21:04:49 CEST 2012

Thanks.  It's slowly now coming together that this is a very strange
animal indeed.

I'll look over the guts and see what else is in there when I get home
tonight.  Turns out this may just be a piece of garbage that was
poorly designed.

It's more of a noise machine than a synth I guess.  No keys, just
line-outs and knobs.

I bought it for $10, so I'm willing to take that loss if the thing is
completely trashed.  I didn't try turning it on when I got home so I'm
not even sure it works.

The burned diode made me cautious on initial inspection so I just went
to this list first-thing in the morning with my questions.

You all are quite the indispensable asset.

On Mon, Jul 9, 2012 at 11:51 AM, djstorm <djstorm23 at gmail.com> wrote:
> On Mon, Jul 9, 2012 at 1:01 PM, Bob K <farfisa5 at gmail.com> wrote:
>> I was just doing some research in regards to the photos I took.  It
>> appears that this pcb is actually taken from a Gottlieb pinball
>> machine from the early 1980s!  That would definitely explain the large
>> voltages.  The person must have hacked it into the synth for some
>> reason.
>> Weird weird stuff.
> In looking at the pictures here of circuit board A2:
> http://www.pbresource.com/hauntedhouse.html
> It's listed as a "power supply" board.  The board number code is different,
> but the layout appears the same.
>  I also looked up the IC on the board, and it's a voltage regulator.. so
> this doesn't leave much else to the circuit itself.
> Meaning- I could be completely wrong, but this board may only exist to
> provide different voltages to other parts of the synth.  In which case, it
> could probably be replaced by something more modern (and less broken), if
> you were to know what it was supposed to be supplying (and what it had as
> input).
> It's hard to tell without the context of the rest of the synth- what else is
> in it?  Odds are, the high wattage/voltages might be completely
> unnecessary!?

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