[sdiy] SSB Banana polysynth

[rtarcan]

More docs 

http://www.tauntek.com/banana.htm 

, Tom Wiltshire
yazmış: 

> Yes, it had occurred to me too that it simply might not have
been economic to mess about with it, even for a fairly simple fix. I
don't know what these things fetch(ed) but the CEMs were certainly worth
plenty. If the outside was beat-up too, it might have looked impossible
to make any sort of sense out of spending hours on it.
> 
> We'll see, I
guess.
> 
> Thanks for the documents - that's a *lot* more than I had
before.
> 
> Tom
> 
> ==================
> Electric Druid
> Synth &
Stompbox DIY
> ==================
> 
>> On 25 May 2018, at 15:59, chris
<chris at chrismusic.de> wrote: In december, Kenny Balys told AH that he
has some dox on the Banana, see his message quoted below The reason it
was stripped may have been simply that it wouldn't fetch as much as an
Oberheim or a bunch of CEMs (Ok, that may have been before the Alfa
chips). But then, maybe it *did* have problems. Chris On Fri, 25 May
2018 15:07:57 +0100 Tom Wiltshire <tom at electricdruid.net> wrote: 
>>

>>> Does anyone have any documentation for this beast? Or know much
about them? Specifically, I’m interested in how the voice Pitch CVs
are generated. From the era, I’m guessing DAC->4051->S&H, but I
haven’t even seen the main board, let alone the schematics, so it’s
real guesswork. I’m trying to help a customer debug one. They’ve got
one that was stripped of CEMs, so they’ve put Alfa chips in it. First
thought was that the Alfa chips are either faulty or not totally
compatible, but it doesn’t look or sound like that to me. I suggested
that there must have been a reason someone gave up on repairing it and
stripped it of valuable parts, and that we should find that reason.
Tom
>> On Tue, 19 Dec 2017 04:24:49 +0000 Kenny Balys
<kenny at beatkamp.com> wrote: 
>> 
>>> I put near everything I have on the
EEH Banana together. This material is all in German and includes the
MIDI instructions. The schematics are very casual and do not bother to
describe things like decoupling and the specifics of the front panel &
keyboard assembly. Still, everything is there that one would need.
http://www.beatkamp.com/downloads.shtml [1] PS: I will shortly be hand
building a MIDI board for my Banana. This involves a simple daughter
board tethered to the Z80 CPU socket (the CPU moves to the daughter
board). This also requires a new EPROM image (kindly provided by a
helpful list member). I am particularly excited to try the Banana split
mode where half the keyboard controls the inner synth and the other
half, an external synth. Cool! Hope it works.
>>
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