[sdiy] Russian divider chips..

[cheater cheater]

If you wanted to do this again you'd probably just use a cheap FPGA
for the dividers and most other logic and be done with it.

D.

On Thu, Oct 25, 2012 at 9:27 PM, Bob Weigel <sounddoctorin at imt.net> wrote:
> On 10/25/2012 6:23 AM, cheater cheater wrote:
>>
>> On Tue, Oct 23, 2012 at 11:31 PM, Bob Weigel<sounddoctorin at imt.net>
>> wrote:
>>
>>>
>>> On 10/23/2012 12:40 AM, cheater cheater wrote:
>>>
>>>>
>>>> What are you repairing.. an alisa maybe?
>>>>
>>>> Cheers,
>>>> D.
>>>>
>>>> On Tue, Oct 23, 2012 at 4:36 AM, Ove Ridé<nitro2k01 at gmail.com>   wrote:
>>>>
>>>>
>>>>>
>>>>> O
>>>>>
>>>
>>>
>>> Oh sorry I should have said, the creature is called an Elektronica
>>> EM-14...which appears identical save color to the EM-141 on ebay right
>>> now.
>>> The only mention on google of the EM-14 I see is the russian synth site
>>> and
>>> the one I bought on matrix synth :-)  So it's probably very rare in the
>>> states anyway.
>>>
>>
>>
>> http://www.ebay.com/itm/Syntorgan-VENTA-ELEKTRONIKA-EM141-Russian-Soviet-Hammond-Electro-Organ-/230815013008?pt=LH_DefaultDomain_0&hash=item35bda59890
>>
>> Wow, this is super overpriced. Probably worth 200 at best.
>>
>> Lots more similar things on ebay to be had.
>>
>>
>>>
>>> Hopefully we'll get some more info.  There are three divides and some
>>> chips
>>> with 145 and 155 in them on what is no doubt the generator board.  There
>>> are
>>> some signals there and some of them get to the divider boards but I don't
>>> think anything on the divider board is doing anything at the moment.  The
>>> power supply is wired for 120 I believe.  There is a xformer with two
>>> coils
>>> in it appears. Wound around opposite sides of the permeable "O".  AC
>>> comes
>>> into one side but is then jumped over to the other coil.  The other side
>>> of
>>> the first coil attaches to nothing.  The other coil's other wire is the
>>> other AC wire.  I'd think if it were wired for 220 like it says it would
>>> have a series arrangement of the two coils?
>>>
>>
>> So the two coils are wound in parallel? That's bizarre. Maybe it was
>> at first wired for 220, and someone either:
>> A) connected the second coil in parallel in some futile attempt at
>> experimenting
>> B) connected the AC into the middle between the two coils. This means
>> the two coils are in fact in series, but the way the AC connects to
>> them the first one is bypassed. This actually sounds like it could be:
>> it's better to wire the coils in such a weird arrangement for 220V
>> because it eases up manufacture. The lugs are closer together this
>> way, therefore the cables are easier to lay and solder.
>>
>>
>>>
>>> Anyway the voltages look like ones you'd expect..15, 5 and 0 so I dunno.
>>> I'm afraid to jack it up to 220 :-).  Not sure someone already didn't
>>> like I
>>> say.  Only the front end caps appeared bad which I replaced.
>>>
>>
>> Yeah, totally don't.
>>
>> D.
>>
>>
>>
>
> Having two coils that you can either series or parallel is the common way to
> allow for voltages to be selected...however in this case they just hooked up
> one coil it appears.  Which would make...half the current available but
> maybe it's that overbuilt...I dunno.
>
> Anyway it LOOKS LIKE WE FOUND A SCHEMATIC FROM IVAN!  HOORAY!
>
> And as to the value... these are actually quite a unique combo organ.  More
> drawbars than ANY I've ever seen AND GOOD SOUND QUALITY from the sample I've
> heard!  I bet if I do a good youtube video showing what we really have here
> I can get more than 700 easily.  (C'mon... there are 75 dividers that would
> cost at least 5 to 10 dollars each alone :-)  But it's what they did with
> them.  This is a good feeling very unique combo organ and there is a niche
> market big time for that stuff now.  It's just a matter of showing people
> what they're getting.   )
>
>
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