[sdiy] string machine technology?

[Loscha]

http://www.loscha.com/images/TOP_N_DIV.jpg

Peter,
I can sell you some
Have got keyboards to go with them, but, the chips are a little
lighter (I'm in Australia, btw)

-Ed

www.loscha.com

On 11/2/06, Tom Wiltshire <tom at electricdruid.net> wrote:
> If you really wanted to build one, you could try asking these people
> for a top octave generator:
>
> http://www.organservice.com/crm/topdividers.htm
>
> The rest of it should be simple - a pile of binary dividers, followed
> by perhaps some filters and BBD chorus/delays.
>
> Banzai Effects have a good collection of BBD chips:
>
> http://www.banzaieffects.com/Delay-Chips-Clock-ICs-c-373.html
>
> Other people who've said that the cheapest/easiest way is to buy an old
> organ are right though. I once tried to buy one on eBay, and put a
> couple of bids in, and finished up with two organs for £30! If you've
> got transport, they'll be even less - most people want you to take them
> away.
>
> Make sure you get a nice 1970's one, not one of the 1980's ones that
> are based on the M108 polyphonic organ chip or similar. Of the two I
> bought, I had one of each. The 70's one is a yamaha, and uses separate
> oscillators for the top octave (early 70's), followed by the dividers
> and then a couple of boards of filters. This would be ideal - just add
> a board full of BBDs - perhaps the effects board from a dead polysix.
> It even has quite a nice sounding amp and yamaha's weird vertical
> rotary speaker. The other is a cheap 1980's Italian thing based on the
> M108, which sounds awful, and doesn't have half the options for
> modification.
>
> Good luck,
>
> Tom
>
>
> On 2 Nov 2006, at 07:21, Peter Blackett wrote:
>
> > Dear Rykhaard, and DIy list.
> > as mentioned before if you are copying most of the production string
> > machines they use top octave generators and BBD delay ic chips to
> > produce the chorus effect.
> > it would be possible to use separate oscilators,to rep[ace the tog ic
> > , but I don't think it is easy to reproduce the chorus effect without
> > the BBD delay ic's.
> > [ if it is please let me know ! ]
> > But I would be interested to know what the Original String machines
> > built by Ken Freeman [ is that the correct person ? ] used.
> > of course if you have the space you could probably find a late 1970's
> > organ that has a string synth built in at a good price.
> > regards Peter
> >
> > D.A.M.I.A.N. wrote:
> >
> >> I thought of this tonight at work - finding a service manual for a
> >> String Machine, and cloning it.  Then my brain wandered off into the
> >> areas of simple design.
> >
> >
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