Elektor Formant Modular

There are no CEMs or SSMs in the Formant.
The main problem is the uA726 used in the VCO's - a  "Temperature controlled
differential pair" of transistors in a can. The whole VCO is based up on it.
As are many other 70's analogs.

You *could* work out a replacement I guess (it has been done before I
believe), but then it would really be a formant VCO. It's a key part. You
can still buy them from dealers (and on Ebay occasionally) but at a fairly
high price.

The original Elektor articles are now in the "files" section of egroups.

ac



->-----Original Message-----
->From: 
->sentto-9333596-2-1046858476-lists=ftg.co.uk@...
->oo.com 
->[mailto:sentto-9333596-2-1046858476-lists=ftg.co.uk@...
->oups.yahoo.com] On Behalf Of rikdeclercq
->Sent: 05 March 2003 10:01
->To: ElektorFormant@yahoogroups.com
->Subject: [ElektorFormant] Re: DIY... decades later...
->
->
->rebuild formant
->> It is possible, but a few of the parts are pretty rare now and
->you'd end up
->> paying big money to the few people that sell them.
->
->I thought so. Still, wouldn't it be possible to post the original 
->schematics et.c. on this board, so that interested and 
->knowlegable people can have a hard look at them... and look for 
->alternative components/ ways to achieve the same result....
->
->Like there are ssm or cem chips around on the net but they're 
->ridiculously expensive, isn't it possible to actually recreate one of 
->these components on to a little pcb with discrete components, or 
->would that be much too complex/expensive?
->I know how to use a soldering iron, read schematics, but i'm not 
->smart enough to use pcb-layout progs, so i'm just throwing 
->around the idea....
->
->
->
->
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