AW: Re: [sdiy] divider ic's

[Czech Martin]

ITT chips? Hey, I work in this company.
I know the designer of some of these top octave dividers.
Back in the good old NMOS days.
Perhaps I could dig out a data sheet...

m.c.

> -----Ursprüngliche Nachricht-----
> Von: soundgood at web.de [mailto:soundgood at web.de]
> Gesendet: Sonntag, 25. November 2001 13:29
> An: synth-diy at dropmix.xs4all.nl
> Betreff: Re: Re: [sdiy] divider ic's 
> 
> 
> I will have a look tomorrow what the chips are and take some 
> more measurements. All I remember in the moment is that they 
> are ITT chips. Its for the CDX 652 organ I am working on.A 
> 1975 or 76 model.
> 
> All I found out so far is that there are 12 Oscillators in 
> this organ producing square wave outputs. This is applied to 
> the ITT chip which has 7 squarewave outputs of a half, a 
> third ....frequency. There is also an resistor array somehow 
> conected to the chip.
> The problem is I don't have any circuit diagrams of the 
> instrument so I have to figure everything out by myself.
> 
> Well pore infos tomorrow when I have been in the workshop.
> 
> But thanks sofar you have allready been very helpfull.
> 
> > Dear soundgood at web.de wrote:
> > if you want to try to replace the divider ic's used in an 
> organ then you
> > might want to consider using something like a cmos 4024 ic 
> > this has 7 stages inside , and each output is avaialble .
> > there is also the 4520 which has two seperate sections, but 
> not so many
> > dividers.The pin connections and voltage levels will probably be
> > different .
> > so it may mean making up a small sub pcb to correct the 
> differences .
> > if you let us know what ic's the organ uses then this would 
> help knowing
> > what to suggest as a replacement .
> > regards Peter
> >  
> 
> 
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