[sdiy] TC9400 and XR4151 in synths & other ramblings

[karl dalen]

 --- ChristianH <chris at scp.de> skrev: 
> And apparently that's what the developers of the Chroma oscillators thought
> as well.
> Seems funny that a Chroma chip is used to recreate a CS-80 circuit,
> since obviously they had at least a _little_ look at the CS-80. 

If you look closely into the schematics then you will realize why they 
used the 4151, its namely almost perfectly linear, however its also
not perfect, the saw wave slant on retrace. Actually you can as well say 
that the CS80 IG chip are recreateing "previous" designs as well since the
linear func generator design of the IG is by no means inovative or new
for that sense.

And the major reason might be that the 4151 was/is dead cheap! :-) 

> On Thu, 24 Feb 2005 22:11:42 -0500 (EST) The Old Crow
> <oldcrow at oldcrows.net> wrote:
> 
> >   I recently used the XR4151 in my module that recreates the Yamaha 
> > IG00153 (CS-80) VCO.  Seems made for the task.
> > 
> > Crow
> > /**/
> > 
> > On Thu, 24 Feb 2005, anthony wrote:
> > 
> > > I'm surprised that I don't see much use either of these chips: TC9400 or
> > > XR4151 in synth work. The commonsound atoner uses the 4151 and "The
> > > Modern Implement Company" mentions the TC9400 used in something called
> > > The Rube Goldberg Function Generator.
> 
> 
>