[sdiy] icl8038

[Laurie Biddulph]

I have succeeded using an Exponential Converter 
("http://www.elby-designs.com/panther/ed102-octave2hertz/ed102-schematics.pdf") 
with the 8038 
("http://www.elby-designs.com/panther/ed101-linear-vco/ed101-schematics.pdf"). 
It works reasonably well with around a 5-7 octave range. I haven't seen the 
Electronotes approach so it would be interesting too compare them.

Best Regards

(Mr) Laurie Biddulph
Phone: +61 (0)2 4340 0938
Mobile: 0400 257 645

Elby Designs
ABN: 70 022 727 605
http://www.elby-designs.com

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----- Original Message ----- 
From: "Dave Manley" <dlmanley at sonic.net>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Sunday, February 18, 2007 7:22 AM
Subject: Re: [sdiy] icl8038


> Aaron Lanterman wrote:
>> ... it didn't work as well as the electronotes designs that jammed 
>> current from the expo converter directly into weird pins in the 8038.
>
> It's not so weird if you look at the block diagram and internals of the 
> part in this app note:
>
> http://www.intersil.com/data/FN/FN2864.pdf
>
> The expo converter current sources provide the charge and discharge 
> currents for the timing capacitor.
>
> -Dave
>