[sdiy] xr2206/xr2207

[R. Drake]

update--

based on th helpful feedback (thanks all), i've decided to build a dual lfo
based on the exar chips...  then, in an unrelated search, i stumbled on an
old elector design (dec. 79: http://hammer.ampage.org/files/SEWAR.PDF)
originally intended as a modulator for a BBD reverb to create chorus/phase
effects.  but i'm planning on just hacking out the lfo section from their
design as the basis for my little project.

lots of useful archived material available at this site
(http://hammer.ampage.org), btw.  the first page is mostly guitar/pedal
kinds of stuff, but follow the "more..." links at the bottom of the pages to
dig in deeper. 



on 8/3/03 2:55 PM, patchell at cox.net at patchell at cox.net wrote:

> The XR2206,XR2207, and the 8038 are all only suitable for LFO applications, in
> my opinion.  They do not have sufficient linearity for a pitch source.  the
> 8038 comes the closest.  If you do not care about accurate pitch, any of these
> will make nice oscilators.  The 2206 has some nice features, such as a built
> in multiplier for doing AM...
> 
> -Jim
> 
>> 
>> From: Keith Daniel <ensign7 at e-scape.net>
>> Date: 2003/08/03 Sun PM 02:42:17 EDT
>> To: <synth-diy at dropmix.xs4all.nl>
>> Subject: Re: [sdiy] xr2206/xr2207
>> 
>>> xr2206 function generator and xr2207 vco chips.  i scooped up a couple of
>>> each of these at the local surplus outlet...
>> 
>> I tried those out several ice ages ago, as well as an Intersil chip (number?)
>> that had a decent sine wave.
>> 
>> They are easy to set up and use, if you want a VCO with good linear
>> characteristics, but only one CV input.
>> 
>> Specs are going to be a bit hard to find. I started throwing out data books
>> when they started to resemble telephone directories.  :-)
>> 
>> Good luck, best wishes.          kwd...
>> 
>> 
>>