[sdiy] MAT04 / MAT14 and AN-299 Re: Elektor Formant Re: Test / Sequencer / Arduino

[Barry Klein]

Thanks for the mention - the history of that had faded away from my brain cells...
Glad it is documented somewhere.
I probably do have his letter (email?) somewhere.

Barry


-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Rick Jansen
Sent: Wednesday, March 25, 2015 7:51 AM
To: 'Synth-Diy'
Subject: [sdiy] MAT04 / MAT14 and AN-299 Re: Elektor Formant Re: Test / Sequencer / Arduino

On 25/03/2015 15:27, Florian Anwander wrote:
> Hello Rick
>
> I've built my Formant 1979. So I hope back then I wasn't not yet in 
> the foolish-range ;)

Oh yes, you were. But it suits you well :-)

> In regard of the uA726: I bought 10 from the seller utsource in China 
> / Hongkong for ~$3 each,  and they were not fakes. I think utsource 
> still offers them .

Ah, are they old stock, or produced new?

I stil have some uA726 spares too, I wanted to be safe :-)

Has anyone ever tried a MAT04 (two matched pairs on a chip) as the exp generator in a VCO? 
You could easily use two of the transistors as the matched pair, and use the other two as sensor and heater, as in AN-299 (Linear Technology Aplication note 299). The clamp circuit could be an external transistor.

Oh, MAT04 is now obsolete, but just succeeded by MAT14 last year!
<http://www.analog.com/en/products/linear-products/matched-transistors/mat14.html>
Time flies..

I see the author of AN-299 has left us, too <http://web.mit.edu/klund/www/jw/jw-music.html>
and that it mentions a certain Barry Klein book ;-) App note 14 mentioned can be found in: 
<http://cds.linear.com/docs/en/application-note/an14f.pdf>

rick
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