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

Luís Marka luis.marka at terra.com.br
Wed Mar 25 16:02:41 CET 2015


Wouldn´t the MAT14 be a nice replacement to the MAT04 in Jim Patchell's 
temp compensated VCO?

On 25/03/2015 11:50, Rick Jansen wrote:
> 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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