[sdiy] formant uA726

[René Schmitz]

Hi Troels and everyone!

troels jrgensen wrote:
> hi... do any of you know of any substitute for the uA726? i own a 
> formant modular.. and my voc´s need a uA726!..well at least i
> think.., i accidentally hooked up my power suply wrong.. and now the
> uA726 get VERY HOT, and the vco´s do not respond to incoming cv!

Thats quite a pity to belly up these rare chips.

> i got some help, and the guy told me to:
> 
> "Use an Analog Devices MAT02EH and a Tempco resistor. This is what I 
> use in the MOTM-300 VCO (www.synthtech.com)."

Or, use a LM394CH, 2SC1583 or 2SC3381 instead.

> but i´m new in the electronic world.. so have any of you guys tried
> to make a mat02eh fit into the space of a uA726, if, please help em
> out!

Why not make a little dongle board from perfboard? You need to take care
about the temperature compensation anyway! (The uA726 is haveing a dual
transistor and a temperature oven, the suggested duals don't have the
latter.)

> thanks
> 
> and by the way.. do you know of a substitute for the ca3084?
> 
> cause my filter and vca need them too!

I'd also use a dongle board, with a 2SA1549 or other PNP dual.

Cheers,
  René

-- 
uzs159 at uni-bonn.de
http://www.uni-bonn.de/~uzs159