Mouser's name for a MAT-02

[Tony Allgood]

>Use cheaper pairs and the aforementioned Rbe compensation. To get the
optimum HF performance you'll need this anyway. These cheaper duals
(like 2SC1583 or the like) will be much better matched than spec'd.

I second this, the 2SC1583 is an excellent chip. I now use it for the
TB3030 and it works well. I didn't find I needed to use any Rbe
compensation either, since the top frequency of the VCO is limited by
the SCR arrangement locking up.

I use a SSM2210 in more 'serious' applications and again I do not use
Rbe compensation because Hemsath compensation in a saw VCO can cope with
any audible effects of Rbe error. Yes, I know its a different error, and
it follows a different law, but its good enough for me. I got tracking
better than +/1 cent across the full midi note range. I guess if you run
your VCOs higher than 8KHz you may need something better.

One of the benefits of the 2210 and other DIP pairs, is that it is easy
to 'glue' your temp co on top with just heatsink compound. The 2SC1583
is more tricky, sice it sticks up in the air.

The LM394 is made too, but only in the metal can version now. Has lower
Rbe, but more pricey at 7UKP a go. Can be made to fit the 8pin DIL
footprint easy enough.

And the bad news... both the 2SC1583 and SSM2210P are no longer made.
However, stocks are still very high. So no need to panic yet. However,
there are surface mount ones to look at, and coupled with a SM temp co
this could be the way forward for many of us. Jorgen's done this with
his little Bergfortron.

Regards,

Tony Allgood  Penrith, Cumbria, England

Oakley Modular Synth and TB3030:
www.techrepairs.freeserve.co.uk/projects.htm
My music: www.mp3.com/taklamakan