[sdiy] Differential Pair

[patchell]

Laurie Biddulph wrote:

>    My synth VCO used a temperature compensated differential pair in
> the form of the uA726 which appears to have gone in to the archives
> alongside the dinosaurs (extinct). The MAT02 seems to be the first
> replacement of choice here but has anyone looked at the LM194/LM394 or
> are there any other alternatives to consider as well as selecting two
> trannies from the drawer?
>
> Best Regards
> (Mr) Laurie Biddulph
> http://www.ozemail.com.au/~boobies
>
> Tel: +61 2 4340 1525
> Fax: +61 2 4340 0936

    The LM394 is also a good choice, as well as the MAT04...But, to tell
you the truth, I have made quite a few measurements involving the CA3046
(LM3046), and at about $0.50 each (at least here in the states), you are
not going to find much more bang for the buck.  I have been getting
about 1 to 2 cents log conformity over 8 octaves (using the compensation
for the Rbe).  Plus, I have been using it with an electronic
compensation, which means no heaters, and no temp compensating
resistors, with good results (not perfect, but pretty dang close).

    I am pleased enough with the CA3046 that I will not be ordering any
more MAT04's, which are $7 each now (when I bought mine, they were $4
each).

--
 -Jim
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