Aries Exponential Converter?

[Tony Clark]

> > Does anyone have any idea what the six terminal block "Exponential
> > Converter" is in the Aries VCO, VCF?
> 
> It gotta be some matched transistors pair
> (like lm394,ua726 or something exotic like it).

   Here's what Grant Richter said to me in regards to this very subject:

] The exponential converter seems to be Terry Mikulic's NPN-PNP circuit as
] published in Electronotes. See Electronotes #37 page 2. At least I 
] replaced a block with a 2N3904 and two 2N3906's which worked fine.
] The collector of the NPN goes to ground instead of +V.
] The resistor to negative supply sets the initial current I believe.
] There may be a Q81 type resistor also in the epoxy block?

   I haven't seen this circuit (could anyone send me a scan of it?).

> Also , are the Aries modules worth building in diy
> (sound,stability...) ? Opinions ?

   I've been told that they tend to be a little on the sensitive side. 
(i.e. super wide sweeps with 3/4 turn pots).  You might do well to invest 
in a few 10-turn panel pots for their circuits.
   Otherwise, I've not heard any negative remarks.

   Tony

------------------------------------,----------------------------------
I can't drive (my Moog) 55!         |     The E-Music DIY Archive
------------------------------------|  
Tony Clark -- clark at andrews.edu     | aupe.phys.andrews.edu/diy_archive
http://aupe.phys.andrews.edu/~clark |     Contributions welcomed!
------------------------------------'----------------------------------