2 VCO's - 1 Log convertor (polysynth design)

[terry michaels]

Message text written by INTERNET:WeAreAs1 at aol.com
>In a message dated 5/25/99 6:36:28 PM, you wrote:

<<Along the same line, were the EML-101 4 vco's linear or expo? (1.2v/oct)
how
many log converters?  I believe they did have at least one 726 heated pair
inside.>>

Yes, they were exponential.  The ua726's were used in a slightly 
unconventional manner, as I remember (I don't have the drawings near me at 
this time).  I think the VCO's may have shared one of the 726's (or half of

it??)

Terry Michaels could probably explain it better than I.  Terry?

Michael Bacich
<

Hi Michael:

You're right, the EML 101 vco's are exponential.   A single transistor, 1/2
of a 726, drove each oscillator.  No Vbe compensation transistor was used. 
 This design is extremely dependent on the thermal stability of the 726,
and will slew through a huge frequency range while the 726 is warming up.

Terry Michaels