MAT04 for ASM-1's

[Magnus Danielson]

From: Mantid <antennae at fatnet.net>
Subject: MAT04 for ASM-1's
Date: Sat, 18 Nov 2000 19:10:41 -0800

> Hello fellow synth nuts,

Hi synth nut,

> I am building some ASM-1's and am thinking of using MAT04's for the matched
> tranny pairs. I just happen to have a few of these in my possesion. If I
> was to use one MAT04 for two VCO's would I have to worry about the VCO's
> interacting with one another?

By just taking a quick look into my PMI databook I see no reason to
why you should not be able to use a single MAT04 instead of a pair of
MAT02s. Naturally you would need individual tempco resistors.

The VCO's interaction with each other is really due to disturbances
which causes intermodulation. A common temperature on the expo's
doesn't heal that problem. You could however possibly reduce the
relative drift between them since the expo converters experience
basically the same temperature.

> Also, is the Moog ladder filter tranny matching method appropriate for
> ASM-1 VCO tranny matching.
> It seems that the Moog method is for trannys as diodes and the ASM -1 needs
> trannys matched for beta.

The Moog measurement technique is a way to narrow the range of those
times transistors. Today we should be able to better characterize
transistors.

Cheers,
Magnus