[sdiy] Trim out DC offset on MG-1?

[George Hearn]

The VCA balance trim is there to minimize control feed-through, typically
trim for 0V output with 0V input and maximum Iabc (VCA Control Voltage).  If
you've got schematics, follow the signal path from VCO to VCF to VCA looking
for where the DC offset is introduced.  OTA based filters can often
introduce a DC offset, this is roughly static with a range of control
voltages, it may be possible to add a resistor somewhere to adjust the DC
level of the filter output/input to VCA.  Why is the DC offset on the output
a problem for you?  Is it causing clicks/pops when you gate the VCA?

-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of
tsheets at saturn5.com
Sent: 20 October 2008 21:10
To: synth-diy at dropmix.xs4all.nl; analogue at hyperreal.org
Subject: [sdiy] Trim out DC offset on MG-1?


I have noticed I have a pretty bad DC offset on my MG-1, especially with the
bass sounds I like so much.

I tried adjusting the VCA Balance trim, but that did not affect DC offset.

Could adjusting and re-calibrating the filter trim help with this?

-troy

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