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Re: [xpantastic] Xpander tuning issue

2018-11-29 by klosmon

I'd check the poly timing cap for that voice;\ufffd after that, there are 4051 CV demultiplexers associated with each voice which should be checked.\ufffd The CVs from those go to opamp buffers across smoothing caps to ground -- all should be checked out with a scope (comparing them to the signals from a working voice).

On 11/29/2018 10:13 AM, neil loughran neil_loughran@... [xpantastic] wrote:
\ufffd

sounds like a cap problem...\ufffd did you change op amp chips around too?

From: xpantastic@yahoogroups.com on behalf of David Cumming david.cumming@... [xpantastic]
Sent: 29 November 2018 12:01 AM
To: xpantastic@yahoogroups.com
Subject: [xpantastic] Xpander tuning issue
\ufffd
\ufffd
Hi,

My Xpander reliably passes all tuning functions but voice 1 goes out of tune (flat) within a few minutes afterwards while the rest stay in tune. I've tried swapping voice chips but don't know where to go from there. Any ideas?

Thanks in advance, David



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