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Old 29th July 2003, 05:01 AM   #1
leo is offline leo  United Kingdom
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Join Date: Jun 2003
Location: notts
Default GC ideas

Hi All,
I was thinking about trying some Nichicon KZ capacitors in my Gainclone for decoupling, has anybody else tried these or compaired any other types?
MY current inverted GC spec is

OPA541, tried LM3875 but it oscillated, trying to sort this out
10k input and 220k fb Holco Resistors
1000uf 50v Panasonic FC decoupling caps bypassed with 0.1uf Evox SMR caps
100k Alps blue pot
No coupling caps
Mur860 for Rectifier, with snubbers
Two 24v AC transformers (33v DC)
Positive input straight to ground

Any Idea's what I could try to improve my GC would be much appreciated

Kind Regards,
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Old 29th July 2003, 08:03 AM   #2
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Join Date: Feb 2003
Location: Bristol
aparently (havent tried this) 100k potentiometers cause oscilation, and a 50k one should b better.

also, you could try zeroing the output by connecting the non-inverting input to ground via a ~200k multi turn preset.
If it aint broke, don't fix it. If it is broke, fix it.
If you can't fix it, take it apart and see how it "worked".
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Old 29th July 2003, 03:19 PM   #3
leo is offline leo  United Kingdom
diyAudio Member
Join Date: Jun 2003
Location: notts
Thankyou for your advice,
I'll try a 50k pot and see if it helps, as soon as I can sort this out I'm thinking about making a stepped attenuator

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