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Old 14th May 2010, 08:56 AM   #2391
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Vref should be bypassed with low leakage current capacitor. Higher leakage there = higher noise. Oscon's are high leakage capacitors.
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Old 14th May 2010, 08:57 AM   #2392
Salas is offline Salas  Greece
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Quote:
Originally Posted by massimo View Post
Italian made caps...... mmmmhm more difficult to find even in Italy!
I could only find some old Arcotronics MKP1.44 SW 10uF/250V (axial, semi transparent orange body) which I'm planning to use instead of the Wimas 10uF/100V. (the MKP10 10uF/250V is too tall for my case)
Did you look into any ICEL by the way?
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Old 14th May 2010, 09:03 AM   #2393
massimo is offline massimo  Italy
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The best Icel PP caps (PPB Series, boxed, white, much better than the ubiquitous axial yellow ones) are available up to 6.8 uF and they are huge.
The solution for me is MKP10 10uF/100V or the already mentioned axial Arcotronics I have.

Last edited by massimo; 14th May 2010 at 09:16 AM.
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Old 14th May 2010, 09:12 AM   #2394
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by stormsonic View Post
Vref should be bypassed with low leakage current capacitor. Higher leakage there = higher noise. Oscon's are high leakage capacitors.
LINK1
LINK2
LINK3
In the past I experienced instability when placing oscon caps after regulators... particularly the negative ones.

OsCon sound very good decoupling digital circuits but need to be near the chip and away from the regulator.
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Old 14th May 2010, 09:17 AM   #2395
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i was thinking about Vref bypassing
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Old 14th May 2010, 09:19 AM   #2396
RCruz is offline RCruz  Switzerland
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I know.... Just wanted to add my experience regarding those caps.... Seem to have very low ESR and so act like a film in some cases.

Maybe these can work fine in the vref
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Old 14th May 2010, 09:25 AM   #2397
Salas is offline Salas  Greece
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Quote:
Originally Posted by RCruz View Post
In the past I experienced instability when placing oscon caps after regulators... particularly the negative ones.

OsCon sound very good decoupling digital circuits but need to be near the chip and away from the regulator.
Because the previous cap's ESR was intrinsic and calculated to the loop gain phase margin of the design. The OsCon dropped that. A reg is a DC amp. All complexities of amp design apply. And it must be better than your audio gain cct in DC so to get out of the way. That is why a reg has such an impact when initially seems like performing a secondary task.
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Old 14th May 2010, 09:26 AM   #2398
Salas is offline Salas  Greece
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Quote:
Originally Posted by RCruz View Post

Maybe these can work fine in the vref
No, leaky.
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Old 14th May 2010, 09:56 AM   #2399
RCruz is offline RCruz  Switzerland
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leaky means noise ?
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Old 14th May 2010, 10:18 AM   #2400
Salas is offline Salas  Greece
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Yes, in this particular position. Don't expect to hear any hiss, it will just smother some finer resolution. MKP for Vref is best in 1.2 as far as I am concerned.
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