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Old 18th December 2012, 07:37 PM   #2051
RCruz is offline RCruz  Switzerland
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+1 for sonicaps
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Old 18th December 2012, 10:21 PM   #2052
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Hi Salas,
I tried varying the gate stoppers but still have oscillations and varying voltage. Is there any problem using 2 positive regulators provided I used separate transformers, diodes, and caps with the only connection being at the load?
I have changed most of the components on the negative regulator but still have the same problem and just cannot seem to get it to work at high shunt current draws.
Thank you for all your advice.
Bill
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Old 18th December 2012, 10:33 PM   #2053
Salas is offline Salas  Greece
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No there is no problem using 2 positives, see the pic, but there should be no such persistent problem in a negative too. Has been used a lot in +/- configurations by now. Don't know how much they pushed spare current though. So it makes me wonder. What make are the IRF610s?
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Old 19th December 2012, 12:50 AM   #2054
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I have 3 other salas shunt supplies built and all are working fine in a +/- configuration.
They are all dumping around 100mA through the shunt.
All my mosfets are International Rectifier brand.
The diagram shown is how I plan to configure the supply except I have separate transformers for each regulator.
Thanks.
Bill
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Old 19th December 2012, 05:10 PM   #2055
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Quote:
Originally Posted by RCruz View Post
+1 for sonicaps
thank you for Input
how would you compare Sonicaps to Obbligato Gold In respect to BIB

I am Interested also what Merlin does think about Sonicap v Auricap v Obbligato Gold
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Old 19th December 2012, 06:07 PM   #2056
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Sonicaps teflon the best.
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Old 20th December 2012, 05:50 AM   #2057
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well I was talking about gen 1 caps
but you were talking about Platinums
have you tested gen 1 caps
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Old 20th December 2012, 06:32 AM   #2058
tom6 is offline tom6  Australia
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Is there anyway this can this be done using one transformer with a single secondary feeding both +ve boards or does each board require it's own secondary winding i.e. dual windings on the transformer?
thanks

Quote:
Originally Posted by Salas View Post
No there is no problem using 2 positives, see the pic, but there should be no such persistent problem in a negative too. Has been used a lot in +/- configurations by now. Don't know how much they pushed spare current though. So it makes me wonder. What make are the IRF610s?
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Old 20th December 2012, 07:49 AM   #2059
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Quote:
Originally Posted by samoloko View Post
well I was talking about gen 1 caps
but you were talking about Platinums
have you tested gen 1 caps
No.

How I choose a film capacitor:

Dielectric film
1st teflon
2nd MKP

Conductor type
1st foil
2nd metallized

Conductor material
1st copper
2nd aluminium
3rd tin

Waiting it helps.
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Old 20th December 2012, 09:11 AM   #2060
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by samoloko View Post
thank you for Input
how would you compare Sonicaps to Obbligato Gold In respect to BIB

I am Interested also what Merlin does think about Sonicap v Auricap v Obbligato Gold
Excluding teflon dielectric, obbligato GOLD is my preference.... Way better than Sonicap.

Auricap is very good but always leaves its rather special signature.... Obbligato is more transparent.
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