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Old 11th June 2012, 12:58 PM   #1341
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IRF240 / 9240 are much better cooling

Last edited by samoloko; 11th June 2012 at 01:01 PM.
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Old 11th June 2012, 01:23 PM   #1342
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by Tham View Post
.............Don't quite understand your question...I have a V1 Salas shunt set at 2.5A now providing the power for a T amp................
What happens if your speaker demands 2.6Apk?
or 5Apk?
or 10Apk?
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Old 11th June 2012, 02:58 PM   #1343
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Quote:
Originally Posted by samoloko View Post
what type and value are you using for ref filter cap and out cap

at 30V 200mA your fets are hot
Both MKT Arcotronics 10uF 63V

Salas regs plays better when current set x2 or x3 times the real current needed.
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Old 12th June 2012, 03:06 AM   #1344
Tham is offline Tham  Malaysia
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Andrew,
I don't have an answer to that...simply like what I heard using V1 and am hoping to upgrade it with BiB.
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Old 12th June 2012, 07:07 AM   #1345
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thx merlin

what does theory and practice say about size of local load decaupling caps - Pass D1 I/V In that case - used with PSU with 10 uF output
do you use original 220 uF at Pass D1 I/V
I am not sure but from what I see values of decouple caps get lower toward load
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Old 12th June 2012, 10:41 AM   #1346
AndrewT is offline AndrewT  Scotland
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A linear PSU consisting of transformer + rectifier + smoothing capacitor has enormous transient current capability. The down side is that the voltage available falls as current demand increases.
A series regulated linear PSU can have a very high transient current capability. The upside is that the voltage is more constant as current changes. But the reduction in absolute current output has been swapped for that reduced voltage change.
A shunt regulated linear PSU has an absolute current limit. The only component available to assist with transient current demand is the output capacitor.

Of the three options, I prefer the first for audio amplifiers.
Why you may ask? Because the design of the combined amplifier and regulated supply is very much more complicated than the design of a combined amplifier + unregulated linear PSU. Few can design Power Amplifiers. Even fewer can design for optimum integration of regulated PSU Power Amplifiers. Many will have you believe that you just pick an amplifier and pick a IC regulator and couple the two together. I don't believe that the majority of those Members even know what tests should be carried out to check for correct integaration of the reg+Amp, never mind the abilities nor resources to actually carry out that range of tests/checking.
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Last edited by AndrewT; 12th June 2012 at 10:45 AM.
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Old 12th June 2012, 10:44 AM   #1347
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by samoloko View Post
thx merlin

what does theory and practice say about size of local load decaupling caps - Pass D1 I/V In that case - used with PSU with 10 uF output
do you use original 220 uF at Pass D1 I/V
I am not sure but from what I see values of decouple caps get lower toward load
I think it was Leach that gave an example of using too low a value of MF local decoupling capacitors. nThere have been a few others.

HF & MF local decoupling must be located in the correct positions to be effective. Further they must be selected to supply the transient currents demanded by the devices in the amplifier.
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Old 13th June 2012, 07:11 PM   #1348
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Question IRF530 substitute

I don't have on hand IRF530 can I use IRF840B?
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Old 13th June 2012, 07:57 PM   #1349
vgeorge is offline vgeorge  Greece
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Quote:
Originally Posted by merlin el mago View Post
I don't have on hand IRF530 can I use IRF840B?
I think it' s been mentioned before, it will work, but not as designed.
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Old 13th June 2012, 08:33 PM   #1350
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Could I use while arrives IRF530?
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