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Old 3rd September 2012, 10:37 PM   #7231
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Sry, don't get it. Where exactly is the problem?
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Old 3rd September 2012, 10:51 PM   #7232
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Startseite | Null Problem
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Old 3rd September 2012, 11:11 PM   #7233
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Quote:
Originally Posted by Holger Barske View Post
Had another thought on this common mode choke thing and talked to a good friend of mine, someone who knows a lot more about chokes than me.

To put it short: Forget it. You can't use common mode chokes in the DC section of the PSU (aka behind the rectifier).

The reason for this is simple: common mode chokes are for filtering common mode components. The ripple currents on the plus and the minus lines of a PSU aren't common mode - they are just the opposite (given an identical load in both lines). So you might have the brillant idea to reverse one of the coils to have common mode ripple.
The problem is: if you do so, you also reverse one of the DC currents through the core. So both DC components won't compensate any more, they will add up.
Which leads to massive saturation of that tiny core. Result: Your inductance is gone. Your common mode choke won't do any harm, but it won't have any effect on the signal at all.

Forget about common mode chokes, use seperate chokes for each of the two power lines.
Tanks Just what I need and briliant simple explanation.

I now see the error of my way so cancell common mode coke after rectifiers

Studiostevos you are not shoving common mode cokes on simulation are you?
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Old 3rd September 2012, 11:57 PM   #7234
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He's not - Duncan's PSUD can't handle commom mode chokes.
Apart from that, the simmed results seem absolutely fine to me.
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Old 4th September 2012, 12:02 AM   #7235
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Sure, just mind the voltage drop over the three 22r chokes...
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Old 4th September 2012, 12:16 AM   #7236
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Of course. You won't get very far with 24V secondaries here.
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Old 4th September 2012, 12:21 AM   #7237
kamis is offline kamis  Serbia
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Mr. John Curl uses Panasonic 100mh 1A CM chokes after bridges in all his preamps , including Blowtorch. How is it possible that often called legendary audio designer made such a mistake, if he really did? He attached PS schematic somewhere.
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Old 4th September 2012, 03:06 AM   #7238
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Just look at post 7228 ansver to that is there
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Old 4th September 2012, 04:21 AM   #7239
tvi is offline tvi  Australia
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Onkyo tried to patent the "Real Phase" power supply but I think they ran into previous art.
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Old 4th September 2012, 07:59 AM   #7240
pdul is offline pdul  Denmark
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Have anyone here actually tried the paradise with a standard psu setup, bridge and a pair of capacitors, and no chokes at all? Just for reference
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