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Old 9th November 2011, 01:52 PM   #21
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Do you think about something like that : PLK1182-ND ( Digikey ).
I made good experiences with common mode chokes too on the DC side.
Looking at post 16 again i think it is better to raise R4, R15 to 300 Ohm. That lessens the noise contribution of the second stage, drives the second stage more into class A and gives a slight open loop gain increase.
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Old 9th November 2011, 06:08 PM   #22
kamis is offline kamis  Serbia
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Quote:
Originally Posted by Joachim Gerhard View Post
Do you think about something like that : PLK1182-ND ( Digikey ).
I made good experiences with common mode chokes too on the DC side.
Looking at post 16 again i think it is better to raise R4, R15 to 300 Ohm. That lessens the noise contribution of the second stage, drives the second stage more into class A and gives a slight open loop gain increase.
Yes, but horizontal types are better when you have enaugh space to mount them-less radiated noise.It is very strange why CM chokes are so rare as filtering component in linear P.S.
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Old 9th November 2011, 06:54 PM   #23
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I think so too.
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Old 9th November 2011, 07:03 PM   #24
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Could you give me a hint what choke you prefer ?
Here is an interesting parer about noise suppression :
http://industrial.panasonic.com/ww/i...l/TT0001_e.pdf
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Old 11th November 2011, 01:55 PM   #25
kamis is offline kamis  Serbia
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Quote:
Originally Posted by Joachim Gerhard View Post
Could you give me a hint what choke you prefer ?
Here is an interesting parer about noise suppression :
http://industrial.panasonic.com/ww/i...l/TT0001_e.pdf
I am using CM chokes similar to Digikey distributed Panasonic series 4oo types.
They are 0.8A 68mH. If they are good enaugh for 300000$ Blowtorch or 4000$ Parasound Jc-2.......

Last edited by kamis; 11th November 2011 at 01:56 PM. Reason: typing error
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Old 17th November 2011, 12:55 AM   #26
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I found a simplified schematic of the Blowtorch PSU. JC seems to use the common mode chokes just like me.
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File Type: pdf TorchPS.pdf (31.4 KB, 323 views)
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Old 17th November 2011, 06:19 PM   #27
kamis is offline kamis  Serbia
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Quote:
Originally Posted by Joachim Gerhard View Post
I found a simplified schematic of the Blowtorch PSU. JC seems to use the common mode chokes just like me.
It is not Blowtorch power supply, it has never been published. Presented circuit was posted a long time ago by a French guy who was trying hard to guess Mr. Curl designs. All we have is detailed Mr. Curl description from which we see that he uses two rec. bridge approach , CM choke in the same way as you did in your PS. Unlike Frenchman, he uses adj. regulators in textbook manner, and furher down series resistor and simple open-loop shunt regulator of unknown topology, not IC referenced one.
Near the circuit, there are cap. multipliers , he said with 1A Harris Mosfets.
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Old 18th November 2011, 09:45 PM   #28
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Thanks for this information.
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Old 10th December 2011, 11:27 PM   #29
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Holger, i know know what you meant. You want to use the common mode choke BEFORE the main transformer. That is of cause also possible and no bad idea. We have a more conventional line filter then.
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File Type: jpg Circuit Example common mode choke ac.jpg (56.5 KB, 803 views)
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Old 10th December 2011, 11:30 PM   #30
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Sorry, wrong picture. This shows the common mode choke before the bridge. One possibility we already mentioned.
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