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Mean well vs generic power adapter vs  audio oriented smps
Mean well vs generic power adapter vs  audio oriented smps
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Old 3rd December 2020, 12:27 AM   #51
kasey197 is offline kasey197
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Mean well vs generic power adapter vs  audio oriented smps
Default Milli not micro!

Quote:
Originally Posted by kasey197 View Post
Here is what I used - a super basic mosfet cap multiplier along with a few passives...
Thanks to an eagle eyed correspondent who pointed out the common mode choke value error ... it should be 8 millihenries (mH) and not uH!


Also added the missing protection diode.

cheers!
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Old 3rd December 2020, 12:30 AM   #52
kasey197 is offline kasey197
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Mean well vs generic power adapter vs  audio oriented smps
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Originally Posted by LinuxGeek View Post
Thank you very much. I need this also for a 5V stabilization and have only 5.5V input. How much will the loss be ? Is 5.5V enough to get at least 5V out ?
Even with the logic level mosfets, the drop I measured was 2.3V. For your 5V application, I think just using the passive should be more than good enough !

Cheers !
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Old 3rd December 2020, 01:16 AM   #53
LinuxGeek is offline LinuxGeek  Germany
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Quote:
Originally Posted by kasey197 View Post
Even with the logic level mosfets, the drop I measured was 2.3V. For your 5V application, I think just using the passive should be more than good enough !

Cheers !
Just using the passive is only the cm choke ? Or also a cap ? I need about 4A at 5V.
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Old 3rd December 2020, 01:34 AM   #54
kasey197 is offline kasey197
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Mean well vs generic power adapter vs  audio oriented smps
CM choke, electrolytic cap and the mlcc is what i'd use....
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Old 3rd December 2020, 01:42 AM   #55
LinuxGeek is offline LinuxGeek  Germany
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Quote:
Originally Posted by kasey197 View Post
CM choke, electrolytic cap and the mlcc is what i'd use....
Thank you for advice. Will try it.
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Old 3rd December 2020, 08:05 AM   #56
ginetto61 is offline ginetto61  Italy
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Mean well vs generic power adapter vs  audio oriented smps
Quote:
Originally Posted by kasey197 View Post
Thanks to an eagle eyed correspondent who pointed out the common mode choke value error ... it should be 8 millihenries (mH) and not uH!

Also added the missing protection diode.
cheers!
Hi ! thank you very much for the kind and very valuable schematic.
I am sorry i am sure you have already explained why you have selected the mosfet instead of a bjt but could please direct me to the relevant post ?
i am very interested in cap multiplier ... but i understand there are some issues with mosfets ... and actualy i see normal bjts much more common, maybe in a darlington arrangement
Thanks a lot again, gino
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Old 3rd December 2020, 08:55 AM   #57
kasey197 is offline kasey197
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Mean well vs generic power adapter vs  audio oriented smps
Gino: Sorry I can help much. I just found mosfets much easier to deal with here.

There are many many good Cx multiplier designs to choose from, so i think you can compare easily.

I tried a BJT Cx multiplier with TIP142 using Rod Elliots designs but it appeared to (i think!) oscillate so I just surrendered without making much of an effort trying, as the only apparent benefit was lower volt drop...
I'll tell you this though: For sure, its not the device, just user error.

I'm sure the bipolar experts can suggest something that works well for you if you like to compare !

Last edited by kasey197; 3rd December 2020 at 08:58 AM.
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Old 3rd December 2020, 09:36 AM   #58
ginetto61 is offline ginetto61  Italy
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Mean well vs generic power adapter vs  audio oriented smps
Quote:
Originally Posted by kasey197 View Post
Gino: Sorry I can help much. I just found mosfets much easier to deal with here.
There are many many good Cx multiplier designs to choose from, so i think you can compare easily.
I tried a BJT Cx multiplier with TIP142 using Rod Elliots designs but it appeared to (i think!) oscillate so I just surrendered without making much of an effort trying, as the only apparent benefit was lower volt drop...
I'll tell you this though: For sure, its not the device, just user error.
I'm sure the bipolar experts can suggest something that works well for you if you like to compare !
Hi thanks a lot again, I was actually thinking to the same project with the TIP142
My next step will be some sims ... just starting
Anyway the scope does not lie. Great design and congratulations again.
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Old 3rd December 2020, 09:41 AM   #59
NickKUK is offline NickKUK
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Originally Posted by ginetto61 View Post
Thank you very much indeed. Smps are very handy also for some chip amps requiring 24-48 VDC. I am using one MW mod. DRP-240-24 on my desk (under the amp in the pic) .
i will try soon a 20A unit ...
I'm considering for a DC filament supply for a number of 6SN7s (600mA 6.3V) and 6AS7s (2.5A 6.3V). A 6.3V V+ & V- supply would work as the push pull has a B- line too so keeping the heater-cathode difference down would be useful so with running a linear for the HT so I'll need to tie them together (and I know some SMPS don't like this).

Oddly I have a Meanwell 12V B+/B- in my Koi pond drum filter controller - only having to return it for warrantee due to a water short
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Old 3rd December 2020, 10:51 AM   #60
ginetto61 is offline ginetto61  Italy
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Mean well vs generic power adapter vs  audio oriented smps
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Originally Posted by NickKUK View Post
I'm considering for a DC filament supply ..
Hi wrong place ?
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