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Old 4th November 2012, 05:35 AM   #101
bobfig is offline bobfig  United States
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hay guys had my pcb's just sitting here and im thinking about populating them in the near future. im still a noob at this and am looking for some insight as to what power supply to run. Evette's quote about going with a 45v +- and changing the output to a MJH6284 but how big of a transformer?

im thinking a 500va that puts out at 30v would work. and hooked to a ebay psu board built to this specs.

Click the image to open in full size.

also about whats the cost to populate the pair of boards?
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Old 4th November 2012, 01:34 PM   #102
evette is offline evette  Canada
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about 30 dollars a board. Evette
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Old 5th November 2012, 03:42 PM   #103
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Quote:
Originally Posted by bobfig View Post
hay guys had my pcb's just sitting here and im thinking about populating them in the near future. im still a noob at this and am looking for some insight as to what power supply to run. Evette's quote about going with a 45v +- and changing the output to a MJH6284 but how big of a transformer?

im thinking a 500va that puts out at 30v would work. and hooked to a ebay psu board built to this specs.

also about whats the cost to populate the pair of boards?
Thanks Bob,

600VA for the stereo set works (a balance must be made between a large transformer and a compensated smaller one ). Especially for the current moving 1DIFFQC . If you love experimenting check this out. Power Supply Resevoir Size .You will need to locate high current chokes.

Looking forward to your build.

kind regards,

Harrison.
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Last edited by OnAudio; 5th November 2012 at 03:50 PM.
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Old 5th November 2012, 07:02 PM   #104
bobfig is offline bobfig  United States
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Quote:
Originally Posted by OnAudio View Post
Thanks Bob,

600VA for the stereo set works (a balance must be made between a large transformer and a compensated smaller one ). Especially for the current moving 1DIFFQC . If you love experimenting check this out. Power Supply Resevoir Size .You will need to locate high current chokes.

Looking forward to your build.

kind regards,

Harrison.
thanks so ill go with a 600va transformer that puts out 28v+-. as for that link im not sure what that attachment on your other post means.

i do like experimenting but dont want to use much money in the process as i have to buy everything.

with that said im buying this board to use as my power supply and im wondering how i should configure the capacitors on it. would having 2 larger 10,000uf caps be better then 4 smaller 5,000-6,800uf caps. i figure having the 4 smaller would allow for faster energy when the amps need it and possible better filtration. although i may be thinking about this all backwards.

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Old 5th November 2012, 07:33 PM   #105
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Originally Posted by bobfig View Post
thanks so ill go with a 600va transformer that puts out 28v+-. as for that link im not sure what that attachment on your other post means.

i do like experimenting but dont want to use much money in the process as i have to buy everything.

with that said im buying this board to use as my power supply and im wondering how i should configure the capacitors on it. would having 2 larger 10,000uf caps be better then 4 smaller 5,000-6,800uf caps. i figure having the 4 smaller would allow for faster energy when the amps need it and possible better filtration. although i may be thinking about this all backwards.
That thread refers to using line filters to keep things clean and reduce listener fatigue. Very nice board. Use the 10,000uf, will attach a link of a good sample shortly.
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Old 5th November 2012, 08:02 PM   #106
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Sample Transformer
Antek - AN-6232
Sample Bridge Rectifier
GBPC3504-E4/51 Vishay General Semiconductor | GBPC3504-E4/51GI-ND | DigiKey
Sample Capacitor
B41456B8109M EPCOS Inc | 495-4224-ND | DigiKey
Sample Line Filter
15EH4 TE Connectivity | 15EH4-ND | DigiKey
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Old 5th November 2012, 08:15 PM   #107
bobfig is offline bobfig  United States
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i was thinking on using these

Caps
UKW1H103MRD Nichicon | Mouser
UKW1J330MED Nichicon | Mouser


Bridge Rectifier
GBPC3510 Fairchild Semiconductor | Mouser

and ill use that transformer you linked.

Last edited by bobfig; 5th November 2012 at 08:18 PM.
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Old 5th November 2012, 08:26 PM   #108
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The rest OK. However the current capability of the above is too low
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Old 5th November 2012, 08:35 PM   #109
bobfig is offline bobfig  United States
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yah that's what i was wondering about
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Old 5th November 2012, 08:39 PM   #110
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For a few more bucks you can add two more filters and maybe DC cleaning. Its more effective than the current (ineffective) stock solution of strapping a capacitor across the bridge rectifier
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