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Old 13th September 2006, 06:22 PM   #21
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The LM338 looks like the best bet then. Get one in the TO3 can and put it on a decent heatsink, as the most likely easily available trannie for that current will be 9V.
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Old 13th September 2006, 06:58 PM   #22
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Default seconded ...

gsuser: " ... I want to build a new linear one. ..."

pinkmouse: " ... [and get an LM338 in a] TO3 can and put it on a decent heatsink ..."

Seconded, passed by the quarum and put in the out box ... now get to work ...
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Old 13th September 2006, 08:14 PM   #23
gsuser is offline gsuser  France
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Thanks
Any advice for the other components values in this shematic ?
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Old 13th September 2006, 08:34 PM   #24
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You would only need the top half, the part with the LM317. You can also use the LM338, but i don't think you need the headroom.

I have a Roku soundbridge with a Meanwell smps with some filter caps. A slight improvement, more discernable with headphones. Probably going linear would have more positive results. All the best.

Chuck.
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Old 13th September 2006, 08:36 PM   #25
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oh i forgot!

http://www.muzique.com/schem/lm317.htm
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Old 13th September 2006, 09:23 PM   #26
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Here's one I made earlier. Set R1 and R2 as per angchuck's link.
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Old 13th September 2006, 09:45 PM   #27
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Default That snubbing cap ...

... at C4 is a great idea = stabilizes the voltage reference.

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Old 14th September 2006, 07:16 AM   #28
gsuser is offline gsuser  France
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OK, thanks, it's more precise for me now.
It will be Pinkmouse's shematic, with his recommandation of the LM338 in a TO3 can. Angchuck'link gives me 220 Ohms for R1, and 660 Ohms for R2 withe the LM317. Will it be the same for the LM338 ?
Can you help me with the choice of the transformer ? toro´dal or other ? 9V 25VA ?
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Old 14th September 2006, 03:04 PM   #29
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Default close to prefect ...

... I would be quite satisfied with one of these myself.

" ... It will be Pinkmouse's shematic, with his recommandation of the LM338 in a TO3 can. Angchuck'link gives me 220 Ohms for R1, and 660 Ohms for R2 withe the LM317. Will it be the same for the LM338 ? ..." Yes, similar circuits / chips that use the same basic resistor ratios.

" ... Can you help me with the choice of the transformer ? toro´dal or other ? 9V 25VA ? ..."

Preference would be the torridal type, but there is a plathora of "standard" transformers to chose from. Your target voltage should closely match the specifications for best results from the LM338 = 9 to 15 VDC from the diode bridge (Vin for the LM338) ... so a 9 Volts AC secondary times 1.414 ~= 12.xx volts (the peak voltage from the diode bridge = input AC volts times square root of 2 ~= 1.414 [... which would make this an almost ideal 12 Volt battery charges as well]).

As for the transformer power rating, I like a two to one safety ratio (others may have other preferences) ... so, output power = volts DC times current = 5 VDC times 2.x Amps ~=12 to 14 Watts ... times two for safety and lower heat ~= 25 Watts = 25 VA.

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Old 14th September 2006, 03:49 PM   #30
gsuser is offline gsuser  France
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Thanks for these precisions, FastEddy, I can now begin. I'll post a picture when done
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