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Old 17th July 2012, 03:55 AM   #51
naf is offline naf  Indonesia
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first step..., i've finished my board using toner transfer method.
hope this is the correct board to build this Amp.
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Old 17th July 2012, 04:31 AM   #52
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Quote:
Originally Posted by naf View Post
first step..., i've finished my board using toner transfer method.
hope this is the correct board to build this Amp.
Yep thats the correct board alright. Glad you didn't etch it as a mirror image as I did.

Regards

Simon
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Old 17th July 2012, 06:09 AM   #53
naf is offline naf  Indonesia
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Originally Posted by niss_man View Post
Yep thats the correct board alright. Glad you didn't etch it as a mirror image as I did.

Regards

Simon
Thankyou Sir, next step will carefully sourcing active component
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Old 17th July 2012, 01:51 PM   #54
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Default Electrolytic capacitor and transformer selection

This looks like really good documentation:
Quote:
Originally Posted by AndrewT View Post
30+30Vac gives ~ +-42Vdc & ~ 70 to 80W into 8r0 and suits 4ohms speaker
35+35Vac gives ~ +-50Vdc & ~ 100 to 110W into 8r0 and suits 4ohm speaker
40+40Vac gives ~ +-59Vdc & ~ 140 to 160W into 8r0 and possibly suits 6ohms speaker
45+45Vac gives ~ +-68Vdc & ~ 190 to 210W into 8r0, does not suit lower impedance speaker.

The smoothing cap voltage ratings are
>=63Vdc suit 30Vac & 35Vac
>=80Vdc suits 45Vac. . .
If I have understood this correctly, it seems that some additional derating is possible. . .
I would think that with a 28+28vac transformer (suits 4 ohm speakers, also suits small size 8 ohm speakers), one might could get away with 50v caps except. . . it could be a justifiable expense that caps directly at the bridge rectifier be more durable 63v caps since they have a harder job to do.

Likewise, with using a 35+35vac transformer along with mostly 63v caps, I would think that the caps which do the majority of the smoothing work (those located closest to the bridge rectifier) could be the more durable 80v caps for longer lasting.

P.S.
Thanks to AndrewT for documenting which transformer voltage to put with a given speaker load.
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Old 17th July 2012, 02:02 PM   #55
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you don't gain much with higher voltage caps. better to go from 85c to 105c
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Old 18th July 2012, 12:22 AM   #56
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Hmmm, the "honey badger". WOW !!
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Old 18th July 2012, 01:10 AM   #57
Bigun is offline Bigun  Canada
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Howdy!
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Last edited by Bigun; 18th July 2012 at 01:14 AM.
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Old 18th July 2012, 01:43 AM   #58
Variac is offline Variac  United States
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OMG! he's back!





Good to see you!

Last edited by Variac; 18th July 2012 at 02:03 AM.
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Old 18th July 2012, 02:11 AM   #59
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Old 18th July 2012, 02:33 AM   #60
naf is offline naf  Indonesia
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Originally Posted by ostripper View Post
Hmmm, the "honey badger". WOW !!
welcome back Sir!.
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