SEWA - Seven Watt Amplifier - Page 5

Mad_K · 16th February 2006, 06:24 AM

When designs are getting this many parts, it's a real aid to have a good pcb. I have designed a pcb that is really easy to make for yourself. It measures 33x100mm, single sided, and features only industry standard parts which should be easy to get in most parts of the world.

Mad_K · 16th February 2006, 07:06 AM

Assembly drawing for PCB

Mad_K · 16th February 2006, 07:07 AM

Bill of Materials

Mad_K · 16th February 2006, 07:09 AM

Drill plan

Mad_K · 16th February 2006, 07:13 AM

Here is the PSU schematic

JRKO · 16th February 2006, 10:05 AM

I cant seem to download the last .pdf. Is it just me? I see 15 others have managed

Mad_K · 16th February 2006, 10:12 AM

worked for me..

lineup · 16th February 2006, 10:06 PM

Quote:

Originally posted by JRKO
I cant seem to download the last .pdf. Is it just me? I see 15 others have managed

psu.pdf

It is possible to download.
But when opened there is an error and it does not display correctly.

Error message:
Unknown token 'b*9.89' was found.

You better make a new version.

Mad_K · 16th February 2006, 10:21 PM

Here'a e fresh one

lineup · 16th February 2006, 10:36 PM

that was better
---------------------------------

If there is one thing I should change in SEWA rev1
is the bias resistor for MOSFET.
Now R2 is VERY HIGH, 330kOhm.

I would more like to have it 33k.
This of course means increase C2 input cap to 1uF, to get same bass rolloff.

Otherwise I have not anything to complain about.
Your SEWA circuit is a very nice amplifer.

16th February 2006, 10:05 AM	#46
JRKO diyAudio Member Join Date: Dec 2003 Location: U.K.	I cant seem to download the last .pdf. Is it just me? I see 15 others have managed __________________ In the interests of full disclosure JRKO = James Rupert Kingsley Osborne. And yes, my parents will pay for it when I choose their retirement home

16th February 2006, 10:12 AM	#47
Mad_K diyAudio Member Join Date: Sep 2002 Location: Norway	worked for me.. __________________ Mads K

16th February 2006, 10:36 PM	#50
lineup diyAudio Member Join Date: Dec 2005 Location: the north	that was better --------------------------------- If there is one thing I should change in SEWA rev1 is the bias resistor for MOSFET. Now R2 is VERY HIGH, 330kOhm. I would more like to have it 33k. This of course means increase C2 input cap to 1uF, to get same bass rolloff. Otherwise I have not anything to complain about. Your SEWA circuit is a very nice amplifer. __________________ lineup

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