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Old 13th October 2011, 05:30 PM   #1
yakusa is offline yakusa  United States
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Default 400 watts amp advice

I saw this DIY tutorial on a spanish website, they have a very detail video instructions and since I'm not a professional i thought it would be a good project. will the toshiba 2sc5200/2sa1943 give good sound quality? would it a good idea to separate the PSU from the amp PCB? if it is, can some help me do it please. any recommendations will be greatly appreciated.

CONSTRUYA SU VIDEOROCKOLA.COM > Construya un amplificador de 400w
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Old 13th October 2011, 05:40 PM   #2
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Default simpler amplifier 500 watts

hi yakusa
greetings better to make B500 by apex audio same output transistors
same dc supply voltage compact pcb and amplifier project is well documented
and most of all its tested design with good sound
warm regards
andrew lebon
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Old 13th October 2011, 06:07 PM   #3
AndrewT is offline AndrewT  Scotland
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The schematic style seems familiar.
Is this the work of Bora?

4pair of 1943/5200 running off +-70Vdc seems to be far short of 400W capability.
1943/5200 have very poor high voltage SOAR after temperature derating.

Note: that the BOM shows much more robust output devices that have far higher high voltage SOAR. Note particularly that the MJ are To3 250W devices rated for duty upto 200degC. Without doing the arithmetic the MJ could be used for a 4ohm reactive load and achieve that 400W into 4r0 target.
Whereas the 1943/5200 would probably be Ok for 8ohm loading and a target output of 200W to 250W into 8r0.
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regards Andrew T.

Last edited by AndrewT; 13th October 2011 at 06:13 PM.
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Old 25th October 2011, 06:28 AM   #4
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andrew
i think it was'nt from dr. dora,
check this site
schematic is 400w power amplifier
New Page 1
bottom left you can see link leads email to lumanaw,(is he the one of our moderators?)
lumanauw@bdg.centrin.net.id

Last edited by engel dela pena; 25th October 2011 at 06:30 AM.
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Old 26th October 2011, 11:12 PM   #5
yakusa is offline yakusa  United States
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Sorry, this is the right schematic. the website recommended to to bigger caps so i chose the 10000 uf
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Old 26th October 2011, 11:19 PM   #6
yakusa is offline yakusa  United States
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a couple of pics.
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Old 27th October 2011, 12:38 AM   #7
mihailo is offline mihailo  Serbia
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Very nice. Can you share PCB with us, please?
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Old 27th October 2011, 02:16 AM   #8
yakusa is offline yakusa  United States
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I have the PDF file but its in spanish.

Click the image to open in full size.

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Old 27th October 2011, 03:52 AM   #9
Francec is offline Francec  Australia
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yakusa,
Why do you need 400 Watts? Do you have very inefficient speakers or have to fill a hall with sound?
The voltages needed to produce that much power can hurt badly, probably terminally, so, unless you really need that power, you might start with something a little less ambitious............................and dangerous.

Frank

ps Mods, this should be in the SS forum.
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Old 27th October 2011, 09:44 AM   #10
mihailo is offline mihailo  Serbia
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I have found PDF on net, will try to build it. Thanks.
Few more questions, is the amplifier stable? Have you tested it? Have you tried it at 4 ohm?
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