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Old 21st June 2007, 05:53 AM   #1
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Default power amplifier 400w @ 4 ohms

Hi, this amplifier im building, but have problems.

The transistor is blowing...any of you guys can help me out?

Thanks....
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Old 21st June 2007, 06:38 AM   #2
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Need more details...such as 'what amp?' Can you post a schematic?
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Old 21st June 2007, 10:05 AM   #3
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which transistors are blowing?.. is it the driver or output stage?..

for the output stage,check those 2 IN4004 bias on 2 driver transistors.. it may be open..

and those vrail are too high that could burn your amp.. this design are more in our country and i really dont like it..

i have this amp before and keeps me in trouble..you may refered to the other design made by our fellows here.. try those leach amp and others..

try this..this is simple and easy to build..
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Old 21st June 2007, 12:18 PM   #4
geminni is offline geminni  Yugoslavia
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Clovi_kate, i must inform you that you post a schematic which have beep posted by someone who had some fault! There is dc voltage on spk out!

I'm also building that amp these days. People say that it is stable and good sounding, but ignore those voltage in red
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Old 21st June 2007, 02:53 PM   #5
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Default i am interested too

looks very simple and powerfull ...this m250 has anyone built this ??? can you tell more about performance ???
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Old 21st June 2007, 03:37 PM   #6
teemuk is offline teemuk  Finland
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Default Re: i am interested too

Quote:
Originally posted by sakis
looks very simple and powerfull ...this m250 has anyone built this ??? can you tell more about performance ???
http://marcusgun.com/elektronik.html

http://www.diyaudio.com/forums/showt...1642#post51642
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Old 22nd June 2007, 01:34 AM   #7
djk is offline djk
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The 'C' version of the TIP 41/42 can handle no more than +/- 50V
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Old 22nd June 2007, 03:38 AM   #8
jaycee is offline jaycee  United Kingdom
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At this kind of power I would consider a MOSFET amp... also, if this is for domestic use, do you *really* need 400W into 4 ohms?
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Old 22nd June 2007, 06:54 AM   #9
geminni is offline geminni  Yugoslavia
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M250 is rated 250w @ 4ohm, which is enough for any standard hi-fi speaker. Add anodher 250w for second channel and you have 500w for home music (or video)
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