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Old 1st March 2012, 08:54 AM   #1711
manojtm is offline manojtm  India
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Hi All

I will give a good schematic for Bridge AMP. PLS Wait.............!!!!!!!!!
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Old 1st March 2012, 10:47 AM   #1712
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Default BAFFLED

Hi
greetings can any explain my problem i have assembled egtagle orignal ucd amp on his orignal pcb i have no issues with amp its working well strong output
supply is 36 volts ac transformer dc rails are approx 50 volts dc on supply rails are 1uf 2 caps on each rail then i designed pcb for sameerx1 only thing i added was .1 and 470uf on each rail and same 1uf 2 caps on each rail AMP playing ok
on 24 volt ac trafo but as i switch to 36 volt ac trafo amp blows within seconds
can any one tell me whats the reason its very important for me to know the reason so i can progress further in DCLASS
warm regards
andrew lebon
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Old 1st March 2012, 12:49 PM   #1713
norazmi is offline norazmi  Malaysia
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Quote:
Originally Posted by irvynejay View Post
Hello can i ask some newbie question could i use this mosfet on class d amp
IXFX30N100Q2 and IXFH15N80
Both mosfet u post is NO. Not suiteable and too much Rds-on and others etc etc.. Dont try it with that mosfet. bad idea
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Old 1st March 2012, 12:52 PM   #1714
norazmi is offline norazmi  Malaysia
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Andrew, please more specified, what output mosfet u use? gate resistor? Aux transistor? and last 36 vac will produce more than +/- 50 vdc after rectified. and whats is blown? output mosfet?
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Old 1st March 2012, 02:20 PM   #1715
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Default THANK YOU FOR REPLYING

Hi Norazmi
greetings thanks for your helpful replies d class very new to me
1 MOSFETS irf250n with gate resistors 27 ohms just finished testing egtagles
orignal pcb with 55 volts dc rails working good i think 60 volts dc is max limit
for IRFP250N using mje13007 instead of TIP 41 resistor 6.8k 1 watt getting about 11.8 volts dc on emitter of mje now on new PCB on supply rails i only added 470 uf 100 volts and .1 cap in addition to the 2 1uf 100volt caps on each rail components DAMAGED
12 IR2110 gone GATE DIODES BLOW i am using in5819 anyways thanks for your help
and keen interest I think my pcb design is not good maybe thats reason for
amp blowing up so many times sometimes we have to learn the hard way but i am learning something and that counts for me ill keep trying
warm regards
andrew lebon
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Old 1st March 2012, 02:20 PM   #1716
CPX is offline CPX  Romania
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andrewlebon:
Probably bad pcb design...post a picture with it!
Everybody burn parts..is something normal when high power design is concerned.
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Old 1st March 2012, 02:33 PM   #1717
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Default thank you sir

Hi CPX
greetings also thanks to you i will do THD and IMD measurements just
busy its exam time here the new pcb was designed for my student sameerx1
i know dclass pcb has to be designed with care and many considerations next time i will be more careful good to know many helpful people in this d class thread
warm regards
andrew lebon
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Old 1st March 2012, 02:35 PM   #1718
CPX is offline CPX  Romania
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Ok..good luck with your exams!
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Old 1st March 2012, 05:19 PM   #1719
norazmi is offline norazmi  Malaysia
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Coffe time all

p/s - watch my fully discrete class D amp here : Fully Discrete Class D UCD Amplifier +/- 50vdc - YouTube
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Old 1st March 2012, 08:29 PM   #1720
CPX is offline CPX  Romania
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norazmi...distorsion testing time.
If you can please make some THD and IMD tests at 1A,5A and 10A 1 ohm and 4 ohm load...
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