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Old 21st November 2012, 05:42 PM   #2921
stewin is offline stewin  Kenya
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hi all hoping to finish this project the amazing amp this week . my pictures
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Old 22nd November 2012, 04:09 AM   #2922
akraj is offline akraj  Bangladesh
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Thumbs up Thanks for sharing

Which version you are considering? AUD600 ver 1.1?
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Old 22nd November 2012, 07:22 AM   #2923
stewin is offline stewin  Kenya
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it is manoj's version 1.1

ucd 25 watts to 1200 watts using 2 mosfets

also this link

ucd 25 watts to 1200 watts using 2 mosfets

Last edited by stewin; 22nd November 2012 at 07:25 AM.
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Old 22nd November 2012, 07:57 AM   #2924
akraj is offline akraj  Bangladesh
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Quote:
Originally Posted by stewin View Post

Thanks for the quick reply, Stewin
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Old 22nd November 2012, 08:23 PM   #2925
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i use 1uf and 40 turn 0.8mm wire aruond the ETD29 core
in exit i have -1.5 VDC and the core have noise like hisssssssssss
input voltage befor power board is + - 25 VAC and after power it is + - 35 VDC
the power board is work good without amp board
the relay have 2 or 3 second delay
when i conect the power board to amp board the relay dont conect and dont work
some thing like protection mode
the band is plomping in first time and the relay was turn off and disconect the band frome amp
OCP LED was turn off
one of two mosfet was warm and the other one is littel warm
what is the problem ?

Last edited by Hadighorbani; 22nd November 2012 at 08:36 PM.
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Old 23rd November 2012, 05:43 AM   #2926
manojtm is offline manojtm  India
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Quote:
i use 1uf and 40 turn 0.8mm wire aruond the ETD29 core
in exit i have -1.5 VDC and the core have noise like hisssssssssss
input voltage befor power board is + - 25 VAC and after power it is + - 35 VDC
the power board is work good without amp board
the relay have 2 or 3 second delay
when i conect the power board to amp board the relay dont conect and dont work
some thing like protection mode
the band is plomping in first time and the relay was turn off and disconect the band frome amp
OCP LED was turn off
one of two mosfet was warm and the other one is littel warm
what is the problem ?
Hi Hadi,

something wrong in your amp pcb pls check once again carefully.you said -1.5v comming spk line that is why the relay(DC protect) not connect to the speaker.

regards
MANOJ
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Old 23rd November 2012, 06:11 AM   #2927
manojtm is offline manojtm  India
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Hi ALL

Now I complete the limiter board two differant designs
1. using NJM2671 IC
2. using common OP-Amp ic. it is very simple and effective.

regards
MANOJ
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File Type: pdf limiter.pdf (81.2 KB, 649 views)
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Old 23rd November 2012, 06:36 AM   #2928
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hi manoj can you please tell me what to modify to have 3.5V rms at output when input has 2V rms ? thank's!
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Old 23rd November 2012, 09:32 AM   #2929
manojtm is offline manojtm  India
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Hi Hadi,

check with this

regards
MANOJ
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File Type: pdf for first setup aud600.pdf (67.8 KB, 698 views)
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Old 23rd November 2012, 09:39 AM   #2930
manojtm is offline manojtm  India
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Quote:
hi manoj can you please tell me what to modify to have 3.5V rms at output when input has 2V rms ? thank's!
Hi ionu,

not possible for NJM2761 ic. max. 1.3v pp

regards
manoj
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