Problem with 80W mosfet amplifier - help me please

Temptation · 13th September 2011, 07:10 PM

Hi

Can anyone help me with this circuit??

and here's the PDF version of it :
888.pdf - 4shared.com - document sharing - download

I bought this circuit as a kit but it has some hiss and noise(when no music is played) that I want to remove them from my speaker

here's the original version of this circuit :

and its site :
Simple Circuits MosFet Amplifier IRF9530 IRF530 | DIY Audio Electronic Surround Sound Home Theater System Techno News

can anyone help me??

NMOS · 13th September 2011, 07:34 PM

in my opinion poor design

IRF 9630 / 630 are not really symetrical

use QUASI NMOS 300/500 with N Channel output devices

no hiss and HIgH END Sound

Temptation · 13th September 2011, 07:50 PM

Hi NMOS

So all these noise and hiss is because of output Mosfets ??? are you sure????
Can you tell me the exact part name of this "QUASI NMOS 300/500"???

badcompany2all · 13th September 2011, 10:05 PM

Can anyone help me to remove these noises?

badcompany2all · 14th September 2011, 04:44 AM

anyone?

sakis · 15th September 2011, 05:47 PM

define if its a noise or a hiss .... hiss and noise are diferent things

hiss might be produced from a low quality IC also from poor filtering on the ic ( c1 c2 ) you might try some other alternative IC than the tl

first of all you need to try your amp with input shorted to ground to make sure that his or noise doesnt come from the source or the wiring

if noise is heard like 50 HZ you have a ground loop issue

digits · 15th September 2011, 06:12 PM

I would start with a 100nf cap from pin 4 to 7 on the IC, right on the chip.

BrianVG · 15th September 2011, 08:11 PM

Also, you can add a 'Boucherot network'

Quote:

A boucherot cell (or Zobel network) is an electronic filter, used in audio amplifiers to damp high frequency oscillations that might occur in the absence of loads at high frequencies. Named after Paul Boucherot a boucherot cell typically consists of a resistor and capacitor in series, that is usually placed across a load, for stability.

It is placed at the output of the amp and then you connect your speaker.
Also make sure that your ground-cables are as short as possible. They can work like as an antenna and pick up noise/occur oscillation.

wahab · 15th September 2011, 08:47 PM

An experimental design from ELEKTOR whose typography is instantly recognizable..
The site doesnt seems to credit this review , though...

Temptation · 17th September 2011, 06:58 PM

thank you all for your suggestions

At first I thought this hiss sound is producing from my amp (when I open this thread) but when I checked my computer's sound card with my headphone I realized that this hiss is from my computer
I ask a few friends and they said that I should change my sound card.
I wanna know that is there any way so I can remove this hiss from my computer's output????
My main board is GIGABYTE GA-EP43_DS3L and I'm using its onboard sound card.
If there's no way to remove this hiss from this sound card, can anyone introduce me a good sound card ??(without any hiss or hum or any noise)

13th September 2011, 07:10 PM	#1
Temptation diyAudio Member Join Date: Sep 2011 Location: Malaysia	Problem with 80W mosfet amplifier - help me please Hi Can anyone help me with this circuit?? and here's the PDF version of it : 888.pdf - 4shared.com - document sharing - download I bought this circuit as a kit but it has some hiss and noise(when no music is played) that I want to remove them from my speaker here's the original version of this circuit : and its site : Simple Circuits MosFet Amplifier IRF9530 IRF530 \| DIY Audio Electronic Surround Sound Home Theater System Techno News can anyone help me??

15th September 2011, 05:47 PM	#6
sakis diyAudio Member Join Date: Jan 2006 Location: nea makri athens greece	define if its a noise or a hiss .... hiss and noise are diferent things hiss might be produced from a low quality IC also from poor filtering on the ic ( c1 c2 ) you might try some other alternative IC than the tl first of all you need to try your amp with input shorted to ground to make sure that his or noise doesnt come from the source or the wiring if noise is heard like 50 HZ you have a ground loop issue __________________ SERVICE ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr

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13th September 2011, 07:34 PM	#2
NMOS diyAudio Member Join Date: Dec 2010 Location: Frankfurt	in my opinion poor design IRF 9630 / 630 are not really symetrical use QUASI NMOS 300/500 with N Channel output devices no hiss and HIgH END Sound

13th September 2011, 07:50 PM	#3
Temptation diyAudio Member Join Date: Sep 2011 Location: Malaysia	Hi NMOS So all these noise and hiss is because of output Mosfets ??? are you sure???? Can you tell me the exact part name of this "QUASI NMOS 300/500"???

13th September 2011, 10:05 PM	#4
badcompany2all diyAudio Member Join Date: Aug 2011 Location: London	Can anyone help me to remove these noises?

14th September 2011, 04:44 AM	#5
badcompany2all diyAudio Member Join Date: Aug 2011 Location: London	anyone?

15th September 2011, 06:12 PM	#7
digits diyAudio Member Join Date: Apr 2011	I would start with a 100nf cap from pin 4 to 7 on the IC, right on the chip.

15th September 2011, 08:47 PM	#9
wahab diyAudio Member Join Date: Nov 2009 Location: algeria/france	An experimental design from ELEKTOR whose typography is instantly recognizable.. The site doesnt seems to credit this review , though...

17th September 2011, 06:58 PM	#10
Temptation diyAudio Member Join Date: Sep 2011 Location: Malaysia	thank you all for your suggestions At first I thought this hiss sound is producing from my amp (when I open this thread) but when I checked my computer's sound card with my headphone I realized that this hiss is from my computer I ask a few friends and they said that I should change my sound card. I wanna know that is there any way so I can remove this hiss from my computer's output???? My main board is GIGABYTE GA-EP43_DS3L and I'm using its onboard sound card. If there's no way to remove this hiss from this sound card, can anyone introduce me a good sound card ??(without any hiss or hum or any noise)

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