My first DIY amps

Rightbrained · 17th November 2009, 08:55 PM

Hi all ,
I just finished 3 amps using the TDA8950 modules from cnx. I am really impressed with the sound quality and they seem to have loads of headroom with my 4 ohm diy speakers
I played them gently for the first few hours and then pounded on them for the duration of Transformers 2. They never got hot.
The case is comprised of mdf covered with oak veneer for the front and sides and .050 2024T3 aluminum for the bottom , top , and back.

The only problem I have is a high pitched pop when I power the amps up. Crisit suggested a 4.7 to 22uf cap between signal ground and the mode pin but that didnt help. Any suggestions?

Here are a few photos.

zog666 · 18th November 2009, 08:52 PM

Wow nice!

I have an amp based on the Connex TDA8920 module (similar but lower power I guess?) and am very happy with it... I don't have any power on sound but there is a slight click turning the amp off.

I have found using a power use meter that the idle power consumption of the amp is negligable... and it runs very cool, so its perfect for just leaving powered on in the loungeroom 24/7.

Rightbrained · 18th November 2009, 08:55 PM

zog ,
I have had the same idea as well. These modules use very little power at idle.
I am hard headed though and want to be able to stop the noise.

Kjeldsen · 9th April 2010, 10:01 AM

Quote:

Originally Posted by Rightbrained

zog ,
I have had the same idea as well. These modules use very little power at idle.
I am hard headed though and want to be able to stop the noise.

I have the same problem. Did you find a solution. I haven't tried the capacitor trick yet. Cris have recommended up to 220 uF to me.

Rightbrained · 9th April 2010, 07:25 PM

I never did get rid of the pop and cristi stopped responding to my emails. The amps do sound good regardless.

Ar4 · 3rd May 2010, 07:10 PM

Rightbrained, do you used double layer pcb?

17th November 2009, 08:55 PM	#1
Rightbrained diyAudio Member Join Date: Aug 2008 Location: Dothan ,Al.	My first DIY amps Hi all , I just finished 3 amps using the TDA8950 modules from cnx. I am really impressed with the sound quality and they seem to have loads of headroom with my 4 ohm diy speakers I played them gently for the first few hours and then pounded on them for the duration of Transformers 2. They never got hot. The case is comprised of mdf covered with oak veneer for the front and sides and .050 2024T3 aluminum for the bottom , top , and back. The only problem I have is a high pitched pop when I power the amps up. Crisit suggested a 4.7 to 22uf cap between signal ground and the mode pin but that didnt help. Any suggestions? Here are a few photos.

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18th November 2009, 08:52 PM	#2
zog666 diyAudio Member Join Date: May 2009	Wow nice! I have an amp based on the Connex TDA8920 module (similar but lower power I guess?) and am very happy with it... I don't have any power on sound but there is a slight click turning the amp off. I have found using a power use meter that the idle power consumption of the amp is negligable... and it runs very cool, so its perfect for just leaving powered on in the loungeroom 24/7.

18th November 2009, 08:55 PM	#3
Rightbrained diyAudio Member Join Date: Aug 2008 Location: Dothan ,Al.	zog , I have had the same idea as well. These modules use very little power at idle. I am hard headed though and want to be able to stop the noise.

9th April 2010, 07:25 PM	#5
Rightbrained diyAudio Member Join Date: Aug 2008 Location: Dothan ,Al.	I never did get rid of the pop and cristi stopped responding to my emails. The amps do sound good regardless.

3rd May 2010, 07:10 PM	#6
Ar4 diyAudio Member Join Date: Apr 2010 Location: Latvia	Rightbrained, do you used double layer pcb?