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Chip Amps Amplifiers based on integrated circuits

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Old 22nd May 2013, 08:04 PM   #11
PetruV is offline PetruV  Romania
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Quote:
Originally Posted by ivanlukic View Post
Yes. They cost 3 euro each from Kelco in Belgrade, name of the kit is RK2003.
Theyre pretty cheap,ours are more expensive,also you need more filtering caps
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Old 2nd June 2013, 09:06 AM   #12
PetruV is offline PetruV  Romania
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Now Post some images,guys,and maybe some opinions and recomandations
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Old 8th June 2013, 04:12 PM   #13
PetruV is offline PetruV  Romania
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Guys, i need help,my tda2003 amp makes a distorsion sound at loud volumes on one channel,but if i unplug it,for the 15 sec it runs on the smoothing capacitor,it sounds clean ,it triggers into this state at loud volumes,and can be reset by powering off,I need some help.Could it be because over temperature.It sounds as if its clipping with the bass,but like its only on one chanell and the clipping can be heard if i turn the amp down.
Could it be short circuit protection?it did this on an 150ma charger,but now i ugraded to a 4amp supply and still does this.
Please help me,the chip involved in the broken channel is a tda2003av,the other channel is a possibly fake[?] utc2003,but its not causing the problem
Thanks in advance ;D
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Old 9th June 2013, 05:33 PM   #14
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do you have the photo of your current TDA2003 amplifier ... post it over (make sure to take the picture top and bottom part of the PCB) ... and also the exact schematic you were using as well ... maybe i can help ...

The Names of the IC might not be a fake ... it is maybe from a different manufacturer uses different prefixes for it ... so many times i encounter for different types of ICs and transistor but end up doing the job it suppose to do with no problems at all ...
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Old 9th June 2013, 07:54 PM   #15
PetruV is offline PetruV  Romania
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Thanks,but it was just a wire being loose and tremblling with the bass,which probably reconects because of vibrations on switch off.Thanks anyways for the last line.
If you can post your pictrures of your tda2003 builds
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Old 10th June 2013, 03:40 AM   #16
Mihkus is offline Mihkus  Estonia
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Click the image to open in full size.
how to do a screen shot

I dont have pics of the amp itself but what i did...
I needed superbly slick and thin amplifier that fitted inside case that was 23mm x 120 x 185mm
I made it almost 2 years ago or so, the design of the board is horrible.
It had PCB2706 DAC and digital volume control, switching power supply (modified laptop charger)

Last edited by Mihkus; 10th June 2013 at 04:01 AM.
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Old 10th June 2013, 07:45 PM   #17
PetruV is offline PetruV  Romania
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What kind of modifications did you do to the smps to be better,and in which way?
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Old 11th June 2013, 10:07 AM   #18
Mihkus is offline Mihkus  Estonia
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Just rewound output transformer primary.
Less wounds to get a bit over 14 volts bigger filter to get sqw clean.

I built pair of OB fullrange speakers with FR10-4 from visaton

The DAC and volume control were powered by USB 5V

DAC had serious problems with noise until i replaced most of the caps that were probably fake elna ****... nasty stuff from ebay may cause illnesses

I was gift for my mom...
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Old 11th June 2013, 08:47 PM   #19
PetruV is offline PetruV  Romania
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I did that to a normal line voltage transformer,i removed windings from secondary ,it a ads a lot of power to my tda2003 amp,but it kinda buzzes and gets hot,even when idling,but it seems as the winding stay cold but the core EI gets hot.I would need some help regarding the max recomanded temperatire for a transformer,line frequency is 50hz.
Thanks for the answers!
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Old 12th June 2013, 02:15 AM   #20
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how loud was the transformer buzzing then ....?? if it just a faint buzzing close enough to the transformer to hear it then it is normal
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