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Old 23rd September 2012, 07:21 AM   #121
chokoy is offline chokoy  Philippines
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Quote:
Originally Posted by apexaudio View Post
I dont like TDA7294, but this work OK. Easy to bridge. Anybody interesting this PCB?
made this one, its working but there is a humming sound on the left channel even at low volume. what could be the problem?
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Old 23rd September 2012, 10:32 AM   #122
AndrewT is offline AndrewT  Scotland
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grounding.
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regards Andrew T.
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Old 23rd September 2012, 11:28 AM   #123
chokoy is offline chokoy  Philippines
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Originally Posted by AndrewT View Post
grounding.
thanks!
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Old 24th September 2012, 06:53 PM   #124
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it works properly or not???or is there any problm in this project?
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Old 26th September 2012, 09:10 AM   #125
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See the datasheet footnotes section where they give you more reasonable guidelines for the component values.
However, the schematics in the datasheet have problematic values listed, resulting in heat, midfi and poor bass.

At post 111 schematic, Bass Blockers include C5, C2, which are too small.
Change C5 to within the range of 47u to 100u
Change C7 to 330u//33n (nearby values work similarily)
Change C9 to 330u//33n (nearby values work similarily)
Omit C3
If R2 is 680R, change C2 to 1000u
If R2 is 1.2k, change C2 to 470u
Change C1 to 1u
Put 1 of 2u polyester cap from V+ to V-, reducing noise for cooler running.

Notes:
Gain of 70 is not valid for this chip--R2 is probably supposed to be 1.2k for the design shown.
Above, we added some bass harmonic clairty to the power circuit with the 330u caps.
Above, we have employed the newly revised bootstrap cap size guideline for better bass.
Above, we altered the NFB cap, C2, to allow bass to pass through it.
After increasing the NFB cap, we increased the input cap, C1, to allow un-hindered bass.
And we filtered noise, because LESS heat into the heatsink means more power avaiable to speaker.

If C2 is too small, bass will be "warm" "boomy" or "missing the lowest notes"
If C2 is too big, bass will be "monotony" "thuds" or "weak drums"
But, the right size will fix it.
Please report back and post when you get thunder.
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Last edited by danielwritesbac; 26th September 2012 at 09:21 AM.
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Old 29th January 2013, 05:49 PM   #126
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hello apex sir can you plz post LM3886 pcb layout in pdf file please
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Old 30th May 2013, 02:55 AM   #127
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Lightbulb PAINT

Quote:
Originally Posted by apexaudio View Post
TDA7294 Stereo/Mono connections.
Use mic cable for input.
TDA 7294 - BRIDGE: : D
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File Type: jpg BRIDGE TDA7294 SD 400%.JPG (254.2 KB, 530 views)
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Old 30th May 2013, 04:16 AM   #128
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Quote:
Originally Posted by SERGIODS View Post
TDA 7294 - BRIDGE: : D
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Old 30th May 2013, 11:51 AM   #129
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Quote:
Originally Posted by SERGIODS View Post
Nice layout, can you post the BOM?
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Old 30th May 2013, 03:45 PM   #130
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Talking Bill of Materials

Quote:
Originally Posted by nanodocl View Post
Nice layout, can you post the BOM?
The list of materials is the same as the picture soguiente (Bridge Mode)


Only a matter that holds a pen and paper, copy it on a leaf and ready.

luck
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Last edited by SERGIODS; 30th May 2013 at 03:52 PM.
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