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Old 20th July 2004, 03:31 PM   #1
diyAudio Member
Join Date: Jul 2004
Location: Sweden
Smile TDA2040 Amp

Hey everyone, im putting together the TDA2040 20Watt amp from this circuit schematic

Its the first time i build with chip amps and actually putting all stuff together in a little box. So i was wondering (spell?) If there is something special i shall think about when i wiring everything up. I made the circuit + preamp on a "towerboard" (not a pcb) and im using 2 4700mFD 40V capacitors. I think i shall put the chip to the box and use the whole box as a heatsink.
It would be nice to hear if someone else has done this and tell me something about it

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Old 11th November 2015, 08:26 PM   #2
Join Date: Jul 2014
Location: In from of my workbench
Bang & Olufsen will disagree with the version of the above story.

Old LX2502 Bang & Olufsen TV set, this came to the point having severe components aging problem (picture stability), and I did dismantle it for recycling, but I did kept it pair of speakers and this TDA2040 stereo amp.
This working with +/_ 20V DC it is written even over the PCB.

The plan is me to create a new power supply (just diodes bridge and transformer is what is needed).
I will combine two 12V 3A transformers, simply because I have them in my workshop.

While this project looks simple, I have to remove several unneeded components, and this will take significant time.
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Old 13th November 2015, 09:19 PM   #3
Join Date: Jul 2014
Location: In from of my workbench
My project this started moving.
Any one interested he can have a quick view here LX2502 Bang & Olufsen TV set & transformation to sound amp 2x15W 8Ohm
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Old 13th November 2015, 09:46 PM   #4
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Join Date: Apr 2008
Location: Carlisle, England
I would put the decoupling as close to the 2040 as possible.
Keep wiring as short as possible.
Use star grounding especially where power supply is concerned.
Murton-Pike Systems PCBCAD51 pcb design software.
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Old 14th November 2015, 05:04 AM   #5
Join Date: Jul 2014
Location: In from of my workbench
Originally Posted by nigelwright7557 View Post
Use star grounding

Will do, as soon I will find or make a metal enclosure for it.

Addtionaly what looks as amazing is that the specific chips they run almost frozen at my test setup with +12.5V, 0V, -12.5V .
Now I am looking to use 20V so to measure any output gain difference with my Oscilloscope.
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