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Chip Amps Amplifiers based on integrated circuits

TDA2040 Amp
TDA2040 Amp
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Old 20th July 2004, 03:31 PM   #1
Fritzell is offline Fritzell  Sweden
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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
Kiriakos is offline Kiriakos  Greece
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
Kiriakos is offline Kiriakos  Greece
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
nigelwright7557 is offline nigelwright7557  United Kingdom
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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.
PCBCAD51 pcb design software. 2018 version out now with lower prices >> http://www.murtonpikesystems.co.uk
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Old 14th November 2015, 05:04 AM   #5
Kiriakos is offline Kiriakos  Greece
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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