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Author Topic: LX2502 Bang & Olufsen TV set & transformation to sound amp 2x15W 8Ohm  (Read 5103 times)

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Online Kiriakos GR

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I got my self in to a new project.  :)

From an old LX2502 Bang & Olufsen TV set I did salvaged it lovely pair of speakers and the sound amplifier PCB.
This have two TDA2040 them working with +20V, 0, -20V , now I have to recreate the missing PSU by adding two single 12V 3A transformers in series and a diode bridge.

While this project seems simple, everything is there, I will have to remove several unneeded components from this PCB.
The good news is that I am aware that I have a good to go amp, but I will test all capacitors with my DE5000 LCR, just in case / verification.

Soon I will add more pictures as this project will move ahead.  ;)
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Online Kiriakos GR

  • Administrator
  • Hero Member
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  • Join Date: May 2012
  • Location: Greece
  • Posts: 2203
  • Country: gr
    • ittsb.eu
  • job title: Industrial Maintenance Electrician
Re: LX2502 Bang & Olufsen TV set & transformation to sound amp 2x15W 8Ohm
« Reply #1 on: November 13, 2015, 09:08:27 PM »
With a big smile at my face I am reporting good news !!  8)

I did manage to test this sound circuitry and to note down both channels Audio Input / Output points.
Added all cables for speaker connectors, and tomorrow I will add permanent Audio input connectors.   
Temporally I did use a 12V battery and my  DC power supply in combination.
So to simulate this needed +12 , 0V, - 12V voltages for a quick test.

And the major Fun part started when hooded my GDS2102A as VU meter at the output of the speaker when this was playing music ,  never tried that all these years.  ;D
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