ITTSB.EU Blog Forum

ITTSB Blog Specific => ITTSB - Small projects by Kiriakos & User reviews => Topic started by: Kiriakos GR on November 11, 2015, 09:18:16 PM

Title: LX2502 Bang & Olufsen TV set & transformation to sound amp 2x15W 8Ohm
Post by: Kiriakos GR on November 11, 2015, 09:18:16 PM
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.  ;)
Title: Re: LX2502 Bang & Olufsen TV set & transformation to sound amp 2x15W 8Ohm
Post by: Kiriakos GR 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