!!

Welcome to our Forum, extension and content sharing platform of Electrical Test and Measurement Product Reviews Blog.

 
Registration this is Free, we accept members of 17 years old and above.  

Active since 7 June 2012  


Copyright Notice:  All content of this web site this is copyright protected. - Forum search engine this is disabled for Guests.  

Author Topic: LX2502 Bang & Olufsen TV set & transformation to sound amp 2x15W 8Ohm  (Read 2761 times)

0 Members and 1 Guest are viewing this topic.

Offline Kiriakos GR

  • Administrator
  • Hero Member
  • *****
  • Join Date: May 2012
  • Posts: 2077
  • Country: gr
    • ittsb.eu
  • job title: Industrial Maintenance Electrician
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.  ;)
WWW.ITTSB.EU   Industrial Test Tools Scoreboard  (Product Reviews Blog) / Editor in Chief.
The content of this Web site is copyright protected

Offline Kiriakos GR

  • Administrator
  • Hero Member
  • *****
  • Join Date: May 2012
  • Posts: 2077
  • 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
WWW.ITTSB.EU   Industrial Test Tools Scoreboard  (Product Reviews Blog) / Editor in Chief.
The content of this Web site is copyright protected

 

ITTSB.EU Blog Links

ITTSB.EU Home Page Our Facebook News Feed Reward us by a Donation - Sponsorship General Data Protection Regulation GDPR

ITTSB Blog Supporters - Sponsors

protosnet.com - Internet solutions M.I. Priniotakis Electronics

Recommended Links

Hellenic Accreditation System E.SY.D. Clean Up and Customize Facebook Portal of city Volos - Greece