Arduino Forum

Using Arduino => Audio => Topic started by: TECH GEEK on May 17, 2011, 04:31 pm

Title: The Best Op-amp Circuit for a 2.0 Speaker System w/ Stereo Output & 3.5mm Input?
Post by: TECH GEEK on May 17, 2011, 04:31 pm
What is the best "Op-amp Circuit" that....

    -A- a MP3 player's 3.5mm earphone jack
    -B- a laptops 3.5mm speaker jack
    -C- a PC microphone (external mic)
Title: Re: The Best Op-amp Circuit for a 2.0 Speaker System w/ Stereo Output & 3.5mm Input?
Post by: johnwasser on May 17, 2011, 06:03 pm
http://www.national.com/ds/LM/LM4832.pdf
Title: Re: The Best Op-amp Circuit for a 2.0 Speaker System w/ Stereo Output & 3.5mm Input?
Post by: kalum on May 18, 2011, 08:02 pm

What is the best "Op-amp Circuit" that....

  • Has stereo output & uses 8ohm speakers?

  • Has a 3.5mm audio jack input?

  • Can receive it's audio signal from...

    -A- a MP3 player's 3.5mm earphone jack
    -B- a laptops 3.5mm speaker jack
    -C- a PC microphone (external mic)
  • has adjustable volume?




Things like the supply voltage avaiable, and the method of volume control (digitally controlled? or analogue with a pot?) and the wattage of the speakers will help us to decide on your dream chip....
Title: Re: The Best Op-amp Circuit for a 2.0 Speaker System w/ Stereo Output & 3.5mm Input?
Post by: TECH GEEK on May 18, 2011, 10:45 pm
i was planing on using this:
KA324  Datasheet  (http://www.datasheetcatalog.org/datasheet/fairchild/KA324.pdf)

yes 10k pot

8ohm 0.5W speekers