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Old 3rd October 2003, 01:25 AM   #1
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Location: Illinois
Default RioVolt MP3/CD player...bad sound need headphone amp

In have the SP50 MP3/CD player from RioVolt (SonicBlue) and the sound is absolutely terrible out of it, which makes my $100 headphones sound like a $5 pair from Best Buy! So, I decided that I want to build a headphone amp for it. I found the LM4881N from National Semiconductor. It is a 200mW x 2 Boomer series headphone amp. Has anybody used one of these? Does it work well? Also, what is a good value for the resistors and caps for decent gain and no high-pass filter? I am going to run it from a 9Volt battery ran through a 7805 5V regulator.

Thanks, Mike
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Old 3rd October 2003, 01:42 AM   #2
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Location: London, Ontario, Canada
Are you listening to CD or MP3?

Those who claim to be making history are often the same ones repeating it.
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Old 3rd October 2003, 01:55 AM   #3
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Location: Illinois
I listen to a bit of both, mostly cd. the sound is crap for both
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Old 3rd October 2003, 02:05 AM   #4
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Join Date: Jun 2003
Location: Near Baltimore, MD
For the absolute best-on-the-net tutorial on DIY headphone amps there is, go to:

If you have never built a DIY amp before, his CMoy (originally designed by Chu Moy at ) amp tutorial will start you from page one, and give you a very nice headphone amp for ~$50 all out, and ~$25 if you are skimping. RatShack protoboard, Digikey hand-matched parts and a BurrBrown 2132 opamp makes a very nice little amp. You can fit it in an Altoids tin, or get fancy with a different enclosure.

His (and others - it is a group effort) high-end PPA amp project, for which he sells a PCB and also has loads of detailed instructions, will run you ~$150 - $200 in parts and will rival any solid state amp on the market.

There is a very strong DIY community at , also. Tangent is among many people who hang there and will be happy to answer any questions.

I had the right to remain silent. I just didn't have the ability. (Comedian Ron White)
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