MAKE: Blog: AVR based headphone amp

AVR based headphone amp

Lm4832 Headphone Amp
Here's an AVR based headphone amp from AVR freaks. Simonetta writes -

Headphone amp using National LM4832 audio processor that is controlled through I2C from AVR Tiny13. Unique design has one potentiometer and a single pushswitch. On power-up, the pot controls volume. On first switch press, pot controls treble. Next press, pot controls bass level. On third switch press, the pot goes back to controlling volume. The amp retains the parameter settings set by the previous switch modes. AVR sleeps between 1/15 second intervals. An AVR Tiny13 reads the potentiometer 15 times a second and creates the I2C clock and data signals needed to change the settings of the LM4832. I needed a small but loud headphone amp and was given these LM4832 samples at work. None of the old-school engineers could figure out how to control or program an I2C connection. The code shows a simple but effective way to use I2C with AVR assembler.

AVR based headphone amp - Link.

Related:
Blog Make 655
MAX - headphone amp - Link.

Blog Innards
Altoids headphone amp - Link.

Blog Tin1
Altoids and tin cases archives - Link.

From the pages of MAKE:
Make 989
Mint-Tin Amp. Pocket amplifier punches up headphones. MAKE 04 - page 141. Subscribers--read this article now in your digital edition or get MAKE 04 @ the Maker store.

Related:

Comments

Oldest comments listed first.

Posted by: fstedie on August 13, 2007 at 8:52 AM

It says you must log in to view the AVR amp. Boo!

Posted by: japroach on August 13, 2007 at 11:22 AM

It takes maybe 5 mins to create an account. Or if you don't think you will ever visit the site again, use http://www.bugmenot.com/.

hint: user/pass = bugmenott

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