DIY Pocket Amplifier.

I just found a page that has instructions for building a DIY pocket audio amplifier. check it out here

Excerpt from the above page
Chu Moy designed a very popular headphone amplifier that’s easy to build, and it can be built small enough to fit in a pocket, power supply and all. It’s powerful enough to drive very inefficient headphones to thunderous volumes from even weak sources, and it sounds excellent considering that you can build a bare-bones CMoy amp for just US$20, and a pretty nice amp for under $50. Considering that the cheapest of the worthy commercial amps is $100 and most of them are in the $200+ range, this is a very worthwhile cost difference.

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I'm a self labeled Nerd who enjoys Playing Video Games, restoring classic muscle cars (i have a 65' Mustang in the works) , Running Big Data Clusters, Tattoos, Working on System Automation, Riding and customizing Motorcycles, and writing python Code. I'm an SRE with DemonWare/Activision Specializing in Big Data/Hadoop operations but all opinions and views expressed on this site are solely my own.