A while ago I came across a picture of a headphone amplifier in an Altoids tin. Even though I don’t have headphones that necessarily require an amp (Audio-Technica ATH-M50) I decided to go ahead with the build. It’s an easy enough project to build in a weekend. I followed this excellent tutorial with a few modifications. I built the single 9V battery version. I ordered all my components except the pot from DigiKey. I ordered the pot from Mouser. I still had a bunch of perfboards lying around from previous projects and used one of them. The total cost for the parts came to around $30. Unfortunately DigiKey doesn’t show you the shipping cost on checkout and to my surprise they charged me $30 for regular UPS ground shipping. I contacted their support and apparently there is a shipping cost calculator link somewhere during the checkout process. Seriously DigiKey, it’s 2015, update your website.
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