[Simon] wrote in to tell us about a headphone tube amp that he just built. It is based on schematics at diyaudioprojects.com that were actually featured on Hackaday in the past. [Simon’s] design adds ...

Onkyo has launched a DIY headphone amplifier kit for hobbyists. The kit is available in Japan for 44,000 Yen (~$300) from the Kyoritsu Electronics Shop. Each unit is made to order and can be ordered ...

I'd like to monitor the amount of power (in watts) going into my speakers. I'm not concerned about over driving them or anything, I'm just curious how much power I'm actually using. I connected a volt ...

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While this op amp may actually have some utility, it is intended mainly as an educational exercise. I guarantee that if you build and experiment with this circuit, you will learn and appreciate what ...

December 20, 2009 Add as a preferred source on Google Add as a preferred source on Google If you're looking for a super-cheap way to squeeze some extra performance out of your guitar amp, this simple ...

On the day mini-amps were invented, electric guitar players the world over rejoiced. No longer would they be house-bound when jamming out on their favourite guitar. It is a doubly wondrous day indeed ...

As soon as I have a work bench area, I’m going to start getting into this stuff. The idea of having a headphone amp that I put together all by myself is incredibly attractive to me for some reason.