[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 ...

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 ...

MAKE refers us to the best use of a Marlboro pack since, well, its intended one. For under $30, you can build your very own amp, complete with input and headphone jacks, right into your old box of ...

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 ...

I have access to one of the largest collections of vintage USA-made tubes. From the expertise you all have, what would be the best sounding tube amp I could possibly make? I have a great deal of ...

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 ...