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Umeå Hackerspace is closed.
Normal opening hours are:
The above opening hours are aspirational! Check the open status indicator here on the website before dropping by, since it's not guaranteed that anyone has arrived yet. Or just ask on IRC/XMPP.
There is a semi-frequently updated schedule with planned activities here: öppetschema.
We are also listed on spaceapi, which has phone apps available. Just search for "spaceapi" wherever you get your apps, install any one you like, then search for "Umeå Hackerspace".
A Class-D amplifier made with a LM324 Op-amp, a 555 timer and a N-channel FET.
http://www.youtube.com/watch?v=HJhOOJ4qTOc
I have no idea how something this simple and cheap can sound so good, and even without any kind of filter.
Time to test out som unconventional "speakers …