- Like
- Digg
- Del
- Tumblr
- VKontakte
- Flattr
- Buffer
- Love This
- Odnoklassniki
- Meneame
- Blogger
- Amazon
- Yahoo Mail
- Gmail
- AOL
- Newsvine
- HackerNews
- Evernote
- MySpace
- Mail.ru
- Viadeo
- Line
- Comments
- Yummly
- SMS
- Viber
- Telegram
- Subscribe
- Skype
- Facebook Messenger
- Kakao
- LiveJournal
- Yammer
- Edgar
- Fintel
- Mix
- Instapaper
- Copy Link
Spotted in the MAKE Flickr pool:
Flickr user Lucky Larry built this shakeable dynamo using a few rare earth magnets and a bit of wire. If you’ve been wondering how to make one of these, he has a a four part series, which covers everything from how to wind the coil to how a bridge rectifier works.
4 thoughts on “DIY flashlight dynamo”
Comments are closed.
He uses a ‘1n004′s’ (possibly 1N4004?) – a regular diode will have about 1V forward drop. Better choice would be a Schottky diode 1N5817 (1A / 20V), which has a 450mv drop.
Doesn’t seem to use any sort of ‘holding’ capability – stop shaking and the light stops – possibly could use a 10uf electrolytic to buffer up some of the charge. Might give a bit of extra glow after the shaking stops.
Mike Y
Dallas, Texas
Good point about the diodes! I think he is working on a way to add some storage capacity next, it really isn’t very useful as a light source in it’s current form :-).