bike speaker

It's completely powered by a dynamo hub generator... completely off-grid bicycle powered 'fun box.' Puts out plenty of sound for a scrapy speaker... I already got an 8" 2-way speaker in the mail for the next generation sound system.... soo much fun to have sound blasting up at you instead of through your ear buds ... much safer too!

inspired by a derailleur sound system from specifications from Dan in Oakland

One month ago a weekend of bike events called 'Freak bike fall'  was happening and there was a nicely sized LOUD sound system running on 24 volts and I was told it was only pulling 1/2 amp by this likable character that called herself agent flux...


...and I thought out loud, "Damn I can run that off my Dynamo-Hub... 

... I was definitely not 100% sold that it was all only pulling 1/2 amp and I wasn't carrying an amp meter on me soooo....

I decided to start small and this is the 1st generation $2 speaker and the dynamo power goes right to the amplifier and blows it away....

Step 1 So first I ordered some parts

Amplifier: Sure Electronics 2x15 watt TA2024  for $22

Crossover: Monkeylectric monoXover for $15

I already had a dynamo hub: Shimano DH 3N71 ... they are all pretty much the same, 6 volt / 3 watt

AC to DC 'bridge' qty(4) 1N5818 Diodes $0.29 each

Comments

[andytetmeyer]

so even though the dyno is 6v, it is enough to power the amp?
-andy

[nkosuge]

Impressive! I'm going to have to get you to help me with one of my future builds. ;)