Introduction: Bike Speakers Mk12
well, after a few attempts i think ive cracked it :)
Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.
Step 1: Making the Mold Plugs
i'd never done this before but it turned out easy enough, the old speakers are in the pic to give an idea of the size upgrade
Step 2: Making the Molds
use beefy ply for the tongue, otherwise it will flop about
Step 3: Fiberglassing
im not going into the ins and outs on fiberglassing, its on the net ;)
the sheets were made by applying fiberglass to an old mirror, be sure to use lots of polish to release it
its made to split down the middle
dont do what i did.. leave it on the plug for a couple of days to harden fully otherwise it with deform later
Step 6: Molds Made
i used a bit of filler along the join to fill the crack..
Step 7: Missing Steps :(
im making this and realizing ive lost half the photos :( so the stages jump quite a bit, if i find the photos ill add them
but here ive used the molds to make these..
to thicken the fiberglass resin i added kiln dried sand to the mix, this makes it thicker and able to fill gaps and it sets rock hard, the tongue part is simply glassed to the rear of the moulding
again, essential photos missing :(
but the holder was made from 3 layers of ply and bits i had lying around and the speakers fit snuggly in the slot
be sure to dowel the layers
Step 9: Electronics
i used a nice audio board off ebay for 20 quid, its 25w rms x2 at 4ohms, so i bought my favorite dayton audio nd-91/4's these really bounce about:)
and i built in a bluetooth headset so its wireless to my phone (again with missing pictures because im useless)
Step 10: Batterys
i used batts from an old power drills with a few dead cells and made up a battery pack, these last about 6 hours at almost full volume
Step 11: Paint
the first set had gold paint, but it looked a bit much to be honest, so ive been playing with an airbrush..
the later sets had no battery monitor (didnt need it anyway)
but i did add a usb charger:)
again, sorry about the missing steps, but i think they're covered in the other bike speaker sets ive made and posted on here.
any questions just ask x