Hi. Today I want to introduce another interesting gadget. I’ll start with the fact that I go to work by bike, my way is through a park where a lot of people. So I have long pondered loud bicycle bell. Wandering through the Internet on the resource vrtp.ru i found a scheme of the car police style siren. I really liked it and I decided to make it for myself .
Scheme is without any changes of its original I’ve added just step-up transformer for that I took from Chinese buzzer keychain.
After the bewitchment in the program EAGLE got this board:
I then developed a 3D model of of the case in the program Rhinoceros 3D
Further detail was processed in the program Mach 3 and miled from PVC using the DIY CNC from my article http://www.diygoodies.org.ua/?p=199
The body was in some places polished and painted.
The photo a set bell before compiling, fixture is taken from an old Chinese bell, but you can use the holder polypropylene tubes with a diameter of 20 from store building materials.
The set of bell for installation on the bike, I put the batteries in the bag which catches under saddle.
And as always, the video of work:
Project files in EAGLE and 3D model of of the case