Building an AUTOMATIC MUSIC BOX - HELP

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SUMMARY

The discussion centers on building an automatic music box using a nominal 12VDC gear motor with specific dimensions and performance characteristics. The motor spins at 135 rpm and draws 35mA no load, with a stall current of 1A. The user seeks advice on speed control options, specifically between a rheostat and a potentiometer, and inquires about suitable battery options, questioning the feasibility of using two 9V batteries for a 12V motor. Additionally, the user is looking for a package kit that includes both a motor and speed control.

PREREQUISITES
  • Understanding of DC motor specifications and performance metrics
  • Knowledge of speed control components such as rheostats and potentiometers
  • Familiarity with battery voltage requirements and compatibility
  • Basic skills in assembling electronic components for DIY projects
NEXT STEPS
  • Research the differences between rheostats and potentiometers for motor speed control
  • Investigate suitable battery options for a 12VDC motor, including capacity and size considerations
  • Explore available motor and speed control package kits for DIY projects
  • Learn about gear ratios and their impact on motor speed and torque
USEFUL FOR

Music composers, hobbyists, and DIY enthusiasts interested in building automated musical instruments or similar electronic projects.

nickvasallo
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Hello everyone,

I am a music composer and total noob. So please excuse my lack of engineering knowledge.

I am attempting to build a music box that can play without having to turn the gear's crankshaft manually. Here is a picture of the music box:

musical-movements-mbm30hp-sizes-big.jpg

b_5795.jpg


I have been doing some research and think I have a rough plan. Please correct me if I am wrong, I think I need a DC motor like this one:

http://www.sciplus.com/itm_photos/web40663.jpg

This nominal 12VDC gear motor measures 1-1/16" dia (1-5/16" at the gearbox) x 2-1/16" long with a 3/8" long x 3/16" dia flattened shaft. Spins at 135 rpm and draws 35mA no load, stalls at 1A. Has a 2-pin, 6mm Molex connector at the power leads.

Do you guys think this is a good motor to turn the gears? I also want to be able to change the speed so I guess I'll need a rheostat or potentiometer. Which is better and what specs do I need? Will I need to match the voltage of my motor?

What batteries are good for this? I would like to save space so if I get two 9 volts = 18V will this be too much for my little 12V motor?

Is there a good package kit that has a motor and speed control together?

thanks ahead of the help and advice!
 
Last edited by a moderator:
Engineering news on Phys.org
UPDATE, what about these?

hobbyengineering.com/H2031.html (assemble at highest gear
ratio / slowest speed)

hobbyengineering.com/H1408.html

hobbyengineering.com/H4383.html
 

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