Introduction: DIY Spin Art Machine With Speed Control Via Common Emitter Circuit
This is an art spinner machine which is a turn table platform that spins paper and creates really cool patterns when paint or markers are applied to it. Check out the video for a neat demo and the build process.
January is a month of Birthdays and celebration! I was inspired to build this art spinner toy for my nieces up coming birthdays.
I built this out of an old computer (or power supply) BLDC fan and a cake container lid that I got from GoodWill a long time ago. The BLDC fan would serve as the spin table and the cake container lid would serve as a splatter shield and housing. The cake container had a hole in it from a previous experiment so I mounted the BLDC fan on a circular piece of wood and glued it to the bottom of the cake container to patch up the hole.
I wanted speed control to control the rate of how fast the turntable would spin, not so much that it was necessary but simply so I can play with a transistor circuit and use up some parts I acquired from a liquidated Radio Shack. The speed control circuit is a very rudimentary common emitter amplifier circuit using a NPN transtor. The bias is controlled by a 5k potentiometer and a 1k is to protect the potentiometer from burning up. Everything is powered from a 12V wall adapter (which I hoarded).
Step 1: Step 1: Refer to Schematic
For this project you will need:
- Cake container (just the lid)
- 12V BLDC fan
- 1k Resistor
- 5K potentiometer
- NPN BJT power transistor (4 amp or more)
- DC barrel connector
- DC barrel jack
- 12V AC power adapter
- plastic bottle
- hot glue
- soldering iron
Step 2: Wire Electronics Together
- Solder potentiometer to NPN transistor taking careful not of pinout
- Solder 1k to potentiometer
- Solder BLDC fan to appropriate pins on the potentiometer circuit
- Solder +12V and Gnd wires to the circuit
- Wire barrel jack to the 12V and Gnd wires
- Connect DC power and test speed control of fan
Step 3: Prep the Spin Art Machine Housing
- If the cake container does not have a flat top, cut a circular hole out of the center
- cut out a wood disc the same diameter as the hole in the cake container
- mount the BLDC fan to the wooden disk
- drill a hole in the wooden disk so a pin can be placed through in order to lock the rotor of the fan
- glue the wooden disk to the cake container so the fan is in the middle of the cake container
Step 4: Glue a Bottle Cap to the Fan
- Cut off the top of a plastic bottle
- Glue the top of the bottle (plus cap) to the axis of the BLDC fan (ensure it is well centered)
- After the glue is dry, Unscrew the bottle cap and save this
Step 5: Make and Assemble Turn Table
- Cut out a cardboard disk that is smaller than the cake container
- glue the bottle cap to the center of the cardboard disk
- attach the cardboard disk to the BLDC fan via the bottle cap (lock the rotor)
Step 6: Have Fun
Give the art spinner a whirl and try it out!
Tape a piece of paper to the cardboard turntable.
Use markers. Use paint. Have fun!
5 years ago
Actually, the fan works almost in two steps mode except when the base is arround 0.6V. I think you'll have a better control placing the fan in the emitter and connecting the collector directly to VCC. This way, the fan voltage will equal base voltage minus 0.6V.
Reply 5 years ago
Ahh like a voltage follower circuit? Thanks I will try that out.
Didn't quite understand when you mention two steps mode, do you mean two speeds?