How does one choose the right 100k potentiometer? Answered
I am building a pickup winder... a simple machine that winds hair-thin copper wire around magnetic poles.
I need to build a 12V DC geared electric motor speed controller.
I bought the following...
- 12V DC 1000RPM geared electric motor
- LCD punch digital counter with a magnetic proximity switch
- 12V Double-Pole Double-Throw (DPDT) ON/OFF/ON toggle switch
- DC12V 2A Power Supply Adapter: AC100-240V to DC12V
I know that a DC motor controller can be purchased for around $5-10, but since I am brand n00b to electronics, I want to take the opportunity to learn as much as I can by building everything (or as much as makes sense) myself. I found this Instrucable on building a DC motor speed controller. It seems simple enough, however, when I go to the Digi-Key website and look for 100k Ohm pots... there are a lot to choose from.
I do not care about form factor. I have no size restraints or aesthetics. I just need a knob... that I can turn... that will allow me to set it to zero, switch the machine on and have the motor not turn at all... then slowly begin to spin as I turn the knob up to 10, and it is spinning at its top speed (1,000 rpm).
According to the instructable referenced above, I need: an IRF3205 mosfet, a 100k ohm potentiometer, and a heatsink. I do not yet have the vocabulary to even properly Google "How to tell which 100k ohm potentiometer works with a 12V DC motor..." Can someone please point me in the right direction?