How can I hook up a three volt motor to a 9 volt power supply without frying it?

Because you are new to electronics, the simple and cheap way to do it is with one of these: sparkfun.com/commerce/product_info.php?p... This is a 3 pin voltage regulator, called the LM7833. It is widely available and very cheap. Your local chip shop will have it.0 volts (ground) on pin 1.

This goes to both your input ground and your motor ground. Pin 3 is where you wire up your 9 volts. Pin 2 in the middle goes to your motor, feeding it a stable 3.3 volts.

The extra .3 volts won't harm things because they rate motors with a bit of lee way. It will just give it a little bit more power. Farso mentioned the LM317 voltage regulator which I somewhat agree with.

This provides a variable voltage. It has the advantage that you can decide how much voltage you want to output. The problem I see with it is that it also requires a circuit to be built around it to tell it what voltage you want from it.

Because you are uncertain about electronics I would suggest you go for the LM7833, all in one package solution. There are circuits you will find which add capacitors to this as well, which provide a more stable 3.3 volts. This may be important if you are running other chips from that power supply, but for the DC motor you are using it won't matter.

Good luck with your project :).

There's two possibilities to do this: 1. You could use two resistors in order to create a potential divider, possibly how you are doing with the pot, but this depends how you have wired it up. 2.

This is the option I would choose. I would use a LM317 voltage regulator in order to produce a good voltage source for the motor. Hopefully this would get rid of most of the voltage ripple you would get from switching the motor.

The fact that turning the pot only makes it turn on at a certain point makes me think there is something up with either the pot or the motor. Could you check the pot w/ a volt-o-meter to make sure it works? If it is working fine, could you post more specs on the motor?

User a 3 volt battery (2 x AA) or a 9 volt motor.

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