Random electronics Q
 

What's the name of this part?:

it's like a little arm or piston that moves in and out with varying voltage, like a motor but instead of rotating around, this moves in and out.

Re:Random electronics Q
 

a valve or a soloniod?

Re:Random electronics Q
 

a relay or solenoid.

Re:Random electronics Q
 

actuator?

Re:Random electronics Q
 

Gerald wins..Ding,Ding,Ding!

Thats exactly what it is.

Re:Random electronics Q
 

If you're referring to the little pistons like they use in automated car audio setups, those are linear actuators.

Re:Random electronics Q
 

servos?

Re:Random electronics Q
 

racerex is right, its a linear actuator, it varies in length either in or out as the voltage changes. I've used some before for some sick ass motorized amp racks and shizzle.