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Rotating monitor - Yet another take

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weisshaupt:

--- Quote from: southpaw13 on April 12, 2008, 05:28:55 pm ---Ok, the initial building is going fine.  I am running into problems with the power.  I am sure 5v will be too much for me.  I know I can get 5v and 12v out of my computer plug, but how do I take it down to 1v or 2v or even lower?  I tried a 1.5v battery and was very happy with the results.  I think I can use a resistor, but which one or is there another way?  How about a speed controller than runs on some type of variable adjustment.  Please help, this is where I am limited....I actually want it to run pretty slow so that it doesn't bounce off the switches....

Thanks,
Southpaw

--- End quote ---

USE Pulse Width Modulation to turn the motor on and off rapidly. You won't be able to get a reliable result from a resitor without building a Transistor based feedback circuit. If you insist on doing it in hardware use a 555 timer circuit (there are dozens of examples on the net)  but otherwise you are better off doing it in Software using my (or someone elses) program. 

psychotech:
Or you could just buy a variable voltage transformer, something like this: http://www.maplin.co.uk/Module.aspx?ModuleNo=96864&doy=14m4&C=SO&U=strat15

Should work just fine (I'm using one at the moment on mine running 4.5V to the motor, works nicely on 3V also..)

hope this helps :)

southpaw13:
Yes, I got the same idea at Radio Shack...Now I just need to test it....

Thanks...

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