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Old 03-12-2011, 11:36 PM #1
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Default HELP with power supply for spyrograph

Well I finally finished my 4 motor laser spyrograph build. Here are some pics:





I used 4 DC motors 1.5V-3.0V, 4x25 Ohm rheostat pots, 4xDPDT switches (3A rated), and a 50mW green module (2.9V-3.0V)

So I thought I could use this DC adapter to power it:



It provides 1A and I can select how much voltage.

Now the problem. It works with 1 and 2 motors fairly well but powering up a 3rd or 4th motor bogs it right down. It goes dim and even goes out. If I slowly power up the 3rd/4th motor it will go dim but not out. As the motor is gaining RPM's it's dim but once it reaches it's set speed, determined by the pot, it gets brighter again.

I hope all that makes sense.

So, am I not getting enough current?


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Old 03-12-2011, 11:45 PM #2
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Default Re: HELP with power supply for spyrograph

Your power supply cannot support the load. You need a higher current output supply.
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Old 03-12-2011, 11:50 PM #3
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Default Re: HELP with power supply for spyrograph

Is everything wired in parallel from the same source?
Then yeah, probably not enough current.
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Old 03-12-2011, 11:53 PM #4
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Default Re: HELP with power supply for spyrograph

Have you tryed just powering 3 and 4 only to see if maby there is something not right with them ?
If they work corectly then you need more current you could try moving the selector switch to the next higher voltage and see how that works.
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Old 03-12-2011, 11:57 PM #5
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Default Re: HELP with power supply for spyrograph

Quote:
Originally Posted by Coherent Light View Post
Your power supply cannot support the load. You need a higher current output supply.
Thank You!!
Quote:
Originally Posted by anselm View Post
Is everything wired in parallel from the same source?
Then yeah, probably not enough current.
Yes, and Thanks!!

Quote:
Originally Posted by Flaminpyro View Post
Have you tryed just powering 3 and 4 only to see if maby there is something not right with them ?
If they work corectly then you need more current you could try moving the selector switch to the next higher voltage and see how that works.
Thanks FP, I did try that as well. Also tried 4.5V but it seemed to make it worse. So more current it is.

So what would be a good current? 2A?
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Old 03-13-2011, 12:02 AM #6
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Default Re: HELP with power supply for spyrograph

Yes, what Coherent said.
Your motors are probably using more than 250mA each. Try a power supply with at least 2A.
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Old 03-13-2011, 12:07 AM #7
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Default Re: HELP with power supply for spyrograph

Quote:
Originally Posted by Ash View Post
Yes, what Coherent said.
Your motors are probably using more than 250mA each. Try a power supply with at least 2A.
Sweet, thanks again everyone. That is an easy fix. But here is another question, What would it take for batteries to power it for around 1 hour?
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Old 03-13-2011, 12:46 AM #8
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Default Re: HELP with power supply for spyrograph

A 18650 or two spring to mind.
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Old 03-13-2011, 03:20 PM #9
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Default Re: HELP with power supply for spyrograph

Here's a wild idea. Instead of making several assumptions, measure the draw of each of the components at full power, then make your supply selection.
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Old 03-13-2011, 04:28 PM #10
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Default Re: HELP with power supply for spyrograph

Quote:
Originally Posted by Cyparagon View Post
Here's a wild idea. Instead of making several assumptions, measure the draw of each of the components at full power, then make your supply selection.
Wow!! Thats nuts!! Kinda crazy alright, but I'll give it a try.

All sarcasim aside, thanks Cyparagon.
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Old 03-14-2011, 10:59 AM #11
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Default Re: HELP with power supply for spyrograph

And don't increase the voltage of the psu to try to get them to work, you may blow up some components when the load is lower.
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Old 03-14-2011, 12:28 PM #12
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Default Re: HELP with power supply for spyrograph

So I tried measuring the load on 1 motor at full speed and as soon as I touch the leads to the motor terminals, it makes everything stop. It's like the DMM is putting such a load on the power supply it just shuts down.
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Old 03-14-2011, 12:42 PM #13
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Default Re: HELP with power supply for spyrograph

You're measuring current by breaking the circuit and putting the meter between the broken leads to make it a part of the circuit... right? An ammeter is a very low resistance device.
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Old 03-14-2011, 12:47 PM #14
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Default Re: HELP with power supply for spyrograph

You're putting the DMM set to current mode in parallel to the motor?
You're shorting out the circuit!
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