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  #1  
Old 03-15-2011, 09:51 AM
Rain man Rain man is offline
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Default power supply

I am trying to make a 12 volt power supply am I would like to know how many amps does a 1/24th scale motor draw? This could be an average motor. Thanks Mike
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Old 03-15-2011, 12:20 PM
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A 16D motor has a 0.7 ohm armature, at 12 volts it could pull over 10 amps when it first starts up. Free running at 12 volts they pull about 1.2 amps. I have never measured what they will pull when a car is going around the track, but 5 amps per lane should be enough. A "home set" 16D motor would use less power.
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Old 03-15-2011, 12:47 PM
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Mike -

There are MANY...motors used in 1/24 scale cars.
You need to clearify the motors you are talking about.

Many retail shops still use car batteries (with charger), and you know, they can go from 45amps to well over 250amps to power their tracks.

What motor(s) will you be running ?

Mike
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Old 03-16-2011, 04:35 AM
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Default Power supply

Thanks For the info. What I am trying to do is install a small power supply into my slot car box to break in motor's and to power my Hudy tire machine. I already have a 110 volt system with two 4mm plugs to power my iron and light I left a feed for some type of transformer I wired a DC meter from 0 to 20 amps a switch and a wired reastate to adjuct the amps. Thanks Mike
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Old 03-21-2011, 07:35 AM
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A Hudy is powered by an R/C motor, free running they pull 1 amp, how much they will pull when you are truing a tire depends on how much pressure you apply. I power my Hudy with a Pyramid PS-26KX, which has volt and amp meters. I true at 10 volts and keep the amps between 2 and 3. At that power level it would be best if your power supply had fan cooling.
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Old 03-21-2011, 12:45 PM
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I use an old telephone transformer, .75 amp's for that, works great. Just put two alligator clamps in place of the plug...
You can find them from .25 to 2 amps cheap, don't toss that old transformer from used up DC stuff. Those little black boxes can come in handy.

Mike
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Old 03-30-2011, 08:58 AM
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Default DC regulated power supply

I use a DC regulated Power supply that has meters for volts and amps. There a three settings for voltage ranges, which works great because you can dial in specific voltage in each range, and see what the cars draw as far as amperage. It's also good if you have first time racers, you can increase voltage as they get used to the track.
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Old 03-30-2011, 09:30 AM
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What about a laptop power supply? there are some cheap ones on ebay that can switch between 5 or 6 voltage levels and put out about 5 amps. Plus they are nice and compact so they won't take up too much room in your pit box.
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Old 03-30-2011, 12:07 PM
Michael Rigsby Michael Rigsby is offline
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It's all going to depend on what kind of tires you are truing also. Maybe the smaller 1/32 scale stuff would be an amp to two amps. I have a 12V-8Amp Wrightway portable power supply that I use on my 1/24th scale cars because truing those tires, the amp draw is about 3 amps. When I cut down donuts, it's closer to 5 amps, so it's going to depend on the tire and/or the motor. If you are making one, give yourself at least 50% headroom on the amperage, just to be safe, and when you are done, make sure to check for any AC ripple.

Michael Rigsby
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Old 03-31-2011, 03:55 AM
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Thank you all for the great info it really helped. Mike
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Old 04-12-2011, 03:16 PM
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how about a PC power supply ????

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  #12  
Old 04-12-2011, 11:57 PM
Al's slotracing Al's slotracing is offline
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Quote:
Originally Posted by RAC420 View Post
how about a PC power supply ????

Some work straight away, some can be made to work, some cannot.
A common problem is they turn off on low load. This can be overcome by putting a resistor permanently across the output. Some need quite a few watts of load, so getting rid of the extra heat is an issue.
At worst they just won't work on motors, possibly because the protection circuits don't like the motor's commutator switching spikes.

Make sure you get one in a proper case with all the high voltages enclosed.
Worth a try if you've got one for free (like out of a scrap PC), may not be a good idea if you are buying one at full price.

Last edited by Al's slotracing; 04-13-2011 at 12:00 AM.
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