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Old 04-03-2011, 06:56 AM #1
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Default Driver help?

So I build an LM1117 driver... pretty simple set up. I grabbed the 3.01Ohm resistor from the Rkcstr driver (it broke, unfortunately, so I salvaged that 2W resistor), and stuck it in my new driver.

But... why the hell won't it work?! I am getting currents of .5A out of it with a 3.01Ohm resistor. That's not right! And weirdly enough, it starts out at like 400mA then climbs up to around .51A.

Anyone have any ideas?

Further, it starts out at like 1.2A and quickly drops down to around .45A, but then it starts rising again.



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Old 04-03-2011, 07:19 AM #2
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Default Re: Driver help?

What is Your power source?
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Old 04-03-2011, 07:21 AM #3
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Default Re: Driver help?

I've tried both one 14500 and two 14500s.
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Old 04-03-2011, 07:34 AM #4
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Default Re: Driver help?

With a 3.01 resistor You should get ~0.415a
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Old 04-03-2011, 07:35 AM #5
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Default Re: Driver help?

Exactly. That's why I am wondering why I am getting so much extra current! The resistor isn't faulty, either. I checked it.
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Old 04-03-2011, 07:46 AM #6
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Default Re: Driver help?

Did You ohm out the resistor? Do you have the Caps on the input and output? they are required om an LM1117.
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Old 04-03-2011, 08:00 AM #7
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Default Re: Driver help?

Crap - I don't have caps on the INPUT. Just on the output.
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Old 04-03-2011, 08:03 AM #8
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Default Re: Driver help?

That should take care of the problem.
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