Old 10-04-2011, 04:08 AM #81
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Default Re: PC PSU into a Lab PSU

Measuring current on a voltage regulator without load is just shorting it. Shorting PSUs tends to switch them off. (assuming the regulator isn't shutting down first)


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Old 10-04-2011, 04:14 AM #82
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Default Re: PC PSU into a Lab PSU

Ok I think you've noticed I'm no electronics buff heh but I have a voltage regulater in series with a current regulator the cc coming after the cv but I still get the same thing

EDIT : nevermind I found out I must of wired it wring I will re solder the circuit Tom. I'm tired
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Old 10-06-2011, 02:36 AM #83
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Default Re: PC PSU into a Lab PSU

ok finally got my prototype, you could call it of my circuit working

now for my final parts i will be using a lm885 for 5 amps

how do i calculate need W rating of my pots? i blew one today but it was only 3/4 W

but my 3W rheostat also gets hot
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Old 10-08-2011, 03:18 AM #84
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Default Re: PC PSU into a Lab PSU

How to Calculate Potentiometer Needs | eHow.com
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Old 10-08-2011, 03:30 AM #85
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Default Re: PC PSU into a Lab PSU

thanks ill see if i can figure it out
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Old 10-08-2011, 03:32 AM #86
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Default Re: PC PSU into a Lab PSU

Quote:
Originally Posted by bennett326 View Post
thanks ill see if i can figure it out
Lol
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Old 10-08-2011, 03:36 AM #87
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Default Re: PC PSU into a Lab PSU

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Lol
youre talking to a kid thats taking algebra for the second time
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Old 10-08-2011, 04:16 AM #88
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Default Re: PC PSU into a Lab PSU

When used as a rheostat, I'd question their correction factor. If anything, it should be more because the heat is created in a small portion of the device.

For example, what exactly do the manufacturers mean when saying a pot can dissipate 5W? If it were 5W across the whole resistive pad, it would surely be less if the heat were generated using only 10% of the pad.
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Old 10-08-2011, 04:18 AM #89
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Default Re: PC PSU into a Lab PSU

can you heatsink pots
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Old 10-08-2011, 07:39 AM #90
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Default Re: PC PSU into a Lab PSU

You can heatsink anything, but im not too sure if it will help in this case
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Old 10-08-2011, 10:55 AM #91
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Default Re: PC PSU into a Lab PSU

Lately i found an old PSU in my basement. I soldered a little here and a little there and this is what i got(it isn't finished yet...need some more parts to finish up the built):
The PSU:

The 25W 10 ohm resistor:



OFF:


ON:


The highpower LED from Nichia if i remember right



The wires which are left(2 x normal lines with 5V|GND|GND|12V and one with 3.3V|3.3V and finaly a separate -12V wire):



Any thoughts or suggestions are welcome
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Old 10-08-2011, 07:51 PM #92
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Default Re: PC PSU into a Lab PSU

ordering stuff now few pots 338's and resistors tut should be up next week if all goes well
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Old 10-11-2011, 07:04 PM #93
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Default Re: PC PSU into a Lab PSU

update order has been shipped should be here monday i will be using a 2 pot adjustment for each voltage and current(in total 4 pots) and max output will be 5A around 11.5 V
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Old 12-13-2011, 07:48 AM #94
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Default Re: PC PSU into a Lab PSU

PSU is finished! Will get some pics and maybe a vid of it charging my boostcap up shortly :

Edit: I ran this thing for 1 hour straight with 0 heat issues The plate resistor stays at around the same temperature as its heatsink and at the end if the run it was ever so slightly warm.

I will post a tutorial soon enough and some pics in 24 hours (hopefully)

Btw benneh, did you get yours working?
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Old 12-13-2011, 09:45 PM #95
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Default Re: PC PSU into a Lab PSU

Quote:
Originally Posted by LaZeRz View Post
PSU is finished! Will get some pics and maybe a vid of it charging my boostcap up shortly :

Edit: I ran this thing for 1 hour straight with 0 heat issues The plate resistor stays at around the same temperature as its heatsink and at the end if the run it was ever so slightly warm.

I will post a tutorial soon enough and some pics in 24 hours (hopefully)

Btw benneh, did you get yours working?
yeah mines working i gave mine the option of CC but havent used it once

i havent ran it for an hour as there is no need but see if you can do that limiting it to say 3v

ill post pics later ....
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Old 12-17-2011, 04:07 AM #96
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Default Re: PC PSU into a Lab PSU

Da PSU...







I got a hacksaw and cut a chunk out of a CPU cooler to make it fit in my box
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