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Jan 08, 2011, 01:43 PM
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Opinion on power supply please

Hi all,
I recently bought a switching power supply with adjustable voltage.
I set the voltage to 12.5 but checking by digital volt, the voltage keeps jump and down between 11.8 to 12.5 without any load.

Will that damage my charger?
Last edited by whiskey29; Jan 08, 2011 at 08:25 PM.
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Jan 08, 2011, 03:12 PM
Registered User
Your p ower supply is not under load, therefore you are seeing the voltage switch. No it it will damage
your charger
Jan 08, 2011, 08:29 PM
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Thread OP
hnaks for reply.
I have to make a correction my self the voltage is jumping between 10.5-12.5 volt. Its quite big isnt it ?

But you remind me of my own DIY PSU from computer PSU.
I remember that I put two 5watt resistor on the 5v rail.

But after using it with charger, the voltage stabilize.
Altough it went low enough when I havent start the charging, and turns of the charger (the lowest voltage required is 10v)

SO If I put a load that should bring it to a stable range right.
Now what should I put on the output of the charger,
1. A 12v fan. (there are two fans already inside)
2. a 5 watt resistor at a certain value.

Jan 08, 2011, 08:58 PM
**** 37130 ****
RobC(UK)'s Avatar
Wire up some 12V auto bulbs and load the power supply up to 50 to 75% of its rated power. If the voltage is still not stable then don't use it for charging.
Jan 08, 2011, 09:02 PM
You can call me FANBOY!
Like warren said if its a switching power supply similar to PC PSU then it probably wont be stable until there is a load on it. I would definitely check it under load like Rob said and make sure it stabilizes under load.
Jan 08, 2011, 11:35 PM
Registered User
If this is a PC power supply go to this site [URL=""] this will clear it up for you.
Good Luck
Last edited by warrensawdust; Jan 08, 2011 at 11:53 PM. Reason: more information
Jan 09, 2011, 02:19 AM
Registered User
Thread OP
No its not pc power supplies.
I will give it a shot with the load.

Thanks guys

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