12vdc or not?

[stdly]

I bought a 12vdc 1a wall plug in power supply today to use in my encloser to power a parellel port breakout board and a fan.
After getting it home I am reading 16vdc on the output.
Is this because of no load?
will I have to buy a voltage regulator to control this?

Steve

[Al_The_Man]

The wall wart is traditionally high output, they rely on a load to bring it down, unregulated supply, try it with your load it should drop somewhat.
Al.

[stdly]

Originally Posted by Al_The_Man The wall wart is traditionally high output, they rely on a load to bring it down, unregulated supply, try it with your load it should drop somewhat. Al.

Thanks Al,

The load thing is what I thought I read on one of your other posts.
If I have to can I regulate this supply?
Do you know where I can buy a small multi 12VDC board supply?

Steve

[Al_The_Man]

Can't you use one of the drive connectors on the PC? the yellow is 12v with respect to black. It can't be much current you are looking at.
Al.

[stdly]

Originally Posted by Al_The_Man Can't you use one of the drive connectors on the PC? the yellow is 12v with respect to black. It can't be much current you are looking at. Al.

Al,
I did realize the computer had 3.3, 5 and 12vdc.
I thought I heard something about interference from these supplies?
I have a couple spare computer power supplies lying around but as I said I thought this would be a problem.
My computer and my enclosure are separate and I was trying to keep it clean looking.
I could build a small supply using the info I found here to build my motor psu just in a smaller format. I just thought it might be almost cheaper and easier to buy a small supply somewhere
Steve

[ViperTX]

mpja.com is usually a good source.

[NC Cams]

Hmmm

16vdc wall plug (already have) plus some perf board plus LM2940T-12 in To-220 package plus a few capacitors and maybe a heat sink should give you about 1 amp and 12 volts with relative ease.

Check out the application note at National Semiconductor. Parts can be sourced from DigiKey.

[stdly]

I hooked up my 3 12vdc fans for the geckos to this supply and it went down to 13.2vdc is that ok to run on the 12vdc appliance?
Steve

[Al_The_Man]

Fans are pretty tolerant devices, I don't see 13v being a problem.
Al.