3.5a power supply

[Joe Shmoe]

Hi. I've got a 24v 3.5a power supply (the kind you use for video games or kids pianos etc) but the cables aren't long enough for what I want. I know I could use an extension lead and just plug the power supply in that, but wondered if you can get special cables that connect to the power pack and extend the length of the cable?

Anyone know if and where you can get these?


Cheers.

 

[Joe Shmoe]

Like this I think, but need a 5m one.

Are they safe?

http://cpc.farnell.com/1/1/34787-lead-d ... -elec.html

 

[MMUK]

Perfectly safe but not waterproof (I don't know if that is a consideration or not?). after all said and done, we're talking ELV of only 24v.

 

[SteveF]

i normally just hack the cable and put an extra bit in the middle

solder or wago's

u may get a voltage drop ...so take this into consideration

Steve

 

[monkeybiter]

u may get a voltage drop ...so take this into consideration

I think you may find that the most significant drawback to extend on the outlet side.

 

[MMUK]

u may get a voltage drop ...so take this into consideration

Voltage drop over 5m at 24vDC is going to be negligible

 

[monkeybiter]

u may get a voltage drop ...so take this into consideration

Voltage drop over 5m at 24vDC is going to be negligible

Hopefully, but it's not just the extra cable but the connector which is likely to degrade with use. I'd rather extend the mains supply as that is much greater than required by the psu and any reduction [also negligable] will not affect the final output at all.

All academic really as either way will probably be sufficient.

 

[SteveF]

just wago an extra piece in

so much cheaper

Steve

 

[MMUK]

just wago an extra piece in

so much cheaper

Steve

Or do a proper job by soldering and heat shrinking instead of a Wago botch :wink:

 

[Joe Shmoe]

Cheers guys,

I've just read that I need an AC 24v 3.5a power supply, and not to use DC as it will damage the product.

What's the difference between them? Do general plug in power supply units have the option of switching between them? I seem to recall they do, but haven't had one in years so cannot remember.

 

[Jonzjob]

What are you using it for pray tell?

 

[SteveF]

sounds like a cctv project ?

 

[MMUK]

Cheers guys,

I've just read that I need an AC 24v 3.5a power supply, and not to use DC as it will damage the product.

What's the difference between them? Do general plug in power supply units have the option of switching between them? I seem to recall they do, but haven't had one in years so cannot remember.

The difference is that DC current flows in only one direction, AC current alternates direction 50 times per second on the UK grid.

If you can let us know what you need this PSU for, we can better advise

 

[Joe Shmoe]

Cheers guys,

It's for a PTZ cctv cam. I've ordered it but I don't think it comes with the power supply. iTs supposed to be Poe+ but my NVR only delivers poe, so I think I will need a power supply rather than buying a poe plus injector as that will probably turn out more expensive?

Man, I am rubbish with technology lol. I'm dreading setting up the thing lol.

 

[SteveF]

i guessed right

let me see if i have one at work on tuesday

no promises as have 4 large boxes of power supplies to go thru

will let u know as soon as checked

Steve

 

[MMUK]

You've gone for the professional camera then rather than the domestic which run on 12vDC.

Yes, all of the PTZ professional cameras run on 24vAC. Most of them draw around 500mA.

A PSU like this should be plenty: http://cpc.farnell.com/stontronics/t446 ... dp/PW02798

 

[Joe Shmoe]

Cor that's expensive as I figured I could use one of the £8 units from Maplin etc. I think I'd rather spend another tenner and get a PoE plus injector, and save the hassle of wiring up etc. I've got several PoE powered domes already, which the NVR powers. Annoying that it doesn't do the new Ptz. Grr.

 

[SteveF]

save your cash

let me check in office on tuesday

if u can wait

Steve

 

[Jonzjob]

For us dimmies http://en.wikipedia.org/wiki/Pan%E2%80% ... oom_camera

And POE is power over ethernet and poe+ is power over internet plus :mrgreen: :mrgreen:

 

[Joe Shmoe]

Will do Steve, thanks very much! Very kind.