Re: regulated vs unregulated 12v supply

["Dave McLaughlin" <dave@xxxxxxx>]

Hi Umar,

Most if not all of these cameras regulate internally to +5V with 7805 type
regulators and should be able handle up to 24V but they don't usually
specify that. But to be safe I would restrict the input to a max of 13V.

Why not check the output of the power supply off load first and if possible
load it with 250mA and see what the output is. If they are 300mA types,
then
the chances are that they will be very close to 12V.

Regards
Dave...
/STANDARD DISCLAIMER
If you duff the cameras, it ain't my fault guv, honest
STANDARD DISCLAIMER/

----- Original Message -----
From: <umar@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Friday, December 06, 2002 3:22 PM
Subject: [ukha_d] regulated vs unregulated 12v supply


>
> Slightly OT, but can anyone help me here.
>
> I have installed some 12v 250ma CCTV cameras - they didnt come with
power
supply !!!!!!!!!
>
> I have found some 12v 300mA unregulated power supplies, and wonder if
they
will be OK ie not damage the cameras? Reason I ask is they are 1/4 of the
price of regulated supplies, and as I need 8 of them, difference is quite
substantial.
>
> Any ideas anyone.
>
> Thanks
>
> Umar


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