RE: HomeVision Supply Voltage...

["Keith Doxey" <ukha@xxxxxxx>]

The voltage regulator can handle an input of upto 35V. HOWEVER.... the more
voltage the regulator has to drop, the hotter it will run. The heatsink is
not designed to dissipate that amount of heat.

A simple way round it would be to put 5 x 1N4001 in series with the input.
Each diode will drop about 0.6V giving a total drop of about 3Volts.

That will safely drop your 12V supply to 9V without generating any heat.

Dont forget to fit fuses to the output leads of your PSU. It will be
capable
of very high currents and you dont want anything to burn up. The PSU may
well shut down in the event of a fault but you cant guarantee that. Also by
using seperate fuses for multiple outputs you wont lose the whole system
because on remote device was blowing the fuse/shutting down the PSU.

HTH

Keith

> -----Original Message-----
> From: Phil Harris [mailto:phillip.harris1@xxxxxxx]
> Sent: 18 October 2001 09:17
> To: ukha_d@xxxxxxx
> Subject: [ukha_d] HomeVision Supply Voltage...
>
>
>
> I know that HV is shipped with a 9v PSU but does anyone know whether
the
> regulation on it is up to the job of being driven from 12v?
>
> The reason I ask is I'm thinking of recasing it in a box that
> will enable me
> to include an expansion card or two (as Mark, Keith and a couple of
others
> have) and I have some nice and fairly meaty external drive PSUs which
put
> out 12v and 5v and don't need a load on the 5v line to supply a steady
12v
> load. (PC PSUs generally need to have load on both the 12v and 5v
lines at
> least before they work correctly.) This would mean that I could
> build in the
> PSU too which would get rid of a wall wart or two!
>
> Phil
>
>
>
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