Re: Re: Re: White LED Lighting... was RE: Re: ADSL vs Cable

[Steve B <steve@xxxxxxx>]

These were only 6" away. I am only telling it the it was. My advice is
use 
extra diodes.

I agree it should not be necessary - i found otherwise my colleague also
knew otherwise.


At 10:22 26/04/2002 +1000, you wrote:
>Hi Steve
>            
I have used these chips before and if driving a relay board 
> for instance which is is in close wiring proximity i wouldnt bother
with 
> diodes , dont recall having any problems ,as Keith says just make sure
> the relays are supplied by the same source as the chip. If i was 
> connecting to remote relays or solenoids i would put diodes across the
> relay or solenoid.
>Frank Mc
>----- Original Message -----
>From: <mailto:steve@xxxxxxx>Steve B
>To: <mailto:ukha_d@xxxxxxx>ukha_d@xxxxxxx
>Sent: Friday, April 26, 2002 6:55 AM
>Subject: Re: Re: Re: White LED Lighting... was RE: [ukha_d] Re: ADSL vs
Cable
>
>After two of these chips  frying themselves after a few days use.
The
>second one caused additional damage.
>
>I emailed an old colleague of mine who is an electronic design engineer
and
>immediately from experience suggested i added diodes as they had found
the
>internal ones inadequate in product designs.
>
>I added diodes and 12 months later the kit is functioning fine.
>
>For the sake of a few pence.......... Dont take the risk.
>
>
>
>At 21:13 25/04/2002 +0100, you wrote:
> >Thats not a very helpfull reply Steve, why?
> >
> >Alancc
> >----- Original Message -----
> >From: Steve B <steve@xxxxxxx>
> >To: <ukha_d@xxxxxxx>
> >Sent: Thursday, April 25, 2002 8:46 PM
> >Subject: Re: Re: Re: White LED Lighting... was RE: [ukha_d] Re:
ADSL vs
> >Cable
> >
> >
> > > Do not rely on the internal diodes
> > >
> > > At 18:16 25/04/2002 +0100, you wrote:
> > > >Homevision has the diodes already built in the ULN2803A
chip, have a 
> look
> >at
> > > >page 106 in the HV bible.
> > > >
> > > >Alancc
> > > >
> > >
> >
> >
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>Steve.
>
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