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Re: Well.... we weren't arrested....
Another link that might be useful for led theory.............
http://misty.com/people/don/ledd.html
Frank
good nite
----- Original Message -----
From: "Frank Mc Alinden" <armagh@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Tuesday, September 17, 2002 10:58 PM
Subject: Re: [ukha_d] Well.... we weren't arrested....
> Mark
> Play it safe, order some say 330 + 470 ohm as well and use the
470
> first ,if you have a multimeter check the current draw ,ie connect
meter
in
> series making sure its set for milli amps .....most leds are around
> 20mA...... Dont want you to blow them up first go .................
>
> Frank
>
> ----- Original Message -----
> From: "Mark Harrison" <Mark.Harrison@xxxxxxx>
> To: <ukha_d@xxxxxxx>
> Sent: Tuesday, September 17, 2002 10:52 PM
> Subject: RE: [ukha_d] Well.... we weren't arrested....
>
>
> > Frank,
> >
> > Thanks - that's a good idea.
> >
> > I've only ordered a few LEDs, of different types, to see which I
prefer.
A
> 12v supply, and a 180ohm resistor from Craplins it is :-)
> >
> > M.
> >
> > -----Original Message-----
> > From: Frank Mc Alinden [mailto:armagh@xxxxxxx]
> > Sent: 17 September 2002 13:49
> > To: ukha_d@xxxxxxx
> > Subject: Re: [ukha_d] Well.... we weren't arrested....
> >
> >
> > Mark
> > The Christmas tree light thingy correct , one out all
out , Im
> > doing some garden lites (eventually) and im going to use 12v dc ,
i
will
> > put 3 in series and use a resistor around 180 ohm ...... Maybe
Ian can
> put
> > something on his site???????
> >
> > Frank
> >
> > ----- Original Message -----
> > From: "Mark Harrison" <Mark.Harrison@xxxxxxx>
> > To: <ukha_d@xxxxxxx>
> > Sent: Tuesday, September 17, 2002 10:28 PM
> > Subject: RE: [ukha_d] Well.... we weren't arrested....
> >
> >
> > > Frank,
> > >
> > > I believe you :-) I was asking to increase my own
understanding...
> > >l
> > > OK - next question, probably for Keiran... what value of
resistor and
> > power supply should I be using with the ones you sold me
yesterday?
> > >
> > > M.
> > >
> > > -----Original Message-----
> > > From: Frank Mc Alinden [mailto:armagh@xxxxxxx]
> > > Sent: 17 September 2002 13:26
> > > To: ukha_d@xxxxxxx
> > > Subject: Re: [ukha_d] Well.... we weren't arrested....
> > >
> > >
> > > I cant remember the exact theory but one led tends to rob
all the
> current
> > > from memory, i think it might have something to do with the
voltage
> > > characterics of each led being slightly different ,but
believe me Mark
> > they
> > > need a seperate resistor .....
> > >
> > > Frank
> > > ----- Original Message -----
> > > From: "Mark Harrison"
<Mark.Harrison@xxxxxxx>
> > > To: <ukha_d@xxxxxxx>
> > > Sent: Tuesday, September 17, 2002 10:21 PM
> > > Subject: RE: [ukha_d] Well.... we weren't arrested....
> > >
> > >
> > > > Frank,
> > > >
> > > > Why?
> > > >
> > > > Given that the resistor only serves to dump current,
I'd assume that
I
> > > could have several LEDs in parallel with each other, then a
resistor
> > between
> > > that array and the -ve rail.
> > > >
> > > > Why won't this work?
> > > >
> > > > Mark
> > > >
> > > > -----Original Message-----
> > > > From: Frank Mc Alinden [mailto:armagh@xxxxxxx]
> > > > Sent: 17 September 2002 13:18
> > > > To: ukha_d@xxxxxxx
> > > > Subject: Re: [ukha_d] Well.... we weren't arrested....
> > > >
> > > >
> > > > Hi Mark
> > > > If your wiring in parallel you must use a
resistor for
> each
> > > led
> > > > ... remember the led link here it is
> > > > again............http://www.poptronics.com/interactive/index.html
> > > >
> > > > Frank Mc
> > > > ----- Original Message -----
> > > > From: "Mark Harrison"
<Mark.Harrison@xxxxxxx>
> > > > To: <ukha_d@xxxxxxx>
> > > > Sent: Tuesday, September 17, 2002 10:14 PM
> > > > Subject: RE: [ukha_d] Well.... we weren't arrested....
> > > >
> > > >
> > > > > Funny you should mention that :-)
> > > > >
> > > > > I assume, BTW, that LEDs can be wired in parallel,
so you
> effectively
> > > > have:
> > > > >
> > > > > -----------------------------
> > > > >
> > > > > +ve rail
> > > > >
> > > > > LED LED LED LED
> > > > >
> > > > > Resistor to dump the current
> > > > >
> > > > > -ve rail
> > > > >
> > > > > ------------------------------
> > > > >
> > > > >
> > > > > Does this sound right?
> > > > >
> > > > > M.
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > -----Original Message-----
> > > > > From: Daniel James [mailto:daniel@xxxxxxx]
> > > > > Sent: 17 September 2002 13:11
> > > > > To: ukha_d@xxxxxxx
> > > > > Subject: RE: [ukha_d] Well.... we weren't
arrested....
> > > > >
> > > > >
> > > > > Does this mean Mr Harrison is going to pick up a
soldering iron...
> > > > >
> > > > > .....only i'd like some notice first.... :-)
> > > > >
> > > > > -----Original Message-----
> > > > > From: Broadfoot, Kieran J [mailto:Kieran.Broadfoot@xxxxxxx]
> > > > > Sent: 17 September 2002 13:07
> > > > > To: 'ukha_d@xxxxxxx'
> > > > > Subject: RE: [ukha_d] Well.... we weren't
arrested....
> > > > >
> > > > >
> > > > >
> > > > > well it sure wasnt me ;-)
> > > > >
> > > > > next time you'll see me ill be standing on a
street corner with a
> long
> > > > rain
> > > > > coat on saying: "here mate, wanna buy some
leds" ;-)
> > > > >
> > > > > kieran
> > > > >
> > > > > -----Original Message-----
> > > > > From: Daniel James [mailto:daniel@xxxxxxx]
> > > > > Sent: Tuesday, September 17, 2002 1:05 PM
> > > > > To: ukha_d@xxxxxxx
> > > > > Subject: RE: [ukha_d] Well.... we weren't
arrested....
> > > > >
> > > > >
> > > > > Were they your finest Caribbean gold ones then?
:-)
> > > > >
> > > > > BTW who was the smartly dressed one :-P
> > > > >
> > > > > D
> > > > >
> > > > >
> > > > > http://www.automatedhome.co.uk
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