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Re: 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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