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Thread

re: LED polarity

2008-06-09 by THX1742

Finally started making my P3 (hooray), all's going good so far and although I'm a relative 
novice to electronics construction most of the solder joints are looking clean. However, I was 
wondering about the orientation of the LED's in the function switch board. I know that the 
shorter leg of the LED is negative and notice that on the board each LED position has one 
hole "square" (by this I mean that where the metal plate shows through the green of the 
board it's etched out a square) and one hole "circle", question is which one's positive, which 
one negative? Also is this a standard way of marking the polarity on boards? Many thanks in 
advance, and apologies for lack of correct terminology,

In fairness I imagine this may well be just the start of threads by me about stuff like this as 
construction goes on!

P.

Re: LED polarity

2008-06-09 by boops.secretvibes

hi,i am buiding a p3 too!!

read this:in the section diy P3 web site version 4

The process I use for fitting the LEDs to the correct height is the
same as for the Function switch board. I put the LEDs loosely into
their holes, making sure to observe the correct orientation, then fit
the board to the panel, and feed the LEDs into the panel holes so they
are all at an even height.
N.B.These Tri-colour LEDs have 2 anodes and a common cathode. The
anode for the RED LED has a right-angle at the top of the component
leg. The GREEN LED has a 45 degree angle at the top of the leg. The
RED anode should go toward to top of the board, and the GREEN anode in
the hole with the square around it on the component overlay.
Here's the board with the LEDs just sitting in place - not soldered !

good luck Boops

Re: LED polarity

2008-06-10 by THX1742

Thanks for that,

for some reason that I can't quite fathom I can't actually find that bit of text on the site, 
on the http://www.sequentix.com/build/cnst-switches.htm Colin does speak about the 
LED's but not as you've quoted. Anyway I was being unclear as I'm actually still on the 
regular LED with just the 2 legs, square pad -, circle pad + ?

Thanks again, 

Peter.

--- In analogue-sequencer@yahoogroups.com, "boops.secretvibes" 
<boops.secretvibes@...> wrote:

Show quoted textHide quoted text

>
> hi,i am buiding a p3 too!!
> 
> read this:in the section diy P3 web site version 4
> 
> The process I use for fitting the LEDs to the correct height is the
> same as for the Function switch board. I put the LEDs loosely into
> their holes, making sure to observe the correct orientation, then fit
> the board to the panel, and feed the LEDs into the panel holes so they
> are all at an even height.
> N.B.These Tri-colour LEDs have 2 anodes and a common cathode. The
> anode for the RED LED has a right-angle at the top of the component
> leg. The GREEN LED has a 45 degree angle at the top of the leg. The
> RED anode should go toward to top of the board, and the GREEN anode in
> the hole with the square around it on the component overlay.
> Here's the board with the LEDs just sitting in place - not soldered !
> 
> good luck Boops
>

RE: [analogue-sequencer] Re: LED polarity

2008-06-10 by Colin Fraser

The square pads are the anode, the circles are the cathode.

Best regards,
Colin Fraser
Sequentix Music Systems Ltd
http://www.sequentix.com

Show quoted textHide quoted text

> -----Original Message-----
> From: analogue-sequencer@yahoogroups.com 
> [mailto:analogue-sequencer@yahoogroups.com] On Behalf Of THX1742
> Sent: 10 June 2008 16:51
> To: analogue-sequencer@yahoogroups.com
> Subject: [analogue-sequencer] Re: LED polarity
> 
> Thanks for that,
> 
> for some reason that I can't quite fathom I can't actually 
> find that bit of text on the site, 
> on the http://www.sequentix.com/build/cnst-switches.htm Colin 
> does speak about the 
> LED's but not as you've quoted. Anyway I was being unclear as 
> I'm actually still on the 
> regular LED with just the 2 legs, square pad -, circle pad + ?
> 
> Thanks again, 
> 
> Peter.
> 
> --- In analogue-sequencer@yahoogroups.com, "boops.secretvibes" 
> <boops.secretvibes@...> wrote:
> >
> > hi,i am buiding a p3 too!!
> > 
> > read this:in the section diy P3 web site version 4
> > 
> > The process I use for fitting the LEDs to the correct height is the
> > same as for the Function switch board. I put the LEDs loosely into
> > their holes, making sure to observe the correct 
> orientation, then fit
> > the board to the panel, and feed the LEDs into the panel 
> holes so they
> > are all at an even height.
> > N.B.These Tri-colour LEDs have 2 anodes and a common cathode. The
> > anode for the RED LED has a right-angle at the top of the component
> > leg. The GREEN LED has a 45 degree angle at the top of the leg. The
> > RED anode should go toward to top of the board, and the 
> GREEN anode in
> > the hole with the square around it on the component overlay.
> > Here's the board with the LEDs just sitting in place - not 
> soldered !
> > 
> > good luck Boops
> >
> 
> 
> 
> 
> ------------------------------------
> 
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> 
> 
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RE: [analogue-sequencer] Re: LED polarity

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