Joel, Do you have the part #'s as I note there are a couple different in each color? I note these are round versions and I wonder if these are difficult to line up in the display due to any manufacturing differences. Do you have a Picture of your finished product?
73, Bill K9YEQ K2 #35; KX1 #35; K3 #1744; mini mods -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Joel Curneal Sent: Thursday, March 05, 2009 4:22 PM To: [email protected] Subject: Re: [Elecraft] [MM] The W1 LED Experiment Has anyone else tried high intensity leds in their W1? I replaced the leds in my W1 with high intensity red, yellow (amber), and green leds from Sparkfun Electronics. A pic can drive them to a much higher light output without any other changes to the W1 circuit board. The light output from the different colors is almost the same on a stock W1 board. Joel, N1JEO ----- Original Message ----- > I apologize for taking so long to conduct the LED experiment and get > back with everyone interested. I had some lead times on parts I ordered > not to mention getting some time to run everything through. I must > mention first that I had to do numerous swaps of different LEDs and > resistor packs and this simply would not have been possible to do in a > timely manner without using my new Hakko 808 desoldering tool. I'm sure > I would have damaged the W1 PCB trying to do it manually over and over > again. That thing was worth every penny I paid for it. > > The slight differences in forward voltages of the various LEDs played no > appreciable role in current consumption. So I'll just list the 3 > resistor pack values I used. I did look up the LM78L05 regulator spec > sheet and found out it will produce up to 100ma output current. The > current W1 design operates at far less than that. The LEDs are probably > pulse width modulated (or simply polled) by the PIC also so the current > draw per LED seems to be about half of what you would calculate with a > voltage of around 3v and the resistor pack value. > > Here is some of the data: > > W1 idle current: 13.8 ma > > Current draw regardless of LED type per resistor pack value (18 out of > 20 LEDs lit): > > 2.0k - 27.5ma > 1.0k - 39.3ma > 470 - 63.0ma > > I wanted to try an 810 or 680 ohm resistor pack, but could not get them > in time from Digi-Key. As I personally wanted to stay within the 50ma > range, the 1.0k value works for me. Like I said, to my eyes in a well > lit environment, this value seemed to work fine with the Lumex LEDs > although the Avago red LEDs were a hair brighter. > > Part numbers: > My configuration: > > All Digi-Key part #'s > > Lumex Red 2x5mm LED - 67-1047-ND > Lumex Yellow 2x5mm LED - 67-1050-ND > Lumex Green 2x5mm LED - 67-1046-ND > > > > 73, > Dave W8FGU > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
