LED PPO2 Display parts query

Sandy · 16th August 2008, 16:49

I've had a look through the numerous threads regarding O2 displays and come across a PDF schematic by Dan Fountain entitled "PO2 HUD" Rev.3.0. It looks tidy but I cannot identify what the LED array part is. It has a signin, all the led's, Refadj, Refout etc but I'm just not sure what it is. All other parts are labeled clearly. Anyone built this with success?

DanFountain · 18th August 2008, 15:19

Sandy,

Sorry about the delay in answering. The LED bar graph driver is an LM3914.

-Dan

**jmurba** · 9th September 2008, 18:23

Quote: (Originally Posted by DanFountain)

Sandy,

Sorry about the delay in answering. The LED bar graph driver is an LM3914.

-Dan

wow a lm3914 good idea for a cheap hud, I remember that ten year ago a guy had even don a rebreather controler using this old chip.

where can I fin details on you circuit (just for fun)

regards

jean mi

koputai · 10th September 2008, 12:51

Quote: (Originally Posted by jmurba)

wow a lm3914 good idea for a cheap hud, I remember that ten year ago a guy had even don a rebreather controler using this old chip.

I think it was Ake Larson wasn't it? Maybe search the old NWDesigns archive.

Edit: Try this,
lm3914 site:nwdesigns.com - Google Search

Cheers,
Jason.

DanFountain · 10th September 2008, 15:43

Quote: (Originally Posted by jmurba)

wow a lm3914 good idea for a cheap hud, I remember that ten year ago a guy had even don a rebreather controler using this old chip.

where can I fin details on you circuit (just for fun)

regards

jean mi

Jean Mi,

There was a thread on here a while back - I think bnscherm was building one -

http://www.rebreatherworld.com/home-...2-meter-5.html

Looking at the .pdf I posted I see that I didn't identify the driver - it is in fact the LM3914.

-Dan

**jmurba** · 10th September 2008, 22:11

Quote: (Originally Posted by koputai)

I think it was Ake Larson wasn't it? Maybe search the old NWDesigns archive.

Edit: Try this,
lm3914 site:nwdesigns.com - Google Search

Cheers,
Jason.

exactly, thanks good old time of rock and roll .
3914, 555 excellent...

16th August 2008, 16:49	#1 (permalink)
Sandy New Member Current Rebreather/s: Other CCR Home Build Other Rebreather/s: Other CCR Home Build Join Date: Aug 2006 Location: London Posts: 30	LED PPO2 Display parts query I've had a look through the numerous threads regarding O2 displays and come across a PDF schematic by Dan Fountain entitled "PO2 HUD" Rev.3.0. It looks tidy but I cannot identify what the LED array part is. It has a signin, all the led's, Refadj, Refout etc but I'm just not sure what it is. All other parts are labeled clearly. Anyone built this with success?
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18th August 2008, 15:19	#2 (permalink)
DanFountain This is my custom title! Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: Dec 2005 Location: Lake Superior Posts: 113	Re: LED PPO2 Display parts query Sandy, Sorry about the delay in answering. The LED bar graph driver is an LM3914. -Dan __________________ Try not. Do - or do not. There is no try. -Yoda
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9th September 2008, 18:23	#3 (permalink)
jmurba wet bear Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: May 2006 Location: cannes france Posts: 920	Re: LED PPO2 Display parts query Quote: (Originally Posted by DanFountain) Sandy, Sorry about the delay in answering. The LED bar graph driver is an LM3914. -Dan wow a lm3914 good idea for a cheap hud, I remember that ten year ago a guy had even don a rebreather controler using this old chip. where can I fin details on you circuit (just for fun) regards jean mi __________________ when will I be able to think about something else then spending hours underwater, when will I be normal ? http://web.mac.com/jmurba/Site_2/home.html http://web.mac.com/jmurba/Site_3/home.html
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10th September 2008, 12:51	#4 (permalink)
koputai Subsea Systems Current Rebreather/s: MK 15.X Other CCR Other SCR Other Rebreather/s: Not Bought Yet Other CCR Other SCR Join Date: Jul 2005 Location: Sydney, Australia Posts: 350	Re: LED PPO2 Display parts query Quote: (Originally Posted by jmurba) wow a lm3914 good idea for a cheap hud, I remember that ten year ago a guy had even don a rebreather controler using this old chip. I think it was Ake Larson wasn't it? Maybe search the old NWDesigns archive. Edit: Try this, lm3914 site:nwdesigns.com - Google Search Cheers, Jason. __________________ Subsea Systems - Displays, HUDs and electronics for your rebreather.
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10th September 2008, 15:43	#5 (permalink)
DanFountain This is my custom title! Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: Dec 2005 Location: Lake Superior Posts: 113	Re: LED PPO2 Display parts query Quote: (Originally Posted by jmurba) wow a lm3914 good idea for a cheap hud, I remember that ten year ago a guy had even don a rebreather controler using this old chip. where can I fin details on you circuit (just for fun) regards jean mi Jean Mi, There was a thread on here a while back - I think bnscherm was building one - http://www.rebreatherworld.com/home-...2-meter-5.html Looking at the .pdf I posted I see that I didn't identify the driver - it is in fact the LM3914. -Dan __________________ Try not. Do - or do not. There is no try. -Yoda
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10th September 2008, 22:11	#6 (permalink)
jmurba wet bear Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: May 2006 Location: cannes france Posts: 920	Re: LED PPO2 Display parts query Quote: (Originally Posted by koputai) I think it was Ake Larson wasn't it? Maybe search the old NWDesigns archive. Edit: Try this, lm3914 site:nwdesigns.com - Google Search Cheers, Jason. exactly, thanks good old time of rock and roll . 3914, 555 excellent... __________________ when will I be able to think about something else then spending hours underwater, when will I be normal ? http://web.mac.com/jmurba/Site_2/home.html http://web.mac.com/jmurba/Site_3/home.html
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