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dim/bright led when testing

 
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atlas149



Joined: 14 Feb 2011
Posts: 2

PostPosted: Mon Feb 14, 2011 11:07 am    Post subject: dim/bright led when testing Reply with quote

Hi
connected and tested the IT. I got dim leds when testing.How to get thoses leds bright .Is it a soft or hardware PB
thanks
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Jetcos



Joined: 30 Sep 2005
Posts: 1218
Location: Newmarket,Ontario

PostPosted: Mon Feb 14, 2011 4:24 pm    Post subject: Reply with quote

Are we talking B737 OH Dual Brightness annuciators?
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atlas149



Joined: 14 Feb 2011
Posts: 2

PostPosted: Tue Feb 15, 2011 5:52 am    Post subject: dim leds Reply with quote

Hi
I talking about the ALL leds in 737ng front panel:gear,autobrake ;annonciators,master caution ect...................
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JanP



Joined: 21 Feb 2011
Posts: 10
Location: Hamburg

PostPosted: Tue Mar 15, 2011 3:00 am    Post subject: Reply with quote

Hi,
any news here?
Jan
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jskibo



Joined: 15 Jul 2010
Posts: 77
Location: Florence, KY

PostPosted: Tue Mar 15, 2011 5:46 am    Post subject: Reply with quote

The MIP shouldn't have dual brighness LED's That's the overhead.
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Jetcos



Joined: 30 Sep 2005
Posts: 1218
Location: Newmarket,Ontario

PostPosted: Tue Mar 15, 2011 7:11 am    Post subject: Reply with quote

I haven't seen dim LED's here when we build them on the AN1 boards. Are you using our LED's. We use the same ones here and just finished several MIP setups and B737 OH's. No trouble.

We also use a small 3V watch type battery to test each completed AN1 before going on to the next one.
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fly_ebos



Joined: 18 Jun 2009
Posts: 5
Location: Belgium

PostPosted: Wed Mar 16, 2011 5:21 am    Post subject: Reply with quote

I have solderd my dual brightness annunciators and when I test them with a 3 volt battery, only the dim lights go on.

How can I test the bright is working properly?
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GDR



Joined: 26 Sep 2008
Posts: 308
Location: EBBR

PostPosted: Wed Mar 16, 2011 7:15 am    Post subject: Reply with quote

With dim/bright you have 2 wires linked for ground, 1 for the dim state and 1 for the bright state.

So briefly, for standard you need one wire for the ground and one for the led to be lit up. For the dim/bright you have one wire for the ground, one for the dim state and one for the bright state.

http://flightsim737.dyndns.org:8081/Docs/FDS_ANNUNS_V2_PCB.pdf

Hope this helps you further. Wink

Geert.
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http://www.flightsim737ng.be
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Jetcos



Joined: 30 Sep 2005
Posts: 1218
Location: Newmarket,Ontario

PostPosted: Wed Mar 16, 2011 7:38 am    Post subject: Reply with quote

Thanks Geert.

Geert has created a great document to assist with the dim/bright of an AN1.

Did you install the diode in the right direction? The diode is like a "one-way" valve and only allows power to travel one direction (for anyone who didn't know). This eliminates any power back-feeding to the LED's and allows the resister to lower the voltage to the LED giving the Dim lighting.

Hope this also helps?
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