[simpits-tech] controling a 28v circuit with a 5v

[Joseph Fagner]

Been there, done this already.  I did this exercise with Mike Powell a few
years ago.  Here's the little schematic he came up with.  I tested it and
works perfectly.

 



Alternatively, if you are doing several lamps, then I would suggest the
ULN2803A IC.  It's got 8 Darlington transistors each capable of sinking
500mA each.  The 20mA input line is the one coming from the MM5451, just
replace that with your input line.  The Lamp Test part you can leave out as
well, but you do need the 2.2K pull up resistor if the output voltage is
that to drive an LED, otherwise you won't trigger the transistor.

 

Thanks to Mike Powell for the design.

 

Jay

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From: simpits-tech-bounces at simpits.org
[mailto:simpits-tech-bounces at simpits.org] On Behalf Of Justin Messenger
Sent: Monday, March 24, 2008 10:22 AM
To: simpits-tech at simpits.org
Subject: [simpits-tech] controling a 28v circuit with a 5v

 

I thought about that and would be happy to go that route, but as Gene said
Im not sure if using only 20mA for the 5V would work well.

 

As far as changing lamps goes, I want to control my landing gear indicators,
they are 28v but are not lamps. However, If I get them to work then the same
system would also work to control the 28v lamp that I also want to function
(gear transition light). This is a real sim and all the lamps are 28v and I
have power going to them. I dont really want to modify them if I dont have
to due to common grounding.

 

 

yes you could run a realy?!
DU if the bulbs are re-lampable then just change the stupid lamps!
Cris

 

 Aviation Videos  

      http://HeritageAviationVideos.fly.to/

 

DC-8 Simulator

www.dc8cockpit.catisp.com

 

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