esa1203
07-12-2010, 06:30 PM
I am having a problem with powering LEDs by two different power sources. Basically this is just a test setup for what I intend to do with my overhead panel, roughly following Ian Sisson's ideas.
Here is a schematic I made that shows as good as possible the way I connected pieces of stripboard with either LEDs or DIODES mounted on them, through wires.
http://www.artvaark-design.com/jeroenbos/leds-problem.jpg
WHAT IS IT SUPPOSED TO DO
There are two circuits, No. 1 and 2. Circuit 1 is lighting all LEDs and can be used when switching a test switch on the overhead panel, that lights all annunciators.
Circuit 2 is used in normal operation. Switch 1, when on, will light LEDs 1. Switch 2, when on, will light LEDs 2, Switch 3, when on, will light LEDs 3 and 4. LEDs 5 is not used in this circuit.
WHAT DOES IT ACTUALLY DO
Circuit 2 does work. :)
Circuit 1 doesn't, (obviously because otherwise I wouldn't be writing this post ;))
When I provide power to circuit 2 all it does in this setup is lighting LEDs 5. When I disconnect the ground wire (brown) from LEDs5 it lights LEDs 1,2,3 & 4, but not LEDs5.
So there should be something wrong in the way I connect the ground wire. Can someone point me in the right direction with this problem? I would also appreciate any tips as in how to make the circuits more efficient.
Some other info. I use a 5V computer power supply. 5v is routed through a breakout board with 220 Ohm resistors to reduce the voltage that is send through the LEDs.
Thanks
Jeroen Bos
Here is a schematic I made that shows as good as possible the way I connected pieces of stripboard with either LEDs or DIODES mounted on them, through wires.
http://www.artvaark-design.com/jeroenbos/leds-problem.jpg
WHAT IS IT SUPPOSED TO DO
There are two circuits, No. 1 and 2. Circuit 1 is lighting all LEDs and can be used when switching a test switch on the overhead panel, that lights all annunciators.
Circuit 2 is used in normal operation. Switch 1, when on, will light LEDs 1. Switch 2, when on, will light LEDs 2, Switch 3, when on, will light LEDs 3 and 4. LEDs 5 is not used in this circuit.
WHAT DOES IT ACTUALLY DO
Circuit 2 does work. :)
Circuit 1 doesn't, (obviously because otherwise I wouldn't be writing this post ;))
When I provide power to circuit 2 all it does in this setup is lighting LEDs 5. When I disconnect the ground wire (brown) from LEDs5 it lights LEDs 1,2,3 & 4, but not LEDs5.
So there should be something wrong in the way I connect the ground wire. Can someone point me in the right direction with this problem? I would also appreciate any tips as in how to make the circuits more efficient.
Some other info. I use a 5V computer power supply. 5v is routed through a breakout board with 220 Ohm resistors to reduce the voltage that is send through the LEDs.
Thanks
Jeroen Bos