The meter is a device I would NOT run off a series resistor, though it might work it might also not work well.
A suitable 5v regulator would be a three terminal chip possibly a 7805 or a 7905 and which one depends on whether you need a common positive or a common negative supply.
Ok, so I didn't make it in time for NYE
Though I had a good (hand lit) display
Now I am working on the firing system again (without a deadline now ) and was wondering if you could help me out?
There is one more thing I'd like to change about my system and that is getting the voltage meter to work off my 12V battery.
Since I will be mounting the panel (it's not meant to be opened unless a battery would die) I don't want the 4x AA battery holder in my system and therfor I'd like your help on that 5V regulator.
That 7805 / 7905 you mentioned, how would I have to connect this? I am using common negative.
I would really appreciate if you (or someone else) could explain me or draw a little schematic how to connect it to my voltage meter.
Once I know this, I can finish my system.
Thanks in advance!
EDIT: Just looked at the datasheet CNH provided (link) and if I understand correctly I just have to get the right regulator with 5V output.
To connect: +12V to pin 1 (input), -12V to pin 2 (gnd) and then from pin 3 (output) to +5V from voltage meter, from pin 2 (gnd) to gnd from the voltage meter.
Is that correct?
Also, those regulator types/numbers (7805 / 7905), are those the same in every country or brand?
Being a foreigner I can go to the electronics store and ask for a voltage regulator with that number, right?
Edited by PyroCreationZ, 27 January 2010 - 10:21 PM.