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docyukon(at)ptcnet.net
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 Posted: Thu Dec 22, 2011 9:02 am Post subject: parelling two rp3 indicators |
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I am wanting to parllel two Ray Allen RP3 led position indicators useing only one POS5 position sensor. RAC said that thay wont work just parelling them and that I need to add another position sensor or a switch which I would rather not do. Can anyone sudjest an electrical ckt. that would work for this? Thanks Bill S.
[quote][b]
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nuckolls.bob(at)aeroelect
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| Posted: Thu Dec 22, 2011 4:23 pm Post subject: parelling two rp3 indicators |
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At 10:59 AM 12/22/2011, you wrote:
| Quote: | I am wanting to parllel two Ray Allen RP3 led position indicators useing only one POS5 position sensor. RAC said that thay wont work just parelling them and that I need to add another position sensor or a switch which I would rather not do. Can anyone sudjest an electrical ckt. that would work for this? Thanks Bill S.
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You need a 'buffer-amplifier' between the position
feedback potentiometer and ONE of the two indicators.
The problem with paralleling the two indicators arises
from the fact that they're not a 'high impedance' voltmeter.
The system is calibrated for one pot driving one indicator.
Adding a second indicator doubles the load on the position
signal from the potentiometer.
The 'fix' is to convert one of the indicators into a
high-impedance voltmeter. You need an operational
amplifier with rail-to-rail inputs and outputs. A device
like the LM7321 would probably work.
http://search.digikey.com/us/en/products/LM7321MF%2FNOPB/LM7321MFCT-ND/1878646
Adding this device to the second indicator prevents
it from loading the potentiometer. You need to
fabricate something like this . . .
http://aeroelectric.com/Pictures/Schematics/Ray-Allen_Dual_Indicators.pdf
It could be fabricated on an etched circuit board
that would fit inside a d-sub connector back shell.
Bob . . . [quote][b]
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