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docyukon(at)ptcnet.net
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 Posted: Fri Jan 17, 2014 12:30 pm Post subject: parelling two rp3 indicators |
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Message for Bob, Ref. this email you sent to me Dec. 22 2011 Conserning the capasitor on the attached drawing. What should the specs. be? I'm not up on electronic ckts. Thanks Bill S.
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 . . .
22 2011
[quote][b]
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nuckolls.bob(at)aeroelect
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| Posted: Sat Jan 18, 2014 1:49 pm Post subject: parelling two rp3 indicators |
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At 02:27 PM 1/17/2014, you wrote:
| Quote: | Message for Bob, Ref. this email you sent to me Dec. 22 2011 Conserning the capasitor on the attached drawing. What should the specs. be? I'm not up on electronic ckts. Thanks Bill S.
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A 10uf/16v would be fine . . . it's exceedinly
un-critical.
http://tinyurl.com/mee3oal
Bob . . . [quote][b]
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