DCS317(at)aol.com
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 Posted: Wed Mar 04, 2009 9:05 am Post subject: Circuit for driving LED warning lights from differential pre |
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aeroelectric-list:
I need a circuit (the receiver) for driving LED warning lights from differential pressure transmitter. The differential pressure transmitter has an output of at the low pressure end of 4 mA varying continuously to 20 mA at the high end. 12 volt DC system (aircraft battery) is the power supply. The transmitter can withstand 35 volts DC. The total circuit (receiver) resistance should be 100 ohms, given by the formula R Max = (V of power supply minus 10.0) divided by 20 mA DC . I would like to have the circuit (the receiver) with flashing superbright red LED on at the lower range (adjustable "ON point"), flashing superbright yellow at mid-range (adjustable "ON point"), and superbright green at high range (adjustable "ON point"), each lit only when the pressure is in its respective range. A dimmer sub-circuit would also help! One terminal of the pressure transmitter connects to the positive terminal of the 12 volt power supply (aircraft battery) and the other terminal of the pressure transmitter connects to the receiver ("circuit") and from the receiver to the negative terminal of the 12 volt power supply. I.e., simple series arrangement.
Any help would be appreciated. Point me to sources (books or articles or posts) or email me a circuit? I have a basic knowledge of electronics.
Don Schmiesing RV-8 N417DS
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