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Flashing LED circuit for monitoring remote power resource vo

2017-02-01 07:31  
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Flashing LED circuit for monitoring remote power resource voltage
This circuit uses LM3909 flasher integrated circuit produced by National Company to drive LED for monitoring the voltage of remote power resource. When the resistance of 43kohms is placed in the area of power resources, the voltage of transferring wires, integrated circuit and LED does not pass over more than 7V than ground, the voltage of remote power resource will be tested safely. And the work current should be smaller than 150mA.