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Preventing a voltage source from stealing from AA batteries 
electro-tech-online.com | by PowerJunkie | Tue, Apr 14
electro-tech-online.com is the #4 Blogger for LED lamp
If I touch the two wires on the battery, it's super bright. Measuring the DC voltage between the two LED pins, I'm getting 2.8v to the LED. Here's where my problem comes in: When I connect the "idiot light" to the MAF sensor, the LED lights up EXTREMELY dim, so dim that you can't really see it at all...
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