Hello my name is Mike and I am new to electronics. I have been a chief electrician for an underground coal mines for 10 years so I have a good electrical base just not much in electronics. Anyway here's my problem, I'm wanting to make a trouble shooting device using led's for a carbon monoxide monitor we use, to help some of my electricians when working on them. They have a 28 VDC supply so I have a good source for my led's. They have a pin on them that when read to ground has 235 millivolts at 0% CO. This is what I need to turn the led on because we have a potentiometer that we have to adjust occasionally. I thought of just simply using a transistor to turn on the led but then I found out that most of them have to see 700 millivolts to turn on (remember i'm new). Any help someone could give would be greatly appreciated thanks
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