jeeep Posted May 16, 2007 Report Share Posted May 16, 2007 Heres what I have:12VDC Supply Voltage3VDC Voltage Drop20ma LED Current I used to think that the Total LED Voltage Drop should equal the Supply Voltage. But after doing some research I found that the Total Voltage Drop should be less than 80% of the Supply Voltage.So the correct circuit would look like this:3 LED's in series with a 150ohm resistor and a 12VDC Supply Voltage.My questions are this: does the resistor actually lower the voltage? and what would be the problem if 4 leds with the same Voltage Drop were used? Quote Link to comment Share on other sites More sharing options...
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