Constant Current LED Driver

424

07:27:49

Circuit to drive up to 5 LEDs from 12v DC. Current steady at 20mA regardless of how many LEDs are on.

published 5 years ago

Robert_Kidd

5 years ago

You’ll need at least 20V if you want to light 10 of them.

Robert_Kidd

5 years ago

I’m assuming you intent to add the other LED’s in series?

snowfats

5 years ago

This circuit has some issue dealing with a less stable voltage supply; any change in voltage is creating a pretty large change in the current on the output. This circuit also seems unable to drive a single LED with an input of 6V or below even though the forward voltage is 2V. When used with a stable power supply and fine tuned current setting this seems to work well as a hot swappable driver for a string of LEDs.

Robert_Kidd

5 years ago

So you’ve reduced number to be driven from 10 to 5 ..,,,

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