nigelmercier
New Member
I've made an LED lamp that I run from a nominal 12V (range 11.8V to 14.2V); there are over 20 LEDs in it. Because of the possible voltage variation I incorporated a 7812 regulator.
At first I used groups of 3 LEDs and a dropper to give 20mA, but the LEDs kept blowing, so I removed one LED from each chain and used a different dropper, but the LEDs still keep blowing.
I think I want to do this properly: the 7812 is not very efficient, and driving LEDs hard from a fixed voltage is not a good idea.
Can anyone suggest a suitable boost converter that might give me 60V+ at constant current of around 20mA?
At first I used groups of 3 LEDs and a dropper to give 20mA, but the LEDs kept blowing, so I removed one LED from each chain and used a different dropper, but the LEDs still keep blowing.
I think I want to do this properly: the 7812 is not very efficient, and driving LEDs hard from a fixed voltage is not a good idea.
Can anyone suggest a suitable boost converter that might give me 60V+ at constant current of around 20mA?
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