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240VAC Supply for 12 and 24 LED String

Hi,

I would like to have some circuit designs for a 240VAC Supply for
driving 12 and 24 LED strings. These can be in any one of the following
colours and their respective forward voltages Vf are at 20mA and 30mA
current:
Red 2.7V
Green 3.4V
Blue 3.4V
White 3.4V
Yellow 2.7V

Thanks in advance

LL
 
L

Luhan

Jan 1, 1970
0
Simple answer - don't do it!

Buy a DC wall-wart tranformer and rig the LED's in series sections to
match the voltage.
 
P

Paul Mathews

Jan 1, 1970
0
Hi,

I would like to have some circuit designs for a 240VAC Supply for
driving 12 and 24 LED strings. These can be in any one of the following
colours and their respective forward voltages Vf are at 20mA and 30mA
current:
Red 2.7V
Green 3.4V
Blue 3.4V
White 3.4V
Yellow 2.7V

Thanks in advance

LL

Have a look at Supertex HV8810 chip. If you don't use an isolating
transformer, you must insure that there are no accessible conductors
anywhere in the system....mains potentials can be lethal.
Paul Mathews
 
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