i came across this circuit while looking for a constant current source with the ability to dim the leds connected to it.
**broken link removed**
This one looks like it suits my needs perfectly. 48v @ 400ma output at 100% duty
plus it has the ability to dim the leds.
Problem is it requires a -48v supply, is there any way to do the same thing with a +48v supply.
need to keep the circuit with good efficiency, I am told that for the leds im going to use string of 24 x (2v @ 400ma), a simple current limiting resistor is no good.
**broken link removed**
This one looks like it suits my needs perfectly. 48v @ 400ma output at 100% duty
plus it has the ability to dim the leds.
Problem is it requires a -48v supply, is there any way to do the same thing with a +48v supply.
need to keep the circuit with good efficiency, I am told that for the leds im going to use string of 24 x (2v @ 400ma), a simple current limiting resistor is no good.
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