I'm building an LED Lamp and need some advice?
I am making a lamp using 7xLED lights @3.2v =22.4v
I Aim To Use A 24V Transformer But Need A Resistor To Soak Up The Remaining 1.6V.
Can You Advise Which One Is Suitable And How This Is Installed In The System?
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The commercial transformer work by supplying a constant current so as long as your LED voltages add up to less than the maximum output voltage they will drive the load without a dropper resistor. Here is an example of 350mA LED driver which will drive any series connected LEDs requiring 2.5 to 24V
The summary data states 1 to 6 LED's though, so it may not be suitable for 7 depending on the LED spec over temparture and tollerances.
This part does not specify any typical number of LED's driven but can go to a higher voltage so will drive 7 or more.
So the real question is 350mA a suitable current?
What is the transformer you are planning to use? Is this a special LED driving transformer? If so you may not need a resistor in series.