NChannel MOSFET/ LED circuit problems

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hi

i'm trying switch 12v leds using nchannel mosfets. i've got arduino mega2560 pull gates high , low , in 1 configuration, led between power supply , mosfet, led lights when required.

however when move led other side of mosfet, ie between mosfet , ground, doesn't

can enlighten me why second configuration fails , can make work?

many thanks
jopeno

the first schematic, must have resistor in series led.

the second:  led forward voltage + gate source voltage more  vcc, no current can flow.
replace mos transistor bipolar transistor ( , resistor ) makes work

pelle


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