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Hello there,

recently I've been building an logic XOR-gate with a few N-channel MOSFETS, a few resistors and two push buttons. Everything was working fine when I put a LED on the output; It only lighted up when one button was pushed. But when I tested the Voltage across the resistor and LED with a multimeter, I saw that there were only 3.5 Volts.[ATTACH=full]198371[/ATTACH]The voltage seems to drop across R1.

Can anyone tell me why?

Thanks, AxelanDerGrosse