Attached here is a schematic for a n-mosfet driver (along with the LTSpice schematic). To simulate the load I have an LED with a resistor. The 4N25 opto coupler is controlled through an Arduino (V3 in the schematic). Now this simulates just fine in LTSpice but when I assembled everything on my breadboard it doesn't work. The LED stays on through out. The Arduino code just switches on and off a particular pin at intervals of 2 seconds. Any ideas?
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