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I will get a picture of the scope traces and post them up tomorrow. I fully understand what you are saying about the current being the same through the diodes as the resistor and that's why this circuit has me confused because the scope showed a voltage square wave, 0-9v, across the resistor...
It is a series circuit, 3 series diodes and a 59 ohm resistor in series as well. Is it possible that ringing on the gate could cause the gate to stay open enough to allow a few mA to flow through and develop voltage across the diodes (1v) with only a few mV across the resistor?
I'm designing an IR transmitter for a college project based on binary fsk. I'm using an astable 555 timer running at 126KHz to directly drive a N-Channel mosfet. Vs in this project is 9v. I have 3 IR diodes in series with a resister connected to a Vs. The mosfet is on the low side of the circuit...
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