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Author Topic: led prototype wiring  (Read 1329 times)
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ok will get on the ground lead and do as you ask,
 i cleaned the board with techspray cloth from eltron electronics.
made up of 90% isotropy  alcohol. so there is no residue on the board.
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i have wired the 12v GND direct to MOSFET pin and i still get the same dim light when off, using only 3 led strip
i have checked under magnifying glass, and cleaned the gaps between solder joints,
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Well, I'm sorry, normski, I'm baffled.
That there is this dim state when it should be off means that there is conduction through the FET in the Off-state (G = 0V).
Whether that's attributable to some Drain-Source degradation or a problem with the Gate is hard to say.
You have the 10K from Gate to Source (Gnd) so that should, so to say, "bleed off" any remnant charge on the Gate.
(I suggested  trying a lower value, 5K, using two 10K resistors in parallel).

If I had it here, I'd get the voltmeter on it and look at the Gate voltage and a simple digitalWrite routine (HIGH, delay, LOW, delay,...)

Instead of connecting to an Arduino pin, what happens when you Ground the 220Ω resistor (the end that would go to the Arduino pin)?



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Have a look at this simple fet led driver..........


* fetdriverstage.jpg (28.3 KB, 490x587 - viewed 20 times.)
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i have it connected to 5 x one meter lengths now and they go out no problem, will keep my eye on it for a week or so and see how it goes. I have it dimming over a 3 hour period on each color, and starting up over a 3 hour period.
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