StefanFS
Flashlight Enthusiast
Wo kauften Sie die bestandteile/komponenten? They want to know where you got the components, like the 1 mOhm linear pot.
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Wo kauften Sie die bestandteile/komponenten? They want to know where you got the components, like the 1 mOhm linear pot.
Which FETs are you using? Logic level I assume. Also, do you have a pic of the scope trace at the gate pin (555 output). I'd be interested to see what the switching wave form looks like.
it is a very easy circuit. i have fine tuned it via my oszi. i take the lowest possible switching frequency that will not flicker. i know that the knop of the pot is very nasty, but untill now i didn´t find a beatyfull one - any ideas?
Which FETs are you using? Logic level I assume. Also, do you have a pic of the scope trace at the gate pin (555 output). I'd be interested to see what the switching wave form looks like.
Awesome light.
Nice. Looks like you're drving the hell out of the gate. Nice vertical switching transitions. I wouldn't have thought the 555 could source/sink that much current to to drive the gates of 3 large FETs. The IRF3803 isn't a logic level FET though. It still shows only 0.009 Ohm Rds(on) at 4.5V which is pretty darned good. What is your gate voltage? Is it the pack voltage? Just curious. Looks like things are switching well even at a lower than optimal gate voltage. Is the low gate voltage the reason you're using multiple FETs? Becaue of the increased ON resistnce, therefore more heat, due to lower gate drive voltage?here the screenshot from the oszi:
i used hex-fets type irl3803
markus
That's a beautiful light. Would you be willing to tell us how much money you put into making her?