Thread: 250mW LASER stuck on
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12-07-2009 #9
Hank,
Many thanks again.
I think I'd better leave this for today.
I couldn't find a pot to make a divider into the gate... until I realised there was one on the LM317's adjust line that I could 'borrow' for a bit.
There's me thinking that the gate won't take much current...
There's me thinking that the little 20 ohm trimpot will be fine.
There's me, connecting a 20 ohm trimpot straight across 12v.
There's melting plastic oozing out of the sides.
<sigh> Life is a learning experience.
Ah yes. The smell of burnt plastic makes me remember Ohms law. V=IR. A 12 volt drop across 20 ohms is... 0.6A
I'll find something other than a 20 ohm trimpot in the next few days, and see what the actual cutoff voltage is...
Keith.
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