Hello all, hope this is the correct place to post,
After reading this thread - http://laserpointerforums.com/f51/i-want-build-laser-thread-52972.html
I thought I would have a go at making the driver from this - Laser driver - It can be done
Got all the componets and a pcb, the only problem i had my local store (maplins) didnt have the correct pot i wanted, one close to the spec was this - Cermet Preset Potentiometers : Potentiometers : Maplin
Got it all together as per the diagram, used a normal white led to test it worked, which it didnt but as i move somthing it did light up.
bassically shorting it across regulator the + point and the middle one made it work, using a digital multi meter across the led i can adjust using the pot from 50ma up to 800ma.
So does the end result sound like how it should work ? i thought buying the 100R pot would give me 0-100ma range ? or could they have given me the wrong one ? as only came in a clear plastic bag.
Dont under stand how this isnt working without having to short it, could the regulator be not working there for shorting the + in to the middle point continued the circuit ?
Thanks
Rocky
After reading this thread - http://laserpointerforums.com/f51/i-want-build-laser-thread-52972.html
I thought I would have a go at making the driver from this - Laser driver - It can be done
Got all the componets and a pcb, the only problem i had my local store (maplins) didnt have the correct pot i wanted, one close to the spec was this - Cermet Preset Potentiometers : Potentiometers : Maplin
Got it all together as per the diagram, used a normal white led to test it worked, which it didnt but as i move somthing it did light up.
bassically shorting it across regulator the + point and the middle one made it work, using a digital multi meter across the led i can adjust using the pot from 50ma up to 800ma.
So does the end result sound like how it should work ? i thought buying the 100R pot would give me 0-100ma range ? or could they have given me the wrong one ? as only came in a clear plastic bag.
Dont under stand how this isnt working without having to short it, could the regulator be not working there for shorting the + in to the middle point continued the circuit ?
Thanks
Rocky