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Micro-Solar LED Desk Lamp | 40 comments (40 topical, editorial)

Re: Micro-Solar LED Desk Lamp (3.00 / 0) (#14)
by claude on Fri Feb 8th, 2008 at 06:09:12 AM MST
(User Info)

see this one: http://www.dprg.org/tutorials/2005-11a/
or, http://www.uoguelph.ca/~antoon/circ/pwm555.html

It's simple to make. One thing is that it won't go down to 0% or up to 100%. You could adjust (by using germanium type diodes) the output in between 2% -- 99 %. It's good enough for me.

I made it and used it along with a LM117 voltage regulator and a MOSFET-based current limiter and so I got a regulated voltage&current driver + PWM adjustment. Sweet.

It all looks like this (to the right, the 555-based PWM):

[ Parent ]

Re: Micro-Solar LED Desk Lamp (3.00 / 0) (#15)
by claude on Fri Feb 8th, 2008 at 06:11:47 AM MST
(User Info)

Oh, I forgot, the three pins on the far side are for connecting the 50K Pot.

Claude

[ Parent ]

Re: Micro-Solar LED Desk Lamp (3.00 / 0) (#16)
by Bruce S (bruce(dot)stahl <at>gmail (dot)(com)) on Fri Feb 8th, 2008 at 07:04:50 AM MST
(User Info)

Claude;
Thanks for the circuits. Will be another one to try out. I like nice/simple and easy :-)
Will bread board it up for a good test.

Thanks Again
Bruce S

[ Parent ]

Micro-Solar LED Desk Lamp | 40 comments (40 topical, 0 editorial)

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