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Can is be really 60W if the input power is only 3v*70A=210W? That's almost 30% efficiency! I thought DVD diodes were only about 10% efficient max. Is it possible to get up to 30%??

I drew up plans for a laser lawn mower when I was 10. I didn't have the laser, though! I'm sure it would need to be in the few-watts range to cut fast enough. Plus it has to be a color readily absorbed by green grass, so NOT green! I think red and infrared would be fine.

Thanks for the info. It's good to see that Benm got the same result I expected: That doubling the current at 50% d.c. doesn't really increase the apparent intensity for the DVD diodes due to the linear slope. The pulsed power being a better burner is interesting, though. Good to see the power...

Hi all,  I just measured my red DVD LD power and Bluray LD power yesterday -- Luckily we've got a few Scientech Laser Calorimeters in my lab at MIT - We use them for measuring millimeter wave sources, "Masers".  I don't know when/if they are calibrated right, though, as the numbers came out...

Some replies... Hi folks, thought I'd reply to a few remarks on this thread. First of all, the silicon SERIES blocker will drop 0.7v.  You're right that a PARALLEL Si diode won't drop 0.7v from the battery to the diode.  Though I have seen some of you put a resistor in series with a battery...

SORRY BAD BOTTOM SCHEMATIC!! The bottom schematic is WRONG -- SORRY! The 3.3M resistor should be on the battery side, not the regulator side. The below one is right. Also, I'm not a big fan of the LM317T due to it's voltage drop and inflexibility. There are plenty of other great regulators...

Sample simple circuits::: Below are some simple circuits you can build using this p-MOSFET blocker.  The top one is your conventional LM317T current source diode driver with a switch and p-MOSFET blocker. The bottom one uses thep-MOSFET as BOTH a battery blockers and a TOUCH SWITCH (a la...

Forgot to add... BTW, the cyan line in the figure is the voltage DIFFERENCE between the battery and load. We want that to be small and it is. Only 0.045v drop at 3v/100mA. 8-)

Hi folks!  Been watching this forum for a few months, but it's my first post! Anyway, I'm working on a crazy Blu-Ray pointer circuit that I'll describe more later, but I wanted to share an idea with you DIYer's who are still using silicon diodes to protect from putting the batteries in...