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Happy 04/01/2017 ! Hm

I built a Fender Tremolux 60 Watt amp from the schematic when I was in high school. 2 12" and 2 15" speakers will remove wallpaper! Last summer, I was asked to set up and demo a player piano at the museum. Boy, were my legs tired from those bellow pumps.... HM

Thanks for the help. I'm looking at these now. As I recall, The BlackBuck output is limited to about 5 volts and a 405 diode needs ~ 6volts. HM

I'm playing with my "tiny" etcher which I got from ebay a couple years ago. I removed the low power 445 laser and replaced it with a bigger blue. As normal, it doesn't focus to a point. I want to put in a 405 (about .7 watt) but I need a driver which puts out 6-7 volts AND has a TTL or...

I played Bluegrass guitar with a group for many years. HM

DDEN - It would be nice to try another program but I suspect that the Ithing does its own processing. I'd like to know. HM

I put a small plastic analog meter into a PS years ago. I had many Megs of resistor in line. NO PROBLEM... The meter blew itself out of the panel at 7,000 volts. It might work for you :-) HM

I got a 200 mW green years ago from Sky. It never put out 200 mW and if the temperature wasn't just right, I got about 50 mW just like right now. HM

Nice housing. I started with a plastic replica and machined all the laser stuff to fit it. Mine still has the sound board. I used a logic level Mosfet as my 2+ amp current supply (switch) from two 14500 cells in parallel. HM Pretty simple build for lower power. It's still impressive.

Looks like a big pulsed CO2 laser -- Nice ! HM

If you tip the rotating laser upward, it will start drawing an arc which will increase as you tip it up farther. Line generating lenses are available. You may be able to modify an existing level with a more powerful laser but don't look back at it. HM A lab laser with heat sinking is expensive...

When I started years ago, we were buying the newest Disk writers to harvest the red diodes to see how far we could push them. 50 mW was WOW and then we got 100 mW! Everyone was testing, building the LM317 drivers and posting graphs. 50 mW of green was way expensive. Popping balloons was a...

Now I'm wondering if the plastic IS the 12 mm slit. The Grating looks OK. HM

Poor door! - HM

Note: Anyone getting one of these should know that there is what appears to be a plastic OD filter of some unknown value behind the input slit. The use of lasers which can "pop" or burn should be diffused of the slit will cook. How do I know that? ... HM

Atom--- At present, I'm only trying to get it close and that's likely the best it will do. I used the 520 laser and the 532 is as close as needed for present on the graph. Thanks -- HM

Tonight I used a HeNe to calibrate 638 and my 520 to set my calibration. I now see that my 405, 445, 638 and 650 diodes are a bit off. I will check with my green HeNe tomorrow. HM

The war on poverty has spent a "few" bucks and we have more poverty. We doubled our food stamp program and we have more hunger. In Iowa we added 1% to our sales tax for teachers and schools and we got 3 million dollar gymnasiums. We increased our gas tax by 10 cents per gallon for our old roads...

For the first question, I install a dummy load across my adjustable power supplies. I use a 2.2K ohm to keep a small load in the regulator. HM

I got my mini Spectrometer! It's a bit of a trick to get it going BUT how do I calibrate it? This is what I read in nM: Input beam - Normal display - Flip 405 ------------ 980 ----------- 490 445 ------------ 903 -----------...