Search results

No, the TEC itself has thermal mass and thermal conductivity from face to face, even when unpowered. The TEC outputs a voltage proportional to the temperature difference from face to face. The laser provides heat to one side, this energy input combined with the thermal resistance of the TEC face...

Linearity would probably be better with a load resistor, however this adds an extra step in calibration and a layer of complexity that most people who want to build this circuit likely will not be able to perform easily. The circuit was designed for measurement of lasers up to 2 watts.

Some opamps have slight offsets that may need to be compensated for. Not all, but some.

The sticker rating is for regulatory reasons and is just as a reference for "this laser cannot emit more than X power" and they use the same stickers on multiple types of heads that can output various amounts of power. As far as powering it goes, PSUs aren't hard to find and you should be able...

This circuit's zeroing only works if the meter has a separate power source than the signal it is measuring. If you use a common ground meter the zero will not work.

Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please If it's like the 473nm BW Tek Units it will require several amps at 5vdc.

Due to recent advancements in the hobbyist LPM market, I would put the value at about $50. (sorry ehgemus)

Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please Anyone in Burlingame, California? Abi Prism 3700 Applied Biosystems DNA Analyzer Sequencer Local Pickup | eBay Device appears to have a robotic sampling system along with some type of argon laser (note the...

What circuitry did you use or modify to obtain current regulation?

Speaking of such things, this bottle sits on my desk :)

Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please http://www.ebay.com/itm/Coulter-Epics-XL-MCL-Flow-Cytometer-/161206650640?pt=LH_DefaultDomain_0&hash=item2588aa4710 Coulter Epics Laser Flow Cytometer - I've taken one of these things apart and it's a...

It was just a joke, someone found out they could sell tiny fractions of doge at very high prices per coin and coinmarketcap would see these tiny transactions pass through the API and publish the data even though it was a volume of like 0.001 doge @ $400

What kind of coolant lines? Some kind of refrigerated setup? You would have to watch the dew point temperature. If the coolant goes below the dew point you will have condensation.

On the note of condensation, it should be noted that condensation only happens on a surface that is COLDER than the ambient air. Cold air cannot hold as much moisture as warm air, so when (relatively) warm air contacts a cold surface, the air can no longer hold its current moisture content and...

Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please That's a Lasos tube, the glass cathode bell is beautiful to see with the argon plasma.

I'll take the ALC 909 at SELEM 2014 if nobody else takes it ;)

Re: Radiant 4 LPM DEFECTIVE I saw some posts elsewhere about people with a similar problem. The virus scanners these days are really tweaked out to try and sniff for the faintest possibilities of malware, that a lot of stuff is falsely detected these days. I believe a new version of the...

Want to buy my account? I have a level 85 Tauren Druid on Deathwing and a few other alts, couple thousand gold. I'd let it go for pretty much nothing, I haven't played for about 3 years now.

That's a really dinky heatsink, usually when I mess with 40mm TECs I use a chunky CPU heatsink. Also removes the need for the screamer 40mm fans. Much more expensive though. It's fun to drip water on them and make little ice sculptures if you're bored.

Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please those Showwx units were $100 on woot a while back (I got one), the PSU is any wall 5v 1.5A+ with a microusb plug (it can also recharge from usb but slower) It works with the following: composite video, iPhone...