Recent content by LarryDFW

I like the massive heatpipe heatsink . Very nice integrated design work.

I am long-time member & supplier of lithium ion cells. Now stocking new 21700 cells.

I just saw this Infocus INL3148 laser projector that uses a color phosphor wheel with Red, Green & Blue segments. Of course the Blue segment may be clear, but the fact that it has Red & Green phosphors & has 5500 lumens, may mean higher power Laser diodes. Anyone seen any projectors with these...

Check the Q-switched Nd:YAG model StyroPyro demoed on YouTube. It definitely removes rust.

Just an update : New UV Leds I received a week ago are now 60% efficient.

Looks like a nice compact driver. One thing I would recommend is some epoxy to take the stress off the laser diode leads. Don't want to break the diode !

Only buy quality cells from authentic manufacturers. Sanyo/Panasonic, Samsung and LG have been subjected to UL1642 testing for safety.

I would also run the two bars in series (2.5 VDC each). One thing I would caution you on, is that Red diodes are sensitive to turn-on and turn-off spikes from power supplies. So insure that the SMPS has a stable output. You can regulate the 2.5 VDC @ 40 amps by adjusting the wire size...

Matt; Forget the two AA batteries . . . Get an 18650 lithium ion cell. It can be recharged hundreds of times and will fit hosts for future builds. LarryDFW

Just received shipment of the new 10 amp discharge rated Sanyo 3500mah cells today. Measured the Internal Resistance @ 26 milliohms . A very good spec, since the previous 3400mah cell was ~50 milliohms. Noticed that they have raised the positive terminal enough that they will work end-to-end in...

Analyzing Chargers do give you more information about your cells. I use my Analyzer to give internal resistance levels for many different age cells. The new Sanyo NCR18650 3500mah cells measured @ 30 milliohms on my analyser. That is much better than the 3400mah cells . . .

olympus; I think you are misreading some of the Samsung cells. The ICR18650-30B cells only have a 6 amp rating (the 30 refers to 3000mah). High-current cells are only desired when you have current requirements over ~ 10 amps . . . since they are lower capacity. The newest 3500mah Sanyo cells...

New technology by Sanyo/Panasonic NMR cells lower the Internal Resistance . . . allowing higher current capabilites . . . both for discharge and charging. Amazing 260Wh/kg Power Density

I used a 3 amp driver as customer wanted continuous operation capability. From using lots of 18650 cells in stressful applications, the best method for matching cells is Internal Resistance with your cell analyzer/charger. I have gone thru ~500 cells in various projects.

I've been using Sanyo cells for about 10 years and have not seen any with grey shrink-wrap. So they're either re-wrapped, or fakes. Pry up the shrink-wrap and look for Red underneath.