Search found 2095 matches

by jwax
Sun May 24, 2020 3:36 pm
Forum: General Discussion
Topic: UVC Testing - Willing to pay!
Replies: 10
Views: 723

Re: UVC Testing - Willing to pay!

Just saw this:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4702654/

Might want to contact local colleges/universities for collaboration in developing your devices. Grad students are always on the lookout for projects, and these days, what you're doing is a hot topic. Good luck!
by jwax
Sun May 24, 2020 5:33 am
Forum: General Discussion
Topic: I'm Starving here....
Replies: 5
Views: 252

Re: I'm Starving here....

Watt the hell? :))
by jwax
Tue May 12, 2020 3:32 pm
Forum: General Discussion
Topic: Superduper capacitor substitute for battery
Replies: 12
Views: 528

Re: Superduper capacitor substitute for battery

Power X Time is energy, so 1.3 AH X 2.5 volts X 1800 seconds = 5850 joules (or watt-seconds) (From the battery)

Energy stored in a capacitor is 1/2CVsquared, so, 1/2 X 1875 Farads X 2.5volts squared = 5859 joules (or watt-seconds) (From the capacitor)
Close enough!
by jwax
Mon May 11, 2020 6:51 pm
Forum: General Discussion
Topic: Superduper capacitor substitute for battery
Replies: 12
Views: 528

Re: Superduper capacitor substitute for battery

OK, I see that now, even though we know 2.6 amps for 30 minutes from a AA is pushing reality.
Time would be 30 mins X 60 secs/min = 1800 seconds.

C = T/R, so with a time of 1800, and an R of 0.96 ohm- 1800/.96 = 1875 Farads

So, who has that capacity for us to try it? :razz:
by jwax
Sun May 10, 2020 3:04 pm
Forum: General Discussion
Topic: UVC Testing - Willing to pay!
Replies: 10
Views: 723

Re: UVC Testing - Willing to pay!

Optical bandpass filters are available which only allow the UVC to pass through- similar to what Big Clive uses as a piece of glass, but bandwidth-accurate. Only guessing what wavelengths are getting through his glass plate. Are you attempting to test a finished product, or just UVC LED's? You need ...
by jwax
Sun May 10, 2020 5:34 am
Forum: General Discussion
Topic: Superduper capacitor substitute for battery
Replies: 12
Views: 528

Re: Superduper capacitor substitute for battery

I can't see where the OP expressed the current demand of said bulb. Is it a small LED? Incandescent?
by jwax
Sun May 10, 2020 4:58 am
Forum: General Discussion
Topic: UVC Testing - Willing to pay!
Replies: 10
Views: 723

Re: UVC Testing - Willing to pay!

How about getting one of these "UVI" detectors- https://www.ebay.com/i/224004559118?rt=nc&_trkparms=aid%3D1110001%26algo%3DSPLICE.SIM%26ao%3D2%26asc%3D20160908110712%26meid%3D6a7ad0fc42a2490489cd50c0aadda2ed%26pid%3D100677%26rk%3D13%26rkt%3D30%26mehot%3Dnone%26sd%3D153696105907%26itm%3D224004559118%...
by jwax
Wed Apr 22, 2020 5:03 am
Forum: General Discussion
Topic: Green wire
Replies: 3
Views: 1318

Re: Green wire

Makes sense dyarker! Thanks!
by jwax
Tue Apr 21, 2020 4:29 pm
Forum: General Discussion
Topic: Green wire
Replies: 3
Views: 1318

Green wire

Maybe too much time on my hands, but.....
In house wiring, why is the Green wire usually the same gauge as the current-carrying wires?
The green should never have current, right? So why don't they save copper and make it a smaller gauge?
by jwax
Wed Apr 08, 2020 7:20 pm
Forum: General Discussion
Topic: Help a Fellow Out
Replies: 12
Views: 3917

Re: Help a Fellow Out

Got a smart phone?
by jwax
Wed Apr 08, 2020 7:31 am
Forum: General Discussion
Topic: I-Phone to flat screen with HDMI
Replies: 4
Views: 2472

Re: I-Phone to flat screen with HDMI

Cool! But no audio to the TV, right? Audio stays on your device, i.e., phone, iPad, etc.?
by jwax
Thu Apr 02, 2020 7:33 am
Forum: General Discussion
Topic: Wood, some of the best stuff for music
Replies: 2
Views: 2207

Re: Wood, some of the best stuff for music

Very cool! Often thought of sticking a couple of probes in a tree to "listen" in on impulses that surely exist. Or ground probes.
Anybody ever try that?
by jwax
Wed Mar 25, 2020 5:21 pm
Forum: General Discussion
Topic: Citizens band (CB) Radio: Who still uses it?
Replies: 8
Views: 2334

Re: Citizens band (CB) Radio: Who still uses it?

In the late 60's, I spent a good piece of a paycheck on two 1-watt handheld, 2 channels CB walkies. Got over 3 miles range in the almost-noise-free environment of southeast Asia. Got a half-mile in western New York due to the heavy electrical traffic. That with a 4 foot long telescoping antenna. Goo...
by jwax
Fri Mar 06, 2020 6:18 am
Forum: General Discussion
Topic: Of some interest!
Replies: 6
Views: 2827

Re: Of some interest!

Indeed, wood dust/chips have been used to vary the properties of concrete!

As for that wire stripper, might contract with a local metal recycler to strip the miles of insulated wire they get in.
by jwax
Fri Mar 06, 2020 6:03 am
Forum: General Discussion
Topic: Skycool
Replies: 5
Views: 2330

Skycool

What do you think of this approach to saving energy? Hokum or real?
https://www.google.com/search?q=skycool ... e&ie=UTF-8