Search found 2157 matches
- Tue Jun 09, 2020 6:46 am
- Forum: General Discussion
- Topic: Possible solution!
- Replies: 6
- Views: 4138
Re: Possible solution!
I don't do twitter- what's this all about?
- Wed Jun 03, 2020 8:23 am
- Forum: General Discussion
- Topic: Monitoring for when a pump is running
- Replies: 8
- Views: 4746
Re: Monitoring for when a pump is running
CeaSaR has it- an AC current clamp in the house to monitor current to the pump. That could go to an Arduino with SD card to log pump activity. Or, depending on your programming expertise, alert you when the pump has been off or on for too long. As for an alert when the tank gets too full, many "...
- Sun May 24, 2020 3:36 pm
- Forum: General Discussion
- Topic: UVC Testing - Willing to pay!
- Replies: 14
- Views: 16926
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!
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!
- Sun May 24, 2020 5:33 am
- Forum: General Discussion
- Topic: I'm Starving here....
- Replies: 17
- Views: 8514
Re: I'm Starving here....
Watt the hell? )
- Tue May 12, 2020 3:32 pm
- Forum: General Discussion
- Topic: Superduper capacitor substitute for battery
- Replies: 12
- Views: 8335
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!
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!
- Mon May 11, 2020 6:51 pm
- Forum: General Discussion
- Topic: Superduper capacitor substitute for battery
- Replies: 12
- Views: 8335
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?
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?
- Sun May 10, 2020 3:04 pm
- Forum: General Discussion
- Topic: UVC Testing - Willing to pay!
- Replies: 14
- Views: 16926
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 ...
- Sun May 10, 2020 5:34 am
- Forum: General Discussion
- Topic: Superduper capacitor substitute for battery
- Replies: 12
- Views: 8335
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?
- Sun May 10, 2020 4:58 am
- Forum: General Discussion
- Topic: UVC Testing - Willing to pay!
- Replies: 14
- Views: 16926
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%3...
- Wed Apr 22, 2020 5:03 am
- Forum: General Discussion
- Topic: Green wire
- Replies: 4
- Views: 4685
Re: Green wire
Makes sense dyarker! Thanks!
- Tue Apr 21, 2020 4:29 pm
- Forum: General Discussion
- Topic: Green wire
- Replies: 4
- Views: 4685
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?
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?
- Wed Apr 08, 2020 7:20 pm
- Forum: General Discussion
- Topic: Help a Fellow Out
- Replies: 12
- Views: 45867
Re: Help a Fellow Out
Got a smart phone?
- Wed Apr 08, 2020 7:31 am
- Forum: General Discussion
- Topic: I-Phone to flat screen with HDMI
- Replies: 5
- Views: 6826
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.?
- Thu Apr 02, 2020 7:33 am
- Forum: General Discussion
- Topic: Wood, some of the best stuff for music
- Replies: 2
- Views: 4843
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?
Anybody ever try that?
- Wed Mar 25, 2020 5:21 pm
- Forum: General Discussion
- Topic: Citizens band (CB) Radio: Who still uses it?
- Replies: 8
- Views: 7291
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...