Search found 2118 matches

by jwax
Thu Jun 25, 2020 4:30 am
Forum: General Discussion
Topic: searchine for 2mm JST 5P male connectors
Replies: 16
Views: 633

Re: searchine for 2mm JST 5P male connectors

https://www.ebay.com/itm/5Pcs-Mini-Micro-PH-2-0mm-JST-5-Pin-Male-Connector-Plug-Wires-Cables-200RKDN/402292285728?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D2%26asc%3D20160908110712%26meid%3D55292416fc6d4d3d89d40625a2b8e129%26pid%3D100677%26rk%3D4%26rkt%3D30%26mehot%3Dnone%26sd%3D254615671800%26...
by jwax
Sat Jun 13, 2020 1:51 pm
Forum: General Discussion
Topic: High Power Ultrasonics
Replies: 15
Views: 584

Re: High Power Ultrasonics

Nice one, CeaSaR! :)

The orchard is a few hundred yards into the woods, so no problem in anybody getting disturbed by any noises I make.

Electric fence is another possibility. Or booby traps. :)

Thanks guys!
by jwax
Fri Jun 12, 2020 7:49 am
Forum: General Discussion
Topic: High Power Ultrasonics
Replies: 15
Views: 584

High Power Ultrasonics

Anybody play around with 100 watts+ ultrasonics? Lots of generators out there for pest control, cleaners, etc., but would like to know if anybody has used such devices for large animal (deer specifically) control. Wondering best frequencies to use, power levels., etc. Many puny gadgets are available...
by jwax
Tue Jun 09, 2020 2:03 pm
Forum: General Discussion
Topic: UVC Testing - Willing to pay!
Replies: 13
Views: 1052

Re: UVC Testing - Willing to pay!

These folks know of what they speak: https://ldpllc.fr.mp-link.ch/view/?s=DFWLhuOCBfnKJWYJZSGyTT9XucPi3iBQkZWPrKLqHFqpDnOr1Tdy3fYReaYt4ERVNjOBdVKLuiPgkwFWfLC43vzUs0ZayHYPL%2fBYl9Rxm8FQmJ1OnD6brbb0dIzQNVmtLGgItygMIQGJhfgFY%2frw6LM3IMQbhnhPfeOXO64mi1OJLGVOBJz%2bhxLo4xQX%2bwCaAmcqPBv2dmkigV%2bHHSvxMPr5...
by jwax
Tue Jun 09, 2020 2:00 pm
Forum: General Discussion
Topic: Possible solution!
Replies: 6
Views: 214

Re: Possible solution!

OK, thanks! My daughter bought a paddleboard from a shop near me, and after driving 20 miles, I couldn't take the "humming" from the tie ropes any longer! Had to yell to be heard in the car above the singing ropes. Later discovered things like garden hose sections over the ropes would stop the singi...
by jwax
Tue Jun 09, 2020 6:46 am
Forum: General Discussion
Topic: Possible solution!
Replies: 6
Views: 214

Re: Possible solution!

I don't do twitter- what's this all about?
by jwax
Wed Jun 03, 2020 8:23 am
Forum: General Discussion
Topic: Monitoring for when a pump is running
Replies: 8
Views: 446

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 "Floo...
by jwax
Sun May 24, 2020 3:36 pm
Forum: General Discussion
Topic: UVC Testing - Willing to pay!
Replies: 13
Views: 1052

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: 17
Views: 902

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: 779

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: 779

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: 13
Views: 1052

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: 779

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: 13
Views: 1052

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%...