Generator harmonics question(s)

Started by Anonymous in sci.electronics.basics2 months ago 3 replies

Years ago I adjusted a neighbor's generator so that it put out 60 cycles at 120 volts. I used a TEK 465B 'scope to look at the frequency. I...

Years ago I adjusted a neighbor's generator so that it put out 60 cycles at 120 volts. I used a TEK 465B 'scope to look at the frequency. I saw the major 60 cycle waveform and then a lot of smaller waveforms at higher frequencies. I was told that these harmonics were typical of small generators. Today I am replacing the voltage regulator on a small generator and adjusting the governo...


Test

Started by ehsjr in sci.electronics.basics2 months ago

Testing.

Testing.


Splattering solder into eye?

Started by Peter Hucker in sci.electronics.basics2 months ago 44 replies

Has anyone ever actually been unlucky enough to get solder splattering into their eye? I've had it hit my leg, hand, and face, but never in my...

Has anyone ever actually been unlucky enough to get solder splattering into their eye? I've had it hit my leg, hand, and face, but never in my eye. How bad is it? -- http://www.petersparrots.com http://www.insanevideoclips.com http://www.petersphotos.com Confuscious say: "War doesn't determine who's right. War determines who's left."


Tesla eSemi Can Haul 22 Tons From LA To Sandy Eggo On $2.00 Worth of Solar "Fuel"

Started by Bret Cahill in sci.electronics.basics2 months ago

Boggles the...

Boggles the spreadsheet. https://electrek.co/2017/11/16/cheapest-electricity-on-the-planet-mexican-solar-power/ http://www.popularmechanics.com/cars/trucks/a13787133/tesla-semi-truck-reveal/?src=nl&mag=pop&li st=nl_pnl_news&date=111717


What are the basics of electronics?

Started by Mr. Man-wai Chang in sci.electronics.basics2 months ago 23 replies

Let's return to related topics. :)

Let's return to related topics. :)


What is the color code for a -10 ohm resistor

Started by Anonymous in sci.electronics.basics2 months ago 20 replies

What is the color code for a -10 ohm resistor. That's a NEGATIVE 10 ohm resistor, not a standard (positive) 10 ohm brown-black-black resistor....

What is the color code for a -10 ohm resistor. That's a NEGATIVE 10 ohm resistor, not a standard (positive) 10 ohm brown-black-black resistor. (Thats 10 ohms below zero ohms).


fan motors

Started by Anonymous in sci.electronics.basics2 months ago 18 replies

What kind of ac motors are in oscillating fans and 20-inch box fans (the ones with capacitors)? Thanks, Michael

What kind of ac motors are in oscillating fans and 20-inch box fans (the ones with capacitors)? Thanks, Michael


contact surface material

Started by malua mada! in sci.electronics.basics2 months ago 14 replies

I made an exposed lid switch consisting of two mating pairs of flat brass stock about 1 x 1/2 inches. When I close the lid they make contact and...

I made an exposed lid switch consisting of two mating pairs of flat brass stock about 1 x 1/2 inches. When I close the lid they make contact and 12VDC flows into 2.5 ohms worth of nichrome heating wire. The idea being NOT to have live voltage exposed when the lid is open. Also, wire fatigue was causing problems. However, the contacts get dirty. They develop carbon scabs and get hot.


Why are computer power supplies like this?

Started by Anonymous in sci.electronics.basics2 months ago 12 replies

I noticed this before and again last night. I am changing plugs from a bad supply to a good one. There is a connector with 20 or so wires that...

I noticed this before and again last night. I am changing plugs from a bad supply to a good one. There is a connector with 20 or so wires that plugs into the motherboard. 6 different color wires. But all the wire of a poarticular color go to the same trace on the power supply circuit board. So all the reds to one trace, all the yellows to another trace and so on. So why all the different wire...


Dielectric Grease

Started by Bret Cahill in sci.electronics.basics2 months ago 18 replies

I had a poorly soldered wire acting up. I smeared some Permatex tune up grease on it and it solved the problem. It doesn't seem to be a good...

I had a poorly soldered wire acting up. I smeared some Permatex tune up grease on it and it solved the problem. It doesn't seem to be a good conductor except when 2 metal contacts coated with it actually touch, then the resistance drops noticeably as compared to the dry electrodes. Bret Cahill


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