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The most recent discussions

DROP . . .BOX [an inexact cross-post from sci.math]

October 7, 2018, 1:57 pm

https://www.dropbox.com/sh/gabop77dlx550wg/AADerU5lqy9yiFKkO0JOExzRa?dl=0 is my Dropbox link. Full although not a complete list of items [thoughts]. -Simon Roberts tinkerers Read more »

Wrong signs in three formulas of electrotechnics

September 21, 2018, 9:37 pm

Lorentz force formula F=qvB has been obtained by experiment. It can be derived from third Hertz's equation: rot E = -d/dt B - rot(v x B) if derived in such way it changes sign, F=-qvB. Another two... Read more »

Is Class 1 laser safe enough for baby eyes?

July 31, 2018, 10:21 am

I meant, what if someone accidentally shine Class 1 laser into a baby's eyes? Would it hurt retina and leave a permanent damage? I know ... I know... it should NOT happen. Adults are supposed to b... Read more »

Dimmer for 4V LED

June 29, 2018, 4:13 am

I have a 4V, 0.75A, 3W power adapter (120V input) that powers a single LED that is too bright. Is there a way to make or purchase a dimmer that could work on the low power side? Thanks -- m-m ... Read more »

MV-to-LV Connection

June 27, 2018, 10:38 am

Hello, all, and a question especially for those who work in AC power distribution: One is provided with two line-line MV (assume 34/19.9 kV or less) distribution lines (L1, L2) and a neutral (N)... Read more »

Fwd: Can LED bulbs be connected to a flasher?

May 15, 2018, 12:35 am

-------- Forwarded Message -------- Subject: Can LED bulbs be connected to a flasher? Date: Mon, 14 May 2018 14:08:24 -0500 From: Bud@Weiser.com Organization: Aioe.org NNTP Server Newsgroups: al... Read more »

jammer for 595-625 MHz

May 12, 2018, 5:42 pm

Could you help me to find this jammer, please? Read more »

URGENT Test for alternating current without multmeter

May 11, 2018, 3:27 am

I have a lenovo n22 laptop. I am posting this message on it. I was watching i a youtube video when I realized that the ac/dc adapter was unplugged, whe n I plugged it back in, my laptop made a errr... Read more »

off topic cross post

March 8, 2018, 11:14 am

an off topic cross post If you think you got it then either use it or lose it. don't expect it like it's your birthright. reiterating: 'use it or lose it' especially in the w ay your forefathers ... Read more »

I like this ... that's all

January 19, 2018, 7:58 pm

https://www.dropbox.com/s/njgmhgchxw48jtt/MIS%20three%20switches%20on%20on%20light%20bulb.tif?dl=0 Simon Read more »

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The best rated discussions

12470 to 208 transformer

rating: 5

I can't seem to find a transformer for 12470 pri to 208 sec. Any suggestions? Vendors? I've heard people talk about parallel transformers. If the turn ratios are the same and impedances are the same ... Read more »

replacing a varistor

rating: 5

I need to replace a varistor on a circuit board and I cant find any markings on a good varistor still on the board. The board consists of several triac circuits which all operate the same type of sol... Read more »

Identifying Transformer Core Overheating Problem

rating: 5

I need assistance with identifying the cause of a transformer core overheating problem. I am not an electrical engineer but I have 20 years of experience in transformer repair. The unit in question ... Read more »

Another hot tub wiring question (long) - best 3-phase service?

rating: 5
  [ 2 ]

This rather long question is directed to electricians and engineers who are familiar with wiring and service installation requirements for a commercial hot tub business. The question is what is the ... Read more »

Electrical Panel Schedule software

rating: 5

I have recently revised and updated my panel schedule software and website. Thanks to those here who helped me test and refine the program. AutoPanelboard is software that works in AutoCAD to automat... Read more »

Re: PIONEER PD-T505 schematic

rating: 5

Contact Pioneer Spare Parts and order the service manual. al. Read more »

"Growler" armature tester

rating: 5

I have recently aquired an old Allen Electric Type E30 armature tester. It's a simple device but I suspect the wiring has been tampered with/modified. Does anyone know the wiring of these devices? ... Read more »

Can Romex touch the outside of a recessed can?

rating: 5

I am installing some recessed lights into an non-insulated ceiling. 3 of the holes went fine, but when I cut the 4th hole, I discovered a bundle of three romex wires running directly across the hol... Read more »

Actual Ampacity Rating ROMEX SIMPull Type NM-B in a residential attic.

rating: 5

Please help me keep from tearing my hair out. I am installing a subpanel in an existing, small 22 by 8 foot (176 sqft) addition to my home. The original wiring was not done to code and has since b... Read more »

Help/air compressor tripping 20 amp breaker

rating: 5

I have a 58' run of 12/3 wire running to the shed that operated some lights and a small 110v sears 30 gallon air compressor nearly new. The first time or two of turning it on to build air the breake... Read more »

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