Making a Thomson Coil?

Started by Sarah Szabo in sci.electronics.design5 hours ago 20 replies

I'm interested in making a Thompson's Coil after seeing my University's physics II (EM) professor demonstrate Faraday's Law to us using it. It...

I'm interested in making a Thompson's Coil after seeing my University's physics II (EM) professor demonstrate Faraday's Law to us using it. It seems like a fun device to demonstrate various principles of Electromagnetism to lay people (Induced Voltage by Faraday's Law, Resistive Heating, Electromagnetic Levitation (Of rings), Conductivity, etc). I should emphasize that this isn't fo


OT: Trump and the US civil service

Started by Anonymous in sci.electronics.design5 hours ago 28 replies

The latest New Yorker (21st May 2018) has a depressing article about Trump's impact on the US civil service. It's titled "Only the Best People"...

The latest New Yorker (21st May 2018) has a depressing article about Trump's impact on the US civil service. It's titled "Only the Best People" and was written by Evan Osnos https://en.wikipedia.org/wiki/Evan_Osnos whom I'd never heard of. Trump clearly doesn't like civil servants, and has no interest in what they do. He wants civil servants to be personally loyal to him, and pr


HV creepage requirements on internal layers of PCB

Started by sea moss in sci.electronics.design8 hours ago 14 replies

For my day job I'm attempting to design a planar transformer for an LLC converter, which pushes up to 50W. The tricky part is that some of the...

For my day job I'm attempting to design a planar transformer for an LLC converter, which pushes up to 50W. The tricky part is that some of the secondary windings require 3.5kV of isolation between them. This will go on a board which will be potted, and we use 100V/mil clearance and 20V/mil creepage as our design rules for everything once it's been potted. However, I'm trying to figure out w...


Mantis stereo microscope ??

Started by mpm in sci.electronics.design9 hours ago 13 replies

Do any of you use a Mantis scope? http://www.visioneng.us/products/stereo-microscopes/mantis-elite-cam-hd-with-camera I've got a couple...

Do any of you use a Mantis scope? http://www.visioneng.us/products/stereo-microscopes/mantis-elite-cam-hd-with-camera I've got a couple $,000 burning a hole in my pocket and I've been looking for a GOOD low-magnification inspection scope for PCB's and what-not. Supposedly, the Mantis line of inspection scopes is the "Industry Standard". (??) I would really appreciate any feedback (goo...


Mundane resistors out of stock, what's going on?

Started by Joerg in sci.electronics.design10 hours ago 86 replies

A layout took a bit longer so after getting burned by a non-stock CAM hold last time I went through the BOM again before we go to fab. 1/3rd...

A layout took a bit longer so after getting burned by a non-stock CAM hold last time I went through the BOM again before we go to fab. 1/3rd of the resistors and caps went out of stock over the last two weeks! They were in stock when I created the BOM a couple of weeks ago. We are talking 2k 1% in 0805 and so on. It's almost like the local supermarket running out of potatoes. Which can h...


In Doubt - Circuit Values

Started by Anonymous in sci.electronics.design10 hours ago 20 replies

This is part of a piece of equipment that is to detect a short. The FUT will be a capacitor. It is not the only function of the unit, I am working...

This is part of a piece of equipment that is to detect a short. The FUT will be a capacitor. It is not the only function of the unit, I am working on the rest. This seems so simple but I have doubts for some reason. Since I am learning LTSpice finally. R 5 & 6 set the input at ½ Vcc. R 3 & 4 set the emitter of Q 1 low enough to assure saturation - I think. Seems like it anyway.


Alan Bean

Started by Tom Del Rosso in sci.electronics.design12 hours ago

Alan Bean, the man who knew where the SCE switch was, died today at 86. --

Alan Bean, the man who knew where the SCE switch was, died today at 86. --


Explosion- Proof Camera

Started by Alvira Khan in sci.electronics.design18 hours ago 9 replies

By installing #explosionproofcameras, you can improve your employees’ safety through constant work environment monitoring. Read on to know...

By installing #explosionproofcameras, you can improve your employees’ safety through constant work environment monitoring. Read on to know how: https://bit.ly/2rZIdxS


Tesla news

Started by John Larkin in sci.electronics.design22 hours ago 92 replies

https://www.zerohedge.com/news/2018-05-21/elon-musks-great-model-3-bait-and-switch How many greenies plan to drive a model 3 "on the...

https://www.zerohedge.com/news/2018-05-21/elon-musks-great-model-3-bait-and-switch How many greenies plan to drive a model 3 "on the track"? -- John Larkin Highland Technology, Inc lunatic fringe electronics


Fast comparators

Started by George Herold in sci.electronics.design1 day ago 23 replies

Hi all, so this will turn my spad pulse into the digital world. I was looking at this...

Hi all, so this will turn my spad pulse into the digital world. I was looking at this page, http://www.analog.com/en/products/analog-functions/comparators/high-speed-comparators-lessthan-1 00ns-propagation-delay.html I'm not sure about the output voltage. We may want 5V so I stuck with those. Then I wondered about LVDS. I don't think I want this either. Unless you're 'allowed' to hook


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