Dispersion in Coax

Started by George Herold in sci.electronics.design2 hours ago 9 replies

Hi All, this is a question from a physics demo group that I'm passing on to you. Here's the question. One of my prof's want to do a...

Hi All, this is a question from a physics demo group that I'm passing on to you. Here's the question. One of my prof's want to do a demo where you input a square wave into a very long coax cable and look at the output of the cable with an oscilloscope to see that the high frequencies are traveling faster than the low frequencies. Anyone in Tapper land do an experim


Tomorrow's battery medium

Started by Anonymous in sci.electronics.design2 hours ago 92 replies

This will change a lot.

This will change a lot.


guard ring?

Started by John Larkin in sci.electronics.design3 hours ago 27 replies

I'm still iterating on my high-voltage pulse generator. Rev C looks very good. I've been pushing it up voltage and frequency (like,...

I'm still iterating on my high-voltage pulse generator. Rev C looks very good. I've been pushing it up voltage and frequency (like, 1200 volts and 4 MHz) and seeing what parts fry, and working on them. I have a dpak schottky diode in a sort of snubber place. According to Spice, it shouldn't get too hot, and it's soldered to all sorts of copper pours and thermal vias and stuff. It's an S...


really fast buffers

Started by John Larkin in sci.electronics.design3 hours ago 93 replies

I'm designing a test board for a laser controller. Incoming signals, fast 5 volt pulses, will need to get routed to scopes, counters, and some...

I'm designing a test board for a laser controller. Incoming signals, fast 5 volt pulses, will need to get routed to scopes, counters, and some other stuff. It will be kind a maze of connectors and traces and probably relays; it's hard to beat a relay as a test path switch. But life would be a lot better if I could fan out some of the signals at their input connector. I want a zero-delay, ze...


OT: impress your dinner guests

Started by John S in sci.electronics.design5 hours ago

https://tinyurl.com/y9cpq4uh

https://tinyurl.com/y9cpq4uh


various OTs

Started by John Larkin in sci.electronics.design6 hours ago 48 replies

https://wattsupwiththat.com/2018/10/12/another-space-telescope-shuts-down-one-week-after-hubble/ Gyros, reaction wheels, seem to be a...

https://wattsupwiththat.com/2018/10/12/another-space-telescope-shuts-down-one-week-after-hubble/ Gyros, reaction wheels, seem to be a chronic problem in satellites. I have a friend who designs cubesats, and he says that the gyros are the most expensive and unreliable parts. They should be redundant, or redesigned, or something. =========== Another friend, a Fellow of a giant areospac


Critical Update on Cellphone Safety

Started by Robert Baer in sci.electronics.design7 hours ago 6 replies

Quoted from the Manward Press.. Critical Update on Cellphone Safety By Andy Snyder, Founder Rooster's Crow It's a victory for the...

Quoted from the Manward Press.. Critical Update on Cellphone Safety By Andy Snyder, Founder Rooster's Crow It's a victory for the free market. The new FCC commissioner, Michael O'Rielly, is working to eliminate the rules that tell networks how much and what sort of kid-friendly content they must run. The old rules don't work (obviously), and channels not affected by the rules ar...


3 cent microcontroller

Started by Klaus Kragelund in sci.electronics.design7 hours ago 28 replies

Amazingly, there is such a thing as a microcontroller that goes for less than a dirt cheap logic IC 3 cents in...

Amazingly, there is such a thing as a microcontroller that goes for less than a dirt cheap logic IC 3 cents in volume: https://www.youtube.com/watch?v=VYhAGnsnO7w Cheers Klaus


OT: Saudi Arabia

Started by bitrex in sci.electronics.design9 hours ago 62 replies

Hopefully da Trumparino tell Saudi Arabia to get fucked in the nuts! Should have been done a long time ago...

Hopefully da Trumparino tell Saudi Arabia to get fucked in the nuts! Should have been done a long time ago...


Ferrite rod, side by side or in line

Started by Klaus Kragelund in sci.electronics.design10 hours ago 50 replies

Hi Trying to get good coupling between to ferrite rods with a winding on each I tested with side by side, like...

Hi Trying to get good coupling between to ferrite rods with a winding on each I tested with side by side, like this: http://www.n9ses.com/wp-content/uploads/2016/03/CAM00316.jpg Compared to aligning the 2 ferrite rods inline, end to end I have tested it and get better coupling end to end But I would like to do some what if experiments, so would like to simulate it, including the ...


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