OT: Trump's UK Visit

Started by Cursitor Doom in sci.electronics.design1 day ago 356 replies

Just out of curiosity and to have my suspicions confirmed, I've been watching the TV coverage of Trump's visit to Britain and just as I...

Just out of curiosity and to have my suspicions confirmed, I've been watching the TV coverage of Trump's visit to Britain and just as I thought, virtually all of the usual suspects in the mainstream media are focusing on the demonstrations against his him, trying to make it look as if everyone in the UK detests Trump and everything he stands for. As expected, CNN, the BBC and rest of thi...


Electric start for suitcase inverter generator by using its alternator as a BLDC motor?

Started by Johnny B Good in sci.electronics.design2 days ago 35 replies

I'm posting here in the hope that I can get some guidance on how to add an electric start feature to a cheap inverter generator cursed by the...

I'm posting here in the hope that I can get some guidance on how to add an electric start feature to a cheap inverter generator cursed by the traditional recoil pull starter (the Devil's invention, imho). Apologies beforehand for what is a rather long initial post but I thought it best to appraise you of my thoughts and what I know of the problems involved in my proposed electronic add-...


VOIP Phones

Started by Anonymous in sci.electronics.design2 days ago 7 replies

I am virtualizing my office and as part of that I want to take my landline number on the road. I could simply forward it to my cell phone leaving...

I am virtualizing my office and as part of that I want to take my landline number on the road. I could simply forward it to my cell phone leaving me with a monthly bill that is still under $20. I have considered a separate VOIP phone but even if wireless (like the old cordless phones) they seem to be intended to replace the desk phone rather than being a true roaming, pick up wifi


multilayer PCB

Started by John Larkin in sci.electronics.design2 days ago 13 replies

https://www.dropbox.com/s/yibz36f0ex7z1sp/MOV02429.MPG?dl=0 That board has some layers of FR4 and some microwave laminates. -- John...

https://www.dropbox.com/s/yibz36f0ex7z1sp/MOV02429.MPG?dl=0 That board has some layers of FR4 and some microwave laminates. -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com


It's the capacitance, stupid

Started by George Herold in sci.electronics.design2 days ago 48 replies

So my HV reset circuit for a spad (photodiode) crashed and burned. I'd somehow over looked the fact that the switching element was going to...

So my HV reset circuit for a spad (photodiode) crashed and burned. I'd somehow over looked the fact that the switching element was going to add capacitance to the photodiode. Rough Asci art, HV--current---+---+ limit | | | switch R-quench Rq | (pnp)


OT: Mysterious Tesla Storage Discovery

Started by Cursitor Doom in sci.electronics.design2 days ago 20 replies

https://tinyurl.com/y82p7ubx -- This message may be freely reproduced without limit or charge only via the Usenet protocol....

https://tinyurl.com/y82p7ubx -- This message may be freely reproduced without limit or charge only via the Usenet protocol. Reproduction in whole or part through other protocols, whether for profit or not, is conditional upon a charge of GBP10.00 per reproduction. Publication in this manner via non-Usenet protocols constitutes acceptance of this condition.


Coil trips RCD/GFCI

Started by Anonymous in sci.electronics.design2 days ago 51 replies

A 1946 mains vibrator electrically consists of a large coil with moving centrepiece. 240v 240 ohms measured, 10w (according to rating plate). It...

A 1946 mains vibrator electrically consists of a large coil with moving centrepiece. 240v 240 ohms measured, 10w (according to rating plate). It works flawlessly, but often trips the 30mA RCD when switched off. 500v inuslation testing shows no problem. I assume it has no built in snubber. I'm not working out why it trips the RCD. Any ideas? NT


74AC14 TDR

Started by amdx in sci.electronics.design2 days ago 41 replies

I ordered a built 74AC14 TDR square wave generator. It has overshoot and ringing, 2 or 3 cycles. Is there any way to tame it with out...

I ordered a built 74AC14 TDR square wave generator. It has overshoot and ringing, 2 or 3 cycles. Is there any way to tame it with out increasing rise time? I added a 33pf across scope side input, it helped but increased rise time. Before and after pictures, > https://www.dropbox.com/s/t5y0jfrmbxaqs0o/risetime.png?dl=0 Not sure it matters, I would just like a nice rising edge to s


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