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Bruce Carsten's 'EMI Sniffer Probe'

I've many times made ad hoc sniffer coils for hunting out EMI & found them invaluable. This more-refined implementation...
10 comments posted 6yrs
posted by dagmargoodboat
10 comments posted 6yrs posted by dagmargoodboat

PID Controller Design for Ventilator

I understand the basics of PID design, but if you can't describe the thing being controlled, how can you design the con...
80 comments posted 6yrs
posted by gnuarm.deletethisbit
80 comments posted 6yrs posted by gnuarm.deletethisbit

Google evilness again

Just this minute, Google Groups has started requiring a login just to _read_ Usenet. Going through my browser history,...
45 comments posted 6yrs
posted by pcdhSpamMeSenseless
45 comments posted 6yrs posted by pcdhSpamMeSenseless

mask sterilization

https://www.sciencedaily.com/releases/2020/08/200806164654.htm https://youtu.be/o7-k0EIR0To The University of Illinois,...
55 comments posted 6yrs
posted by legg
55 comments posted 6yrs posted by legg

Simple circuit to latch a single pole relay?

I?ve so far not found what I?m seeking in either my own arc hived notes or a fair amount of googling, but suspect it wi...
15 comments posted 6yrs
posted by terrypingm
15 comments posted 6yrs posted by terrypingm

When did high-voltage transistors become common?

About 50 years ago, I was asked to make a high voltage constant current supply for a medical research lab. The requirem...
24 comments posted 6yrs
posted by nobody
24 comments posted 6yrs posted by nobody

OT: "Pat Pending"

When I was a boy I used to see "Pat. Pending" written on everything from consumer electronic enclosures to those triang...
23 comments posted 6yrs
posted by user
23 comments posted 6yrs posted by user

Newish pHEMTs for 12 and 20 GHz

(Forked from the debouncer thread) > > >> >>> >>> >>>> >>>>>> >>>>>>>> >>>>>>>>> Why do you need to debounce? >>>>>>>>>...
3 comments posted 6yrs
posted by pcdhSpamMeSenseless
3 comments posted 6yrs posted by pcdhSpamMeSenseless

Flex circuits

What's the process in a flex circuit fab? How extensive (costly) is the tooling? Is there a *practical* incentive to se...
4 comments posted 6yrs
posted by blockedofcourse
4 comments posted 6yrs posted by blockedofcourse

Warning about Tenma benchtop linear power supplies

Over the past couple of years, I'm seeing a lot of dead Tenma linear power supplies coming in to my shop. By a lot, I m...
4 comments posted 6yrs
posted by jimbmacarthur
4 comments posted 6yrs posted by jimbmacarthur

Math+ Protocol and no ventilators reduces CFR

As I stated previously and received critical feedback for lack of evidence on the treatment protocol with Vit C etc, th...
54 comments posted 6yrs
posted by tony.sunnysky
54 comments posted 6yrs posted by tony.sunnysky