berkeman's latest activity

The relations between the three root ##(r_1, r_2, r_3)## and the quantities ##R## and ##Q## are given in the paper by C. Darwin...

That model also has a very useful feature to report if your heartbeat is irregular (which can often indicate atrial fibrillation...

Yes, sorry for the typo. I will edit the "1" into my post. That company name does sound familiar.

It is not uncommon for the discomfort of an inflated cuff to increase BP. I experience this myself and I've seen it in a number of my...

The problem is not creating a 5W 275kHz sinusoidal waveform with low harmonic content to drive a charging coil. The problem is...

Agreed. I was just using the 3rd harmonic because it is usually the biggest depending on the signal generation circuit, and was an...

As is the 2nd, 4th, and 5th. Typically the 3rd and 5th are higher in amplitude than the even harmonics. I believe I have this right...

Woo-wee! That is one call that would have been pretty challenging for me. Serious props and kudos to the FFs who climbed that crazy...

Sure but, to avoid confusion, I would have to ask all left-handed students to leave the room while doing that. I think the best bet is...

Over what distance? Can the charging coil be placed in direct external contact with the battery case? Or better yet, can it be...

This intro thread is closed temporarily for Moderation. It looks like the side discussion about Erdos should be spun off as its own...

Looks like they all get together to do their business in one go. A designated area!

Welcome to PF. How are you physically going to place the charging coil and the target device? How close will they be? Also, keep in...