250A - 500A "analog" pulser, rev a2.3

Another way to get a lot of current is to use a transformer.

That's rated 190 amps, but it's good for a lot more at low duty cycle. I think it's from an old AM station, filaments. I paid $15 for it at a surplus place in San Carlos, back when there were surplus places.

I've added an updated writeup on version a2.3

You could mount bike handles to each side and probably get a great upper-body workout huffing that piece up and down.

I have a young engineer who works out. He does my heavy lifting.

Like my 11802 scope. Damned thing must weigh 70 pounds. Miguel muscles that one for me.

Is that still a valuable instrument in 2020? its sampling memory must be tiny.

It's fabulous. The 20 GHz TDR is wonderful, and I have a 50 GHz sampling head. And a dual-channel probe sampler: 3 GHz, 0.25 pF at the probe tips.

The memory is whatever's on the screen.

OK, I learned that although Word won't accept .eps files, showing it as blank, you can convert them to .eml files, and thereby retain vector resolution in your final .pdf file. Good to know.

So I've replaced the writeup with a new copy having an embedded readable expandable schematic. Same link.

I lucked into a cheap Tek 7904 with the 7S12 (S-53 & S-6) TDR plugin. It's supposed to be about 25/30ps. Not as good as the 11802 at