Cave Art

Cool.

So, what did you blow off its substrate this time?

Mark L. Fergerson

That's the big mosfet that I tested to destruction yesterday. It failed discharging a 10,000 uF cap charged to 50 volts, ballpark 300 amps, 1 millisecond, 10 joules.

I squeezed it in a big vise, sideways, until the case cracked. I think I actually sheared the silicon into two slabs.

Anyway, I thought it looked cool.

Indeed it did. You've got good eyes for that kind of thing.

The bid is a 300 do I hear four four four... Mikek

Sold!!!

I showed it to my wife without telling her what it was ("Ignore the frame and tell me what you see") and even after finding out what is it she still wants me to print it out and hang it in the living room wall!

Mark L. Fergerson

I guees the cavemen actually were testing MOSFETs, copying the damage report onto whatever they had handy, a stone wall :-)

Cheers

Klaus

Well, the newsgroup title was a tiny hint.

Yeah, it looks better than what's hung in most galleries around here.

We do PCB layouts that are occasionally beautiful, too.

How the heck does one "shatter" (do not know correct term here) in a sheet of glass, in selected locations and directions to deliberately create images?

A popular tinkerer actually posted a video about this recently...

...It probably works on silicon, too, but beware the cleavage planes. Seems like sometimes it cleaves, sometimes it flakes randomly.

Tim

Picosecond lasers are used for the micro fracture glass sculpture pieces. The laser is focused to a tight point inside the glass.

Lasers less then 3 nanoseconds will do it, but the fracture is much bigger and difficult to position.

Energy required is a few tens of milliJoules for 1064 nm Pico pulses and about 200-300 mJ for Nano pulses at 1064 nm.

Steve

It's not glass, it's silicon. Power mosfet.

I squeezed it in a vise. That's a good way to crack open a mosfet.

The "image" was an accident. The hole burned in the fet wasn't; I deliberately blew it up to check a point on the SOAR curve.

Those one terminal devices are pretty stable aren't they........

I can't measure Rds-on any more because D and S are, well, somewhere around here now.

--

John Larkin Highland Technology, Inc

jlarkin at highlandtechnology dot com

Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation