Rosemary Ainslie circuit demonstration on Saturday March 12th 2011

Rosemary Ainslie · May 16, 2011, 01:05:19 PM

Quote from: poynt99 on May 16, 2011, 12:56:33 PM
You're welcome.

The net average is determined by the sum of the areas of the curve above and below zero. I've painstakingly filled in the POS and NEG areas for you to show this. If you were to cut out these areas from a sheet of paper and weigh them, the red paper would weigh slightly more than the blue paper. This tells us that the net average is slightly positive. See the attached scope shot.
I will try changing the wire inductance to 2.2nH from 200nH, but I don't think it will result in a negative average across the shunt.

Check out this one with your 'paper test'. To me it looks predominantly NEGATIVE. Sorry I wrote positive. I'm definitely aging - at pace.

Sorry Poynty. I've just seen it's 130. I thought it was zero. Ignore this post.

poynt99 · May 16, 2011, 01:20:09 PM

Quote from: Rosemary Ainslie on May 16, 2011, 01:05:19 PM
Check out this one with your 'paper test'. To me it looks predominantly NEGATIVE. Sorry I wrote positive. I'm definitely aging - at pace.

Sorry Poynty. I've just seen it's 130. I thought it was zero. Ignore this post.

Indeed Rose.

And that is already the averaged value, so there is no need to apply the "area test" to it.

.99

Rosemary Ainslie · May 16, 2011, 01:30:30 PM

Good stuff Poynty. Just out of interest. Do an average power delivered. Depending on the value of the resistance you'll apply to the CSR at that frequency. My rule of thumb is R = 0.9 Ohms. But I know you argue it as R - 1.2 Ohms.

Meanwhile Poynty - check your email. You need to get this nailed. Somehow.

Kindest regards,
Rosie

NOT MY NIGHT. MORE ERRORS I HAD TO DELETE. Golly. Sorry guys.

CORRECTED

poynt99 · May 16, 2011, 01:40:55 PM

As I expected, the circuit would not oscillate with only 2.2nH of wire inductance.

Keep in mind that wires exhibit anywhere from 20nH to 60nH of inductance per inch of wire, so it is impossible to have only 2.2nH of added inductance on any of the MOSFET pins.

.99

Time to go climb up Diamondhead volcano.

Rosemary Ainslie · May 16, 2011, 01:44:13 PM

Quote from: poynt99 on May 16, 2011, 01:40:55 PM

Time to go climb up Diamondhead volcano.

lol. That's energy well spent. Have fun.

R