Testing the TK Tar Baby

[TinselKoala]

Hmmm... well, I put the values into the Fastead sim and got different numbers from you. The current is close but the resonant frequency is way off.

Meanwhile I took a break and got outside for a little while this evening. Here's tonight's nearly full Luna.

1/500 sec at ISO200, Canon Xti, Megrez90 apo refractor and Baader Hyperion zoom EP at 20 mm, processed in PixInsightLE and gimp.

[polln8r]

Well, at least I don't have a 'reputation' to worry about... I was an art major! So what is the freq? I used the equation: (square root of 1/LC)/2pi. I probably didn't put enough zeros between my dots and my ones. For that matter, I probably used the wrong equation.

Nice Moonar photo!

polln8r

[TinselKoala]

Well, at least I don't have a 'reputation' to worry about... I was an art major! So what is the freq? I used the equation: (square root of 1/LC)/2pi. I probably didn't put enough zeros between my dots and my ones. For that matter, I probably used the wrong equation.

Nice Moonar photo!

polln8r

Thanks!

The equation for the resonant frequency is
f = 1 / (2pi * (sqrt(L*C))
and I get 159,154.9 Hz, or about 160 kHz, for the freq doing it by hand, and two different sims give me 160 kHz and 0.159 MHz.
So I think your algebraic restatement of the formula got grouped wrong.

The current values I'm seeing are in agreement with your value (since I used the same sim!) of about 370 mA peak, during the first few cycles.

That Falstead sim is pretty neat, if extra simple.

[TinselKoala]

@.99: Are you still around?

Do you think that putting a couple of big fat Schottky diodes right at the battery terminals would change the overall circuit behaviour?

[poynt99]

I'm still checking in, yep.

In what configuration are you thinking of TK? Series I suspect?

Yes, I think this would pretty much kill the oscillation during what used to be the oscillation phase.