Testing the TK Tar Baby

[picowatt]

I did the measurement in the simulation as well....and it confirms the 200mA area.

.99,

So, mathematical prediction, your simulation, and TK's empirical measurments all seem to be in agreement.

The "odd man out", apparently, is Rosemary.

When I began posting, I was wondering about the neg mean pwr measurement, and how that could be.  I greatly appreciate all the time you have spent performing your simulations and analysis, and the time and money TK has spent collecting empirical data.

I have learned a lot.

I thank-you both for that,

PW

[TinselKoala]

You're quite welcome, and I've learned a lot in turn from the both of you as well. And I've also learned a lot from Ainslie, which applies to my major field of study and expertise. Enough, perhaps, for a publishable article as a case history report.

Meanwhile... back at the ranch.... Tar Baby takes a day off and Willy WaveTek and Hi-way F43 play together alone for a while.

http://www.youtube.com/watch?v=cIcgFfBuMbM

I know, I know... more incomprehensible misdirection, insufficient lighting, and obviously TK is using special garage-sale equipment that isn't like anything anybody around here has ever seen. Why... there aren't even any numbers in boxes !

Therefore aliens.

[picowatt]

You're quite welcome, and I've learned a lot in turn from the both of you as well. And I've also learned a lot from Ainslie, which applies to my major field of study and expertise. Enough, perhaps, for a publishable article as a case history report.

Meanwhile... back at the ranch.... Tar Baby takes a day off and Willy WaveTek and Hi-way F43 play together alone for a while.

http://www.youtube.com/watch?v=cIcgFfBuMbM

I know, I know... more incomprehensible misdirection, insufficient lighting, and obviously TK is using special garage-sale equipment that isn't like anything anybody around here has ever seen. Why... there aren't even any numbers in boxes !

Therefore aliens.

TK,

If I ever see an F43 at a "garage sale", I will definitely snatch it up!

PW

[TinselKoala]

TK,

If I ever see an F43 at a "garage sale", I will definitely snatch it up!

PW

The WaveTek Model III VCO has some good features too. It also will put out nearly 40 volts p-p into a high impedance, and it has a separate 5 ns risetime square wave output and multiple outputs for other waveshapes simultaneously. It also has a fine frequency vernier... which the Interstate doesn't. But the Interstate has the offset adjustment and the WaveTek doesn't....
I also have an Interstate F34 Sweep Function Generator, similar in appearance to the F43 but with the sweep functionality. They seem to be rare.... I can't find manuals or much info about the company, but inside they are bulletproof construction, discrete transistors and TTL chips mostly, on big-trace circuit boards that are easy to figure out and work on.

But of course the same "trick" can be done with any modern function generators... except perhaps the "IsoTech GFG324". For example, say you need a 2 v p-p signal with a - 72 volt DC offset --- that is, you want a signal that varies from -70 volts to -74 volts in a square wave... what do you do? Well, you simply hook your FG in series with a 72 volt battery, and the load you are driving, with the proper polarity. (Respecting the fact that the 50R in the FG is probably only a 2 or 3 Watt resistor, of course, so your load mustn't draw too much current.)

[picowatt]

The WaveTek Model III VCO has some good features too. It also will put out nearly 40 volts p-p into a high impedance, and it has a separate 5 ns risetime square wave output and multiple outputs for other waveshapes simultaneously. It also has a fine frequency vernier... which the Interstate doesn't. But the Interstate has the offset adjustment and the WaveTek doesn't....
I also have an Interstate F34 Sweep Function Generator, similar in appearance to the F43 but with the sweep functionality. They seem to be rare.... I can't find manuals or much info about the company, but inside they are bulletproof construction, discrete transistors and TTL chips mostly, on big-trace circuit boards that are easy to figure out and work on.

But of course the same "trick" can be done with any modern function generators... except perhaps the "IsoTech GFG324". For example, say you need a 2 v p-p signal with a - 72 volt DC offset --- that is, you want a signal that varies from -70 volts to -74 volts in a square wave... what do you do? Well, you simply hook your FG in series with a 72 volt battery, and the load you are driving, with the proper polarity. (Respecting the fact that the 50R in the FG is probably only a 2 or 3 Watt resistor, of course, so your load mustn't draw too much current.)

What??? Draw current thru an FG...?

"Slow boat" just arrived moments ago.  Could have sworn I ordered 20, only got ten.  Looks like that is all I was charged for as well.  10 pieces and shipping for under $25.  Not bad.  I have two left over from an old project from a few years ago (that I finally found).  So that makes 12.  I'll have to compare their Vthresh.

Can anyone say "high votage electrostatic driver"?

PW