you're
algebra and
whatever, I
Then there'd have been a fireball and black smoke. But nothing could be seen. The stuff must have been flying quite a bit because there were a few seconds between the kaboom and the clanging.
-- Regards, Joerg http://www.analogconsultants.com/
That's why I got the SignalHound USB spectrum analyzer so I can schlepp it in a carry-on bag. Plus the tracking generator, not so much for filters but to be able to gauge the attenuation of undesired noise intrusion paths.
If this IBZ sampling box really does 8GHz and the risetime is well under
100psec it should be at least half as good as the big old Tek. And at $1k. Plus CTRL-PrintScreen gives you an instant snapshot.-- Regards, Joerg http://www.analogconsultants.com/
you're
algebra and
whatever, I
Yep, those KABOOM!, one-thousand-one, one-thousand-two, one-thousand-three, one-thousand-four, one-thousand-five, one-thousand-six, CLANG! can be quite scary. I've experienced a couple of those of my own :-)
Trying to remember now, back in the '60's, we had a whole AZ town disappear when a community propane tank caught fire. TV crews a mile away filming the fire were bowled over by the blast :-( ...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
[...]
Unless the Romans built it, then it does.
-- Regards, Joerg http://www.analogconsultants.com/
I've owned old houses and new houses. The new ones are better.
John
Could've fooled me, an oscillator without feedback.
Tim
-- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
his
and
se
In the UK they have much lower ceilings which makes the room proportions a bit odd.
California is unusual. The earthquake risk means that houses have to be built to a code that got a lot more stringent after 1906.
-- Bill Sloman, Nijmegen
Obviously there's feedback of a sort, but not of a kind where you could fiddle with the phase shifts.
-- Bill Sloman, Nijmegen
and
whatever, I
I tightened the big nuts under there to the point where I'd think any more would break them and this #%^!! plastic junk still leaks. Unusual shapes, tough to buy anywhere, the usual.
So I guess I'll have to try pipe dope now. Great. Just great.
-- Regards, Joerg http://www.analogconsultants.com/
Actually, it didn't. The codes got serious after the Loma Prieta earthquake in 1989. Our house was built in 1992. It has massive concrete foundations, steel beam framing, and has structural plywood shear walls.
John
Just because the loop is closed doesn't mean the differential equations aren't there. You can gain access easily enough by controlling gain or bias (manipulating the voltage or current into the base supply, or varying the feedback voltage through various methods: pot, variac, old school rotating-axis "tickler" coil, etc.).
For instance, a high impedance bias supply could allow the base supply voltage to vary (large resistance or CCS, with servo if required), and the V-I characteristics would then be easily observed (impedance, step response, squegg damper "best values", etc.).
Tim
-- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
testing on
is
no
Last time i was pounding Mathcad i was doing a simulation with it. Got the job done too. I found the user interface to be fine, just very different from everything else i had ever used, well until recently, Macsyma is rather similar.
?-)
They are, but the fact that you get squegging with bipolar transistors and not with MOSFET switches makes it fairly clear that the feedback isn't driving the squegging in any way that would make it sensible to think about manipulating the feedback.
What happens with a too-high feed inductor is that current being fed into the centre-tap overshoots at start-up so that the voltage at the collector/drain of the "off" switch goes below the supply rail (which you can see in the simulations), inverting that switching transistor.
In the simulations that overshoot dies away, and the circuit settles into stable oscillation. In real life - but only with bipolar switches
- it doesn't and it seems more sensible to blame something in the subtleties of the behaviour of the inverted bipolar transistor rather than the differential equations.
-- Bill Sloman, Nijmegen
I haven't tried it since DOS days ;-) ...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
The transistor versions often have a bypass cap in the base bias circuit. The signal swing is rectified by the bases and charges that cap. All that adds another dynamic element to the loop.
Mosfets don't have base current.
John
s
Don't worry. It's not a problem that's easy to understand. Peter Baxandall only mentioned it in a footnote, which meant that he didn't feel that he understood it either.
-- Bill Sloman, Nijmegen
testing on
born
And
is
no
paper
thought
design.
I find the GUI version a lot easier to deal with. I don't have to remember all the "abbreviations" and their usage rules. If i can find my sim and a 'puter to with Mathcad loaded i will make a pdf and send it to you. Unless you ask for it this will be low priority.
?-)
Thanks! At your convenience. It's not a biggy, I can solve transcendental equations with PSpice, just ducky ;-) ...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
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