I luvv it! The STIMULATOR.
I luvv it! The STIMULATOR.
(OP)
I only recently discovered the Linear Technology Spice simulator. It is awsome and at a great price!
Go to http://www.linear.com/mylinear/login.jsp register and then go to http://www.linear.com/designtools/software/#Spice and download the LTspice IV. "A high performance Spice III simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators"
Never again wait forever in circuit simulations where fast edges co-exist with long time constants or while the simulator tries to converge in impossible situations. Never again add resistors parallel to diodes to get a result at all.
I have gained new insights by using this simulator. I had, for instance observed that a home-brew calibrator with very fast edges produced parasitic low amplitude spikes of opposite polarity when switching a transistor off (no, no inductive kick-backs). Never understood why, but LTspice revealed the whole truth.
Switching a transistor off very quickly sometimes means "sucking" too many carriers out of the base region. And that produces a short, but noticeble, negative excursion on the collector. It is so obvious when you see it in the simulator. Changed capacitor parallel to the base resistor and transient gone!
I do not call it a simulator - STIMULATOR is a much better word for it.
Go to http://www.linear.com/mylinear/login.jsp register and then go to http://www.linear.com/designtools/software/#Spice and download the LTspice IV. "A high performance Spice III simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators"
Never again wait forever in circuit simulations where fast edges co-exist with long time constants or while the simulator tries to converge in impossible situations. Never again add resistors parallel to diodes to get a result at all.
I have gained new insights by using this simulator. I had, for instance observed that a home-brew calibrator with very fast edges produced parasitic low amplitude spikes of opposite polarity when switching a transistor off (no, no inductive kick-backs). Never understood why, but LTspice revealed the whole truth.
Switching a transistor off very quickly sometimes means "sucking" too many carriers out of the base region. And that produces a short, but noticeble, negative excursion on the collector. It is so obvious when you see it in the simulator. Changed capacitor parallel to the base resistor and transient gone!
I do not call it a simulator - STIMULATOR is a much better word for it.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...





RE: I luvv it! The STIMULATOR.
I only re-discovered it in the past few months, and am quickly trying to relearn using a Spice program. The schematic interface of the LTSpice is great. When I went to school, I had to punch the spice on IBM cards and submit the cardstack to the high priest of the mainframe.
RE: I luvv it! The STIMULATOR.
I haven't needed a SPICE simulator in 21 yrs, but you guys convinced me to download it.
Have no idea what I'd do with it now, but I have it
TTFN
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RE: I luvv it! The STIMULATOR.
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: I luvv it! The STIMULATOR.
Yes! You are right. The base-cathode diode charge carriers of course behave the same as those in the standard diode. Never too late to learn new things - or view them in a new light. Thanks!
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: I luvv it! The STIMULATOR.
Z
RE: I luvv it! The STIMULATOR.
Keith Cress
kcress - http://www.flaminsystems.com
RE: I luvv it! The STIMULATOR.
I've been using it for a few years now. A couple of times it has come in really handy to prove / disprove a concept that the boss wanted to investigate.
RE: I luvv it! The STIMULATOR.
Keith Cress
kcress - http://www.flaminsystems.com
RE: I luvv it! The STIMULATOR.
Glad to see that you have come around. I guess we could say you are "recovering"
RE: I luvv it! The STIMULATOR.
Keith Cress
kcress - http://www.flaminsystems.com
RE: I luvv it! The STIMULATOR.
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: I luvv it! The STIMULATOR.
Keith Cress
kcress - http://www.flaminsystems.com
RE: I luvv it! The STIMULATOR.
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: I luvv it! The STIMULATOR.
I think it was just the local, 'season's greetings'.
Keith Cress
kcress - http://www.flaminsystems.com
RE: I luvv it! The STIMULATOR.
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: I luvv it! The STIMULATOR.
Keith Cress
kcress - http://www.flaminsystems.com
RE: I luvv it! The STIMULATOR.
RE: I luvv it! The STIMULATOR.
I have looked up temperatures and food poisoning. Amazingly of the approximately 12 non-chemical common food poisonings available for selection by humans at least half include marked temperature rises with onset. Now I know.
I had an epiphany, it actually makes sense since! I have always kept FP and any other common cold/flus in separate categories. In reality they should be looked at as the same thing. They are both organic attacks by foreign organisms on the body. One is just the "low route",(GI tract), and another the "high route",(respiratory system), with, of course, various in betweens and exceptions. Of course, raised temperatures would a possibility!
To a healthy Christmas season for everyone!
Keith Cress
kcress - http://www.flaminsystems.com