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PROS? High Voltage VS Low Voltage Amp
PROS? High Voltage VS Low Voltage Amp
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Old 16th September 2017, 09:38 PM   #91
mchambin is offline mchambin  France
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A bunch of resistors can make a routing calculator.
Believe it or not, I have seen this used in a transmission network. They were modeling the network with an image resistor network. Resistor values as weights of link capacities. When applying a voltage at two nodes, the currents in the net, instantly was giving the best route.
As you can see resistors are not only clever feed back devices ( a joke ) but ultra fast calculators ( hard to believe but true ) .
Isn't mind boggling ?
Kirshof and ohm laws solving at the speed of light a bunch of simultaneous equations as large as you wish...
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Last edited by mchambin; 16th September 2017 at 09:42 PM.
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Old 16th September 2017, 10:01 PM   #92
traderbam is offline traderbam  Europe
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That's interesting. Real time routing decisions. Did they have to keep things especially compact or was it fast enough anyway?
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Last edited by traderbam; 16th September 2017 at 10:04 PM.
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Old 16th September 2017, 10:37 PM   #93
traderbam is offline traderbam  Europe
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Quote:
Originally Posted by mchambin View Post
This was a joke.
I know. But if you believed that an emitter follower was equivalent to a few resistors in parallel then your next statement would make it no joke
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It is clear to me that an emitter follower is a negative feedback circuit exactly as a buffer using an op-amp wired in the non inverting mode at Av=+1.
...
Quote:
Consider a CFP. Here you do see the 100% feed back loop and the two transistors actually make a one transistor emitter follower
Sure. There is a loop and excess gain. The % may vary.
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Old 16th September 2017, 11:05 PM   #94
mchambin is offline mchambin  France
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What I have learned working on looped systems is you cannot inside the loop think in terms of causes and effects as you would on a open loop system.
On a open loop system you can start from the input to say, this causes this effect and progress further this way to the output.
On a looped system you cannot start from some point in the loop and progress around it, imagining causes and effects. This can give a right conclusion as well as a wrong one. Actually it gives invalidated results. There is no well identified causes that give effects in a loop, all is intricated by simultaneous relationships that are instantly solved in the loop.
Intuition is misleading on looped systems, I only trust right modeling and right equation solving.
Intuition can give good ideas and brillant explanations, but is nothing if not backed by physics mathematics and system theory.
This is my 2 cents.
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Old 16th September 2017, 11:13 PM   #95
scottjoplin is offline scottjoplin  Wales
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