# What's the most complicated circuit you know?

by fbs7
Tags: circuit, complicated
P: 390
 Quote by f95toli Some circuits have "regions" in their parameter space where they are chaotic and very useful (unless you want to for example generate noise), but might exhibit predictable (using numerical methods) behaviour elsewhere. Certain types of parametric amplifiers would presumably be an example, especially bifurcation amplifiers.
Yeah! But, does not the nonlinearity of the amplifier belong to the nonlinearity of a single device?
P: 7
 Quote by fbs7 That's a fair point, but what's the function of a circuit that is chaotic and can't be modeled or predicted? Besides generating a chaotic and unpredictable signal, that is?
Encryption.

Pass a signal through a chaotic circuit and as long as the inverse chaotic behavior can by synthesized (like the key) the original signal can be recovered. Research has found chaotic circuits with inverses.
 P: 560 The regenerative receiver? That's an amazingly subtle circuit. And just think, Armstrong did it as a hobby and without benefit of an oscilloscope!
 P: 560 As an exercise to the student, generate and solve the equations for the following device (details on page 10) :-)' Mike http://www.analog.com/static/importe...eets/AD736.pdf
P: 390
 Quote by Mike_In_Plano The regenerative receiver? That's an amazingly subtle circuit. And just think, Armstrong did it as a hobby and without benefit of an oscilloscope!
The more I hear about E. H. Armstrong, he earns my respect. Probably the most excellent radio engineer of his time. Yet he had to commit suicide from the legal tussle with RCA.

http://www.techlib.com/electronics/regen.html
P: 390
 Quote by Mike_In_Plano As an exercise to the student, generate and solve the equations for the following device (details on page 10) :-)' Mike http://www.analog.com/static/importe...eets/AD736.pdf
I accept your challenge Mike, but give me one whole day. Just to be sure I make no mistake. hahaha
PF Gold
P: 3,648
 Quote by Kholdstare The more I hear about E. H. Armstrong, he earns my respect. Probably the most excellent radio engineer of his time. Yet he had to commit suicide from the legal tussle with RCA. Here's one regenerative receiver: http://www.techlib.com/electronics/regen.html
keep eyes peeled in junkshops. sometimes you run across one of Armstrong's old console radios with FM band down around 40mhz.

RCA got FCC to lay television band right on top of him wiping him out.
interesting, not too unlike the GPS- LTE cellphone haggle going on today.
P: 834
 Quote by jim hardy i might have physical one laying amongst my junk, and i have two books on them newer book is 1954 by Willaim A Geyger, "Magnetic Amplifier Circuits" older has sumberged amid the chaos.... it was around 1940 to my considerable surprise they are making a comeback as feedback elements in switching power supplies ! to me they were the best for ultra-reliable critical low frequency applications like our emergency diesel voltage regulators. ( never trust a computer with anything important ) they still defy precise mathematical analysis because of the nonlinearity of magnetics. here's a nostalgic writeup.. http://www.themeasuringsystemofthego...amplifiers.pdf
That's pretty cool, I had no idea they exist. Is this similar to how the core of AC motors sometimes have "core windings" on them to control the amount of flux into the motor windings, and therefore the speed of the motor?
 P: 639 The main clock recovery and sync circuit on this device. http://www.jproc.ca/crypto/kwr37.html The circuit diagrams are still classified secret. Everything was custom hand-made with special boards or cards to generate special test signals to trace bad boards or modules. Former Navy crypto tech 1970s.
Thanks
PF Gold
P: 12,135
 Quote by fbs7 By that I mean a circuit that can't be broken into separate blocks that... err... do something by themselves. . . . . . . For that I nominate the cubic-function generator by Cipriani and Takeshian from Conexant: Link to patent Anything else can beat that?
I might suggest the Internet?
P: 390
 Quote by sophiecentaur I might suggest the Internet?
Does not function as a single irreducible block.
 Sci Advisor PF Gold P: 3,648 ""I might suggest the Internet?"" wait'll it becomes sentient. we'll need a whole new field of psychology.
Thanks
PF Gold
P: 12,135
 Quote by Kholdstare Does not function as a single irreducible block.
When you say it's not irreducible, could you not just say it is built with a high level of redundancy and fault tolerance? Could it not be looked upon as an entity?

 Quote by jim hardy ""I might suggest the Internet?"" wait'll it becomes sentient. we'll need a whole new field of psychology.
Isn't is 'sentient" already (with the help of all its acolites)?
 Sci Advisor PF Gold P: 3,648 Isn't is 'sentient" already (with the help of all its acolites)? now that you ask, it does seem so. Milton's Beezlebub ?
P: 390
 Quote by Mike_In_Plano As an exercise to the student, generate and solve the equations for the following device (details on page 10) :-)' Mike http://www.analog.com/static/importe...eets/AD736.pdf
Here's the solution Mike. I was late as I was not finding time to update it from rough to fair.
Attached Files
 hul.pdf (163.7 KB, 14 views)

 Related Discussions Advanced Physics Homework 2 Introductory Physics Homework 12 Introductory Physics Homework 4 Introductory Physics Homework 1 Introductory Physics Homework 30