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general questions

Discussion in 'Electronic Basics' started by Sean McIlroy, Nov 6, 2007.

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  1. Sean McIlroy

    Sean McIlroy Guest

    two questions:

    *) where can one read proofs of circuit-theoretic theorems (Thevenin,
    Superposition, etc)?

    *) can an fm receiver be substantially simplified (ie: simplified to
    the point where even a chucklehead like me can eventually comprehend
    it) if the thing is designed to receive only a single station?

    thanks,
    stm

    ps: a paper on my webpage (http://www.geocities.com/sean_mcilroy)
    summarizes what i've been able to puzzle out regarding the ac
    differential equations. my fantasy is that someone will look at it and
    be able to tell me what i'm missing (or where i'm simply out-to-lunch,
    if such is the case)

    peace,
    stm
     
  2. Tom Biasi

    Tom Biasi Guest

    I just typed "thevenin proof" in Google and got pages of good info.

    Not sure without knowing the level of your chuckleheadedness.
     
  3. Bob Masta

    Bob Masta Guest

    I seem to recall some really simple FM receiver circuits using
    tunnel diodes, back in the '60s and '70s. Then tunnel diodes
    vanished from the face of the earth, apparently sucked up by
    alien space ships. I guess they were afraid that if humans
    ever figured out how tunnel diodes really worked, we'd be
    able to challenge their galactic supremacy...

    Best regards,


    Bob Masta

    DAQARTA v3.50
    Data AcQuisition And Real-Time Analysis
    www.daqarta.com
    Scope, Spectrum, Spectrogram, FREE Signal Generator
    Science with your sound card!
     
  4. But that tunnel diode didn't do anything magic. The design that
    comes immediately to mind was the one in the GE semiconductor book,
    where the tunnel diode was a converter stage down to a very low IF,
    where a pulse counting detector sat. Even if the thing you remember
    used the tunnel diode in some other capacity, chances are really good
    that all kind of other devices could be used for the same purpose.

    The previous question seems to be about understanding the circuit,
    not finding a simple circuit to build. Two different things. A block
    diagram is far better for understanding, because then the basics
    can be introduced, without the "clutter" of all those parts or
    the "clutter" of what amounts to minor variations from specific design
    to specific design. Looking at specific designs will only sidetrack
    things, "well why does this one use that tube and that one another tube?"
    when really one needs to see the common points first to interpret
    the rest.

    That GE tunnel diode receiver is no different from the average FM
    broadcast receiver, if you use a simple enough set of block diagrams.
    Understand the conversion process, and why it is done, and then the
    concept of an IF strip, and then a bit about FM demodulation, and
    then that can be applied to that simple GE tunnel diode receiver or
    that fancy stereo receiver. When you understand what is suppoed
    to happen in an FM receiver, then it helps to interpret a specific
    design.

    Michael
     
  5. -----BEGIN PGP SIGNED MESSAGE-----
    Hash: SHA1

    I once read a Phrack article introducing the basics of RF recievers (FM
    and AM), though I can't remember the issue. Check the archives at
    http://www.phrack.org/archives.


    - --
    Brendan Gillatt
    brendan {at} brendangillatt {dot} co {dot} uk
    http://www.brendangillatt.co.uk
    PGP Key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xBACD7433
    -----BEGIN PGP SIGNATURE-----
    Version: GnuPG v1.4.3 (MingW32)

    iD8DBQFHMKY/kA9dCbrNdDMRAh86AJ96VGgdciRg1vQL/FRg34xA698MGwCgxBVt
    JhmlQ9FAeGFEuwIsxmeHbHw=
    =/x2M
    -----END PGP SIGNATURE-----
     
  6. Jamie

    Jamie Guest

    Close!, They didn't want us getting into their cable network and getting
    free Alien Cable shows!
     
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