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Author Topic: Can Resonant-circuits be self-powering, and not use capacitors  (Read 2292 times)

Offline postingsite

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Can Resonant-circuits be self-powering, and not use capacitors
« on: February 25, 2018, 11:52:11 PM »
   Can resonant circuits be self-powering, and not use capacitors

   Check :
    https://en.wikipedia.org/wiki/LC_circuit

    (  I'm also refering to the other circuits on that wikipedia-page,   RL circuit,  RC circuit,  RLC circuit  )

    There's no power-source mentioned on that webpage,  and yet for all other types of circuits on wikipedia,   they always mention the power source  .
     -  Although,  yes,  I assume that this circuit receives power from other circuits,  via inductance, via it's coil,     however,    look at the first diagram  :
    https://en.wikipedia.org/wiki/File:LC_parallel_simple.svg

    There's no load on that circuit, just a coil and a capacitor,  self-powering ............
_____

   Do Resonant-circuits,  have to use capacitors

    It seems they do not actually need a capacitor, there's probably more than one way to not use a capacitor,  the method below is interesting,     find the text,   "no capacitor",  on the  webpage below  :
     https://www.electro-tech-online.com/threads/crystal-radio-only-gets-a-far-away-station.124197/

    The diagram on that webpage,  is only visible by using the link below :
    https://www.google.es/search?q=site:.electro-tech-online.com/threads/crystal-radio-only-gets-a-far-away-station.124197/&rlz=1C1AOHY_enES712ES712&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiE6-6ajMLZAhUGaxQKHTrcDqQQ_AUICigB&biw=1024&bih=485#imgrc=oYaXqQRDHFAvPM:

   

Offline sm0ky2

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Re: Can Resonant-circuits be self-powering, and not use capacitors
« Reply #1 on: February 26, 2018, 12:17:06 AM »
A crystal receiver, whether tuned to a terrestrial radio station,
or an astronomical source, draws power from an external signal.
This serves the same function as a battery.
And therefore is not “self powered”


The power comes from somewhere, either a star emitting radio frequencies
or a radio station powered from the electrical grid.

Offline postingsite

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Re: Can Resonant-circuits be self-powering, and not use capacitors
« Reply #2 on: February 26, 2018, 12:36:25 AM »
I've edited the first post,   so that the crystal-radios web-link,  is clearly only part of the question regarding capacitors

Offline sm0ky2

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Re: Can Resonant-circuits be self-powering, and not use capacitors
« Reply #3 on: February 26, 2018, 12:47:36 AM »
LRC’s (or even the theoretical purely LC) have system losses
They are neither self-powered nor self-sustaining