Frequency amplifier Circuits

Discussion in 'General Electronics Chat' started by king40, Dec 2, 2014.

  1. king40

    Thread Starter Member

    Jul 17, 2013
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    HI Engineers , Friends
    I need some suggest
    what is the best:
    Powerfully frequency amplifier circuit
    for max voltage 18 V ?
    Please Share Some Circuits About This
    Thanks :rolleyes:
     
  2. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    I think there is some confusion with your concept of frequency and amplification.
    Frequency can be multiplied to make a higher frequency (but not "powerfully")
    - in a mixing process with another signal
    - in a frequency doubling type circuit

    A signal can be amplified
    - current gain
    - voltage gain
    - combination of both

    Please tell us what you are trying to do.
     
  3. GopherT

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    Nov 23, 2012
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  4. king40

    Thread Starter Member

    Jul 17, 2013
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    Thanks
    You Right
    "
    A signal can be amplified
    - current gain
    - voltage gain
    - combination of both
    "
    my means exactly both of them
    amplifier Current and Voltage of frequency
     
  5. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    Ok, then you need to use the word, "signal" instead of "frequency"

    Now, we need to know more about the signal you have...
    -What is the shape of the wave form?
    -what is the frequency
    -What are you using to make the wave form (Microcontroller, radio receiver, oscillator from linear or digital ICs, ...)
    -What is the voltage
    -show your circuit if possible

    Now, what voltage and load do you need to drive with your amplified waveform?
    Tell us what you want to do.
     
  6. king40

    Thread Starter Member

    Jul 17, 2013
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    -shape is square
    - make with Microcontroller
    - Output from Microcontroller so voltage is 5v ( must be amplifie)
    - working on circuit
    Voltage is 5v because my Generator is Micro So i want to amplifier signal
    and max voltage is 18V
     
  7. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    So, a simple logic level N-mosfet switch will work.

    SOURCE pin to ground

    DRAIN Pin to your load (39 ohm resistor, for example) to allow 500 mA to go through at 18 volt supply

    Connect your load (39 ohm resistor) to the 18v supply

    Then connect your Microcontroller pin to a 10 ohm resistor and your 10 ohm resistor to the GATE pin on your Mosfet

    Connect a 100k resistor from the GATE pin to ground.
    Finally, make sure to connect the ground wires powering your micro to the ground wire powering your mosfet.

    Make sure you use a "logic level" mosfet. That is, one that turns on completely when the gate voltage is at 5 volts (or even less).
     
    Last edited: Dec 2, 2014
  8. king40

    Thread Starter Member

    Jul 17, 2013
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    Thanks :rolleyes:
    this is Powerfully?
    any n-mosfet can do this?
     
  9. Brevor

    Active Member

    Apr 9, 2011
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  10. king40

    Thread Starter Member

    Jul 17, 2013
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    You Can Give Me a Circuit For Example ?
     
  11. MrChips

    Moderator

    Oct 2, 2009
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    Or a simple NPN BJT will do.
     
  12. wayneh

    Expert

    Sep 9, 2010
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    Follow the words in #7 carefully. He has given you the details you need. Search for "MOSFET switch" for more general information.

    Oh wait, Gopher made a booboo. He meant "gate" where he wrote "drain" in lines 5 and 6.
     
    Last edited: Dec 2, 2014
    GopherT likes this.
  13. WBahn

    Moderator

    Mar 31, 2012
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    What do you mean by "Powerfully"?

    That is like saying that you want a light that is bright and someone gives you a 300W halogen but you had in mind something that could start a piece of paper on fire from ten feet away in under a second. Or, the reverse, someone gives you a light that starts paper on fire in a flash but you just wanted to better illuminate your living room.

    You need to determine what you need, in concrete terms, and then communicate it to us.
     
    kubeek and absf like this.
  14. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    FIXED - I Hope!
     
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