Connect with us

a circuit equivalent to function generator

Discussion in 'General Electronics Discussion' started by farrokh, Nov 30, 2015.

Scroll to continue with content
  1. farrokh

    farrokh

    9
    0
    Oct 28, 2015
    i want to send a AC current with 20kHz frequncy to a coil. I know that It is possible by a function generator. Because function generator is expensise, i want to do by another thing. how can i do it in inexpensive way?

    Thanks a lot
    Farrokh
     
  2. BobK

    BobK

    7,682
    1,686
    Jan 5, 2010
    Oscillator + audio amplifier.

    Bob
     
  3. farrokh

    farrokh

    9
    0
    Oct 28, 2015
    Thank you for your reply,
    I want to use it in metal detector. so it should be light and portable. therefore i think oscillator can't be used, any suggestion?
     
  4. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    There are many ways of making an oscillator. The simplest I have made uses a CMOS 4093, one resistor and one capacitor. You could also use a blocking oscillator (one transistor and an inductance), a bistable (two transistors) or Wein bridge oscillator (one op-amp).

    I am not up to the latest in metal detectors but the early ones used the search coil in an oscillator which varied in frequency and compared this with a fixed frequency oscillator to give a whistle.
     
  5. BobK

    BobK

    7,682
    1,686
    Jan 5, 2010
    Or a Colpitts oscillator, which has a single transistor, inductor and a few capacitors and resistors.

    Bob
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-