Low(er) Frequency Mixer

Discussion in 'Electronics Resources' started by aws505, May 6, 2013.

  1. aws505

    Thread Starter Member

    Mar 11, 2013
    59
    7
    Hey All,

    I'm looking to receive an AM signal at, say, 100 kHz. I want to mix the received signal with a local oscillator to extract the AM signal. If this were a MHz-level carrier, I would just pick up a mixer, but I'm less sure of myself at these low of frequencies. I've looked into some parts, and what I find are mostly called "Multipliers," for example the AD633. Are these "multipliers," the mixers that I'm used to? Perhaps there is a better part for this task?

    Thanks for your input!
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,022
    3,236
    Yes a mixer is a multiplier and a multiplier is a mixer. The AD633 should do what you want.

    But mixing the 100kHz signal with a local oscillator will just give the sum and difference frequencies of those two, not necessarily the AM modulation. Or are you going to mix it with a 100kHz signal from the oscillator to extract the baseband modulation.
     
    aws505 likes this.
  3. aws505

    Thread Starter Member

    Mar 11, 2013
    59
    7
    Excellent; Thanks.

    Yes. The plan here is to extract the baseband modulation. After the mixer would come a lo-pass filter and then a buffer. The signal is AM modulated with a square wave at ~1Hz. I plan to use this baseband modulation to drive an LED and a buzzer.

    Thanks again!
     
  4. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
    aws505 likes this.
  5. aws505

    Thread Starter Member

    Mar 11, 2013
    59
    7
    Wow. I'm glad I posted before building. I definitely don't even need a mixer, just some filters and a simple AM demodulator (ie: a diode). Sorry for bugging, but thank you for the replies. I'm sure this will come in handy some day!
     
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