Audio input for Spectrum Analyzer

Discussion in 'The Projects Forum' started by dyeraaron, Dec 16, 2008.

  1. dyeraaron

    Thread Starter Active Member

    Oct 27, 2008
    57
    0
    So, I've had the idea of building a spectrum analyzer for a final project ofr school, but in all my brainstorming and viewing recent schematics they have an audio input.....Ok where does this come from...what supplies the actual audio connection?
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Choose your source - Ipod, tuner, CD player, audio output from a DVD player, audio output from a TV, any line out from an integrated amplifier, audio oscillator, PA system - just for starters.
     
  3. studiot

    AAC Fanatic!

    Nov 9, 2007
    5,005
    513
    You can build a 'noise generator', which is ideal for providing a broadband test signal.

    Just amplify the noise output from a zener diode with a high gain ope amp.

    This produces pseuso white noise

    This can be tailored to the standard audio test signal, pink noise, with an rc network.
     
    Last edited: Dec 16, 2008
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
  5. dyeraaron

    Thread Starter Active Member

    Oct 27, 2008
    57
    0
    Thanks for the info guys...I planned on using my Ipod, but what type of connection jack / plug do I need..the audio input on my schematic is just a circle with a hole in it....I 'm like Ok..????
     
  6. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    For the standard audio connector like the 3.5 mm plug out to headphones, the tip is one channel, the ring is the other, and the barrel is common. That audio input you describe might be a BNC, but it's unlikely.

    Can you post up the schematic?
     
Loading...