Music follower?

Discussion in 'General Electronics Chat' started by Sonoma_Dog, Oct 14, 2008.

  1. Sonoma_Dog

    Thread Starter Active Member

    Jul 24, 2008
    I am looking for a circuit that can amplifier from a microphone signal to a 0 to 5 volt signal, It would be nice to just be able to amplifier the low frequency sounds (bass) and ignore the high frequency.

    Is there such circuit that is well designed for this application? If so, what kind of circuit is it calls?

    What I have in my mind is to use a high voltage gain Op-amp with a Low pass filter in the input. Use a full-wave rectifier and a bypass capacitor at the output to smooth out the signal.

    Any comments will help. Thanks in advance

  2. SgtWookie


    Jul 17, 2007
    What kind of microphone? Electret, dynamic, does the mic require phantom power?

    There are lots of different types of microphones out there.

    The low-pass filter is no big deal.

    I have no idea why you'd want to rectify the output, though - unless you just wanted some kind of VU meter output?
  3. Sonoma_Dog

    Thread Starter Active Member

    Jul 24, 2008
    I want to convert a microphone signal (the microphone that doesn't required power, like the one people use for their computer) to a readable value for the micro-controller A/D port.

    for example, I would like to light up LEDs with the bass beat.