SparkFun Electronics will be closed on July 3rd, 2015 in observance of Independence Day. Any orders placed after 2:00pm MT on July 2nd will be shipped out after the weekend. Thanks!


Member Since: January 13, 2009

Country: United States



i like to twiddle bits.

Programming Languages

C, Obj-C, Perl, and English


Purdue University


Test Equipment (Oscilloscopes)



  • When using this module, I am seeing a (1.5Vpp) pulse every 13.6ms (73.5Hz). This pulse appears to only occurs if there isn’t enough sound going into the mic. Could this be some kind of oscillation from the op amp? With this periodic pulse, I am having a difficulty determining when there is actual sound coming in or not.
    Also, if I don’t put the mic right next to the sound source, I get almost no (usable) output…

No public wish lists :(