SparkFun will be closed May 25, 2015 for Memorial Day. Orders placed after 2pm on Friday the 22nd will ship out on Tuesday. Thanks!


Member Since: December 29, 2010

Country: United States



Electronics and software engineer with more than 20 years experience in embedded systems.


Researcher Digital Media Technologies


The Centre For Design Innovation

Spoken Languages


Programming Languages

C#, C, ASM, PIC, ATMEL, Arduino, ChipKit

  • This issue suggests that the op-amp OPA334 is not being driven at high enough gain. I replaced R4 100K (0603 size) the one closest to the AUD output pin, with a 1M 0603 resistor. Now the output level (P2P level) is much higher, ideal for input for Arduino or microcontroller. But not if you are using it to record audio.

No public wish lists :(