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Stereo Audio IO Landing Pad for Olimex SAM7-H256: Assembled
CNC milled dual channel audio input/output board for the Olimex SAM7-h256 and SAM7-H64 header boards. Input is through an AC-coupled preamp with a single-pole bandpass input with attenuation into a rail to rail opamp in voltage follower configuration. -3db response was simulated at 2Hz-30KHz. A though port is provided to use the device an an audio monitor. Output is a pair of SAM7 PWM through a 4-pole active low-pass filter. Configuration is butterworth salen-key at 10KHz. High end audio hurts. The LED VU display is unbuffered, running at about 2.4 mA, about half a mA beyond spec for 4 of those pins. Headers are provided for asynchronous RS232 comm and external 3.3V supply. Currently it gets power from the USB.
Posted by rmrubin 
February 2008