proximity sensor + electret microphone = no compatible??

hey guys,

i having trouble when connect , infrared proximity sensor (http://www.sparkfun.com/products/242) , preamplified electret microphone (http://www.sparkfun.com/products/9964).
when connect sensors separately, work perfect, when connect both electret microphone reads signal of 1023 (5v) @ time.

do have voltage different power sources? weird.

thanks,

here leave electret mic sketch read signal if necessary.

code: [select]

const int micpin = a2;   
int valuemic = 0;
int valuemicmax = 512;
int valuemicmin = 512;

void setup() {
  serial.begin(9600);
}

void loop() {
  (int =0; < 100; i++){
    valuemic = analogread(micpin);
    if (valuemic > valuemicmax){
      valuemicmax = valuemic;
    } else {
     if (valuemic < valuemicmin){
      valuemicmin = valuemic;
      }
    } 
  }
  valuemic = valuemicmax-valuemicmin;
  serial.println(valuemic);
  valuemicmax = 512;
  valuemicmin = 512;
}

how wiring them exactly?  code doesn't mention proximity sensor.

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