f3x Posted March 5, 2006 Report Share Posted March 5, 2006 Hi ... I have exatcly two guess to make on that topic1st (less likely ) is the quality of the microphone2nd ... you have inversed R6 and C4 or C3 and R5 (or R7)making it a highpass filter that cut at 100hz instead of a lowpass filter that keep 0-100hzPls make sure your capacitor are at the rigth place.I can also see you are using one led instead of two or a dual ... coud this have any impact ?--------to audioguru:finally about the input voltage, i have realised that two 9V battery is quite big for the "portable" project we are trying to make. So my guess is that i'll be ok with my current pieces and draining +- 4.5 V from a 9V battery. at the worst cases the 9V will get to 6V wich is +- 3V wich is still acceptable. Quote Link to comment Share on other sites More sharing options...
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