bynes Posted January 13, 2007 Report Share Posted January 13, 2007 hi to all,i guess it wasn't that easy at all. building the amplifier circuit was not the main problem. we build it already and found out that the output sound was not that loud and clear. still there are some noise.the amplifier stage is the first out of three. we still need to connect it to ISD2560 to record and can playback the output sound. next to it is to display the counted heartrate sing LCD or 7segment.hope you have time answering my questions...thanks alot and Godbless... Smiley Quote Link to comment Share on other sites More sharing options...
MP Posted January 13, 2007 Report Share Posted January 13, 2007 Post a schematic of what you have put together. Otherwise all posts will be theories and guesses at best.MP Quote Link to comment Share on other sites More sharing options...
audioguru Posted January 13, 2007 Report Share Posted January 13, 2007 Hi Bynes,Please describe the sound. Is it distorted? Goes it have hiss? Does it have background sounds? Does the microphone or its cable make loud crackling noises when they are moved? Did you use the TL072 low noise opamp?Did you use new 9V alkaline batteries?Moderator,Please delete his duplicate thread. Quote Link to comment Share on other sites More sharing options...
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