Do u think that it could be C5? Cuz doesn't that make it so that the the signal doesn't degenerate? Or something along those lines. What is RX and TX? I know I know this, but I forgot. Thx. Also, would putting the .1 uf cap across the leads of the battery make it not work? Cuz as I said, it's not in the circuit. I saw it on a different circuit similar to this 1 that uses 3 volts. I'm supposed to put a .001 uf cap across the battery, but I heard that it doesn't realy matter, .1uf will do.