>=20 > Anyway, is this going to be a problem of any sort? Other than the > minor annoyance? (I have very sensitive hearing) I don't believe it is a problem - apart from being a problem for your heari= ng. There are several factors, but the main one is you are young, and can proba= bly hear well into the 20kHz range - which is probably where the SPMS on th= e PCB is operating to derive the low voltages required for the FPGA, as man= y of these chips require a core supply down around 1.5V to get the innards = of the chip to operate at required speed. --=20 Scanned by iCritical. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .