Hi...
 
My firmware upgradable code lock seems to be ready soon
Now i use PowerPCB to build the circuit. Before that i want to ask something...
 
EMC is pretty nasty phenomena, which usally is forgotten when design e.g. MCU-based appliction. I had some really weird problems caused by EMI.
 
I found this Atmel's AppNote 042, which suggest following aids to decrease EMI. I just have problems of finding proper coil of 47nH. Can i replace it (L1) with 100nH coil? Still i wonder is L1 and C3 somekind of LC-circuit? Thus changin value of L1, may significantly decrease LC-filter efficiency or may reduce transient current too much. Shoul'd C3 value then recalculated? Am i right?