Dear All, Can anyone suggest for me, how / where i can find the resource to make the filter for USB data line?, I'm make circuit for USB data acquisition in a system mixed with large current consuming instrument, Like when compressor (8.9 Ampere 220VAC) ON or OFF, my USB DAQ system is stuck. I'm using PIC18F4550 to develop USB Data acquisition board. Thanks, iddhien. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist