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If the line cord is radiating EMI, you probably can't eliminate it at the output of your circuit with a filter. The EMI can get into the current source and the 555, wreaking havoc with the signal that the 555 generates.Yea... Got a few on some cables for equipment we have around. Might pop one off and try it. If I wanted something packaged with the circuit, would a TPD2F702 be appropriate? The schematic on the datasheet looks pretty straightforward. Do you know if it's possible to assemble this out of components, or is there something that the IC is doing but not showing on the schematic?