joe2005

I was thinking of a PLC (power line communication) application, I wanted to start with the coupling circuit. Basically it is a HPF that will pass the higher frequency but block the 50Hz and its harmonics. The two designs that I have tried are:

1) C in series then L in parallel then another C in series
2) similar but with another 2 capacitors in the second line. Something like
C-C
-L-
C-C

I switched to the 2nd design after I got electricuted. I put C=4.7nF and L=1uH. Doing the math, a 50Hz voltage at either ends wouldn't reach the other end. The problem is that when I put the 220V~ to one end and connected a low impedence load to the other end a high current passed. (the lights dimmed)
This is my first practical attempt to build a filter, so I appreciate any advice.

Thank you

Nigel Goodwin

As you unfortunately know so little about what you're doing I STRONGLY suggest you don't play with such potentially dangerous projects.

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Hero999

Lol, what was the capacitor rated to, 250VDC?

Did it explode?

You don't seem to know what you're doing.

If you what to make a mains powered circuit, use a transformer!

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audioguru

He got electrocuted but he is still alive. A miracle.
Maybe he fell dead on the wires and the second zap revived him. Another miracle.

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