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(Beginner) Spark gap- Transient voltage suppression

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Ant_Magma

Jan 1, 1970
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Hi guys.

I'm currently building a power line modem.

In this picture taken from MAXIM/DALLAS' MAX2980 AFE datasheet
http://geocities.com/Antonio_Magma/sparkgap.JPG

There's this sparkgap just before the powerline at the upper right of
the picture.

I've done some searching and i realise there are many types of voltage
suppresion methods and components, such as transient voltage
suppression diodes, transils, varistos etc.

Which one should i be using? The breakdown voltages should be at 240V
right?

My circuit is to be connected to a 50/60Hz 240V AC power line. I'm
transmitting at 4Mhz-20Mhz

Please advise. Thanks.
 
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