And make SURE you fit a load resistor!
RP





A simple homemade CT is a small mains transformer (2-8W) with a piece of
mains rated insulation wire threaded through the window between the coil
and the core, to form a half turn (thread through one window, then out
through the other). Pick a transformer that allows this. Old 'bell'
transformers usually fit this description. The turns ratio is respectable
so even small currents can be measured (lightbulb, dimmer etc). Typically
the turns ratio is at least 200:1 and higher. Pay special attention to not
nicking the mains cable at the sharp edges of the core, and ground the
core if possible.

Peter

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