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This circuit is appalling!! For some reason the output voltage is tied to the incoming LIVE, so touching any of the +5V will give you a shock. The circuit should be "turned upside down" so the +5V is referred to neutral so it is non lethal if touched.
Also in the description the writer gives the wrong reason for the inclusion of R2 (1M), its to discharge C1, -nothing to do with filtering.
Frank
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