> This is something I had never considered - lifted neutral on a 3 phase supply 
> to a property which (like mine) has 3 single phase distribution boards (one 
> on each phase) feeding different parts of the house (makes power cuts on 
> individual phases interesting). Will bear that in mind. Could be nasty as one 
> dist board has mainly water heating and other low ohmic loads on it (and a 
> solar PV system for added complexity).

We lost a phase at a place I used to live once, so I turned on a couple of 
electric stove burners to bridge some power from the live phase to the dead 
one, so I could run the lights on the dead phase (at reduced voltage, but 
enough to see by).

> Would that AC bypass cap on the input not skew the input signal / add phase 
> shift depending on long sequences of 1s or 0s? What is its hidden purpose?

It’s basically a feed-forward capacitor, giving extra current to turn the 
transistor on and off faster when the level changes.  The rest of the time 
(your long
sequences of 0s and 1s) it’s effectively out of circuit, and the base resistor 
provides enough drive to keep the transistor at its current state.

- John

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