[clug] More info, please - was Re: Tridge's coffee contraption - photos

Paul Mackerras paulus at samba.org
Mon Nov 30 23:04:42 MST 2009

Alastair D'Silva writes:

> You can achieve the zero cross detection with an
> optocoupler and a resistor divider network.

I would be interested to see a circuit that can reliably detect the
zero-crossings (to within a few microseconds), doesn't need any
high-power resistors, and only uses a few components.


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