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Old 10th Jul 2018, 9:46 am   #2
Herald1360
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Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,528
Default Re: Info. on 'phone requested

If there's no sign of any power connector, it must be line powered. A small amount of current can be drawn from the line before an "off hook" condition is tripped. CMOS electronics takes very low current unless it's busy doing something, occasional heavier currents can be had by using a storage capacitor charged via a suitably high resistance.
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