Friedland door bell and transformer

SUNRAY · 2026-03-28T00:57:54+0000

Harry Bloomfield said:
Since always. Drawn one way, by the DC polarity, there is no spring, so it doesn't fly back, so you just get a ding. Drawn the other way, by the opposit polarity, it is drawn against a spring, which fires it back when the button is released, and so you get the dual ding-dong.

But this isn't a dual sounder unit.

ericmark · 2026-03-28T01:19:53+0000

It uses 6 volt DC, but a higher voltage AC.

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Friedland door bell and transformer

SUNRAY

ericmark

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