Yes the transformers are just that. as I say its simply operating a solenoid
and has switches to stop it or springs to make it go both ways. The reason
a ding or a dong is not working is usually switch, spring or dirt related.
Brian

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The Sofa of Brian Gaff...

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"ARW" wrote in message
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On 13/07/2019 16:43, Muddymike wrote:
We have an ancient Freidland door chime which Dongs but no longer
Dings:-) Ive been looking for a replacement but cant work out if I need
an AC or DC bell unit to continue using the current 12v Freidland 764
transformer.

So far Google hasn't been very helpful, do any of you know if this thing
is DC or AC?

Its DC when you use batteries and AC when you use a transformer. ie most
door bells work with both.

https://www.friedland.co.uk/en-GB/Ch...ages/D117.aspx

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Adam