I then slipped the medium size flat screwdriver in the gap I just cut and twisted it to split the case open (be gentle). I used the Dremmel tool with a slim cutting disk (second photo) and cut through the plastic weld on all 4 corners. This transformer plastic casing is welded shut, so I decided to chop it open. Stating the obvious: MAKE SURE THE TRANSFORMER IS NOT PLUGGED IN This needs to be done with care, to avoid damaging the internal bits you will use. Thin cable ties (I used 3, worth having some more just in case)įor the transformer to fit in the chime case, I had to get rid of the plug-in plastic box it came in.A soldering iron - ALTERNATIVE: more small wire connectors.A dremmel tool with a small cutting disk - ALTERNATIVE: you could also use a stanley knife(harder work).Screwdrivers (one medium flat one, one small flat one, and one phillips).Insulating heat-shrink tubing or insulating tape.I only used 3, as I soldered together some of the wire joints (more compact than connectors) Some small wire connectors (see photos) - the ones I got came on a strip of 12.Some bits of blue and brown mains wire (I only used one brown and one blue bit about 15 cm long.In case the posting is gone when you read this, the ebay seller was tssukcom, their ebay shop is called EZ Security Solutions ( link) and the posting title was 16V AC Transformer UK 3 Pin Plug (Nest/Friedland Compatible) After looking for a while, I found a generic plugin one on ebay that seemed to fit the requirements (see second photo) and was posted as compatible with Freedland chimes and Nest Hello ( link). I bought mine on Amazon, that had the lowest price I could find.Īs Maplin is no longer around (big loss), the obvious choice was to search online for a 240V AC to 16V AC transformer. Funny enough, the inside of the chime looks identical to the one shown on the official Nest Hello installation video, so probably a good choice. It has a modern, minimal and simple design, that would suit most homes, and the cover is flat, so maximises inside space. This can be powered by an external transformer with outputs between 8V and 16V, or by 4 "C" size batteries (so loads of free space in the case to fit a transformer). The only compatible chimes I could find in the UK are from the Friedland range by Honeywell, as they work in the 8V-16V AC range.įrom the Friedland range that work with upto 16V~ power input, I chose the Freedland D117 Ding Dong chime by Honeywell (see photo). First thing to find was a wired door chime that works within the same voltage range as the Nest Hello and has enough space in the casing to fit the transformer and the Nest connector.
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