On Saturday, 27 October 2018 17:20:45 UTC+1, Max Demian wrote:
On 27/10/2018 16:43, PaulS wrote:
Hi Everyone,

I have a frustrating door bell extension situation.

When the house was rewired many years ago a cable (bog standard 2 core bell wire) was passed through the cavity / under floors from the under-the-stairs transformer adjacent to the breaker panel, to the front door bell push via an over the door bell (https://www.screwfix.com/p/byron-120...ll-brass/14337) providing a simple door bell setup.

Mains
| |
____|__|_____
| | ______
| Transformer |------------------------| |
| | | Bell |
| 8VAC |---------Switch---------|______|
|_____________|

When I built my office I ran a cable from a second bell in the office back to the under-the-stairs panel. From past experience I knew i wouldn't be able to hear the existing bell when working.

Initially I tested each bell individually - both ring when they're the only one on the circuit. I then wired the bells in series. No sound. I hadn't really expected them to as the 8 Volt transformer wouldn't have the oomph to drive 2 bells in series.

I think you would normally have to wire them in parallel for it to work.
Maybe if you shorted out the contact of the second bell it might work in
series.

--
Max Demian

Thanks Max,

I'll give this a go.