On Saturday, 27 October 2018 17:40:52 UTC+1, wrote:
On Saturday, 27 October 2018 16:43:46 UTC+1, PaulS wrote:
My next thought was that it might be something to do with the way the bell
mechanisms work - making and breaking the circuit and that being out of
sync in such a way as to prevent either bell from working - so I modified
the circuit and added a 12VAC relay.

With the relay, where is the additional bell getting its current from?

Trembler bells wired in series will *not* work.

The 'standard' way to run trembler bells in series is to short the interrupter contacts on the second bell(s). Thus both bells respond to the make-and-break generated by the first bell's interrupter.

https://link.springer.com/chapter/10...349-02087-4_12

You may need to add a snubber across the first bell's interrupter as it'll be handling a larger than intended inductive load.

I prefer Friedland or Gent bells to Byron.

Owain

Hi Owain,

I'm using the original 8 vac transformer to drive the second bell - at least I would if I'd got as far a getting the first bell and relay in series to work.

Thanks for the reference - I'll try shorting the trembler circuit. On the subject of the snubber - any recommendations re a value here?

On Monday, 29 October 2018 14:39:22 UTC, PaulS wrote:
On Saturday, 27 October 2018 17:40:52 UTC+1, wrote:
On Saturday, 27 October 2018 16:43:46 UTC+1, PaulS wrote:
My next thought was that it might be something to do with the way the bell
mechanisms work - making and breaking the circuit and that being out of
sync in such a way as to prevent either bell from working - so I modified
the circuit and added a 12VAC relay.

With the relay, where is the additional bell getting its current from?

Trembler bells wired in series will *not* work.

The 'standard' way to run trembler bells in series is to short the interrupter contacts on the second bell(s). Thus both bells respond to the make-and-break generated by the first bell's interrupter.

https://link.springer.com/chapter/10...349-02087-4_12

You may need to add a snubber across the first bell's interrupter as it'll be handling a larger than intended inductive load.

I prefer Friedland or Gent bells to Byron.

Owain

Hi Owain,

I'm using the original 8 vac transformer to drive the second bell - at least I would if I'd got as far a getting the first bell and relay in series to work.

I don't know if you mean the relay coil in series with bell 1 - if so you'd need to rewind the relay coil with much thicker wire for that to work.

Thanks for the reference - I'll try shorting the trembler circuit. On the subject of the snubber - any recommendations re a value here?

no need. Your existing system proves that

Anyway, you've already had explained the standard solution.


NT