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The standard Synchronome type (as Bob Miles book) doesn’t have a relay ‘between' the master and the board. I use an emitter follower (removable without trace) to limit the master contact current to the usual 300-350 mA with my 6 channel Synchronome board.
Gents boards I have seen work in a ‘conventional’ really form with the relay coils (one for each circuit) in series driven by the master, and each relay contact set acting as the ’switch’ in independent circuits.
Yes, I think that they are all much of a muchness and differ only
in the circuitry employed. This example has a medium size relay
as the interface between master and distribution outputs plus some
spark suppression components.
On 22/03/2021 09:34, John Hubert wrote:
That looks very similar to the Synchronome type.
Good morning all,
Following your request I attach an image of
a six circuit Gillet and Johnston distribution system
for your information. The jack plug stored at the top
of the unit can be removed and inserted in any of the
other circuits to display that circuit current on the
meter and the rheost adjusted to give the required
current in that circuit. To advance a particular
circuit the toggle switch is moved from normal to
advance and the push button next to the meter
depressed as required to bring the circuit to time.
On 22/03/2021 06:52, Simon
With GPO clocks, you have a GMT relay set
so that you can power several clock circuits in
With Synchronome, you have a distribution
board, which does the same thing. It just allows
expansion so that a really huge enterprise can run
hundreds of clocks. From memory, County Hall in
London was fitted out by Gillet & Johnston and
had 1200 clocks running in it.
I would have loved to see the distribution
system used there!
Simon GPO Clocks