You will require a transformer rated for a minimum of 5A at all-around 5V or a lot less. It could be doable to simply include a couple of turns to an current transformer, Because the voltage needed is below 1V.
If almost nothing else, this process purchases some serious assurance. A person in particular was the next on my record.
There are plenty of methods to determine the amount of turns necessary to run a clock motor at another voltage from the first structure price. The strategy explained down below is good, but could be a tad complex if taken to extremes (as I did in The outline).
There is a little complication, in which the Hammond employs the stray AC magnetic area to function the alarm buzzer, but this should not impact the ultimate end result.
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On top of that, employing a one:one isolation transformer will often still entail employing a traditional mains plug over the clock direct, and there is nothing to stop some other person plugging the clock instantly into a normal mains outlet. There are not a lot of plugs and sockets accessible that are rated for (or are ideal) for mains connections, plus the standard plug for your locality is the only real one that is equally readily available and safe to implement.
Of individual problem will be the mains input connector, which is visible in Figure fourteen. This connector wouldn't go any fashionable exam, and with very good explanation. If the connector is partly withdrawn, the Reside pins to the back again with the clock are very easily accessible to small fingers or possibly a piece of metallic (like a paper clip).
The Image beneath shows the rear with the again plate. The assorted levers and shaft holes for that alarm and hand location thumbwheels are visible.
Really should some other person be unaware of your existence or need for that isolation transformer, any safety benefit is quickly lost. Ought to the clock modify arms two or three situations, it is sort of assured the transformer will not be utilized at some get more info point - It will probably be missing or discarded as 'not needed'.
It is really now Completely ready for reassembly and further exams. The magnetic circuit is very crude, and when compared to a much earlier Warren Telechron motor that I have, this a single was built at any given time when Price tag was essential.
For the reason that coil size and motor development is sort of the exact same as the art deco Smith clock revealed over, I by now realize that I can in shape about seven hundred turns in to the out there winding Area. The overall efficiency might be practically just like the earlier example.
In nearly all the illustrations offered listed here, the electric motion can possibly be restored to primary or created to seem practically just like the initial, with the sole change remaining that it now runs from the lower voltage and it is considerably safer than it ever was prior to.
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For this reason, if a number of clocks are connected to precisely the same transformer and one particular develops a fault, a lethal problem can still be designed. For these explanations, I dislike the concept of applying mains isolation transformers except beneath incredibly specific situations.