Changing the Polarity of a Smiths Pin Clock
#21
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Bill, I don't know when the diode appeared. I have noticed that later clocks often have the polarity written on the face, so those most likely will have a diode. Of course if the clock has had a previous restoration, the face might have lost the label or a non-diode clock might have had one added.
Incidentally, the more recent version of the clocks4classics upgrade is I think polarity insensitive. I don't know what the various upgrades consist of, but, for anyone who wants to cut costs and keeps the pin operating at a much reduced current, it should be fairly easy to design a circuit that uses a transistor (switched by the pin) and a couple of resistors to drive the movement.
Incidentally, the more recent version of the clocks4classics upgrade is I think polarity insensitive. I don't know what the various upgrades consist of, but, for anyone who wants to cut costs and keeps the pin operating at a much reduced current, it should be fairly easy to design a circuit that uses a transistor (switched by the pin) and a couple of resistors to drive the movement.
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Glyn M Ruck (04-03-2023)
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Andrew Fanshawe
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