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  1. P

    Imhof quartz: Battery ideas for 1.35 volt replacement

    Voltage drop of a diode is dependent on the current flowing (according an e-function). If you have the nearly zero current of your tester only, you will get too low figures. You should test voltage drop with a current similar to that of the driven quartz motor. Frank
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    Imhof quartz: Battery ideas for 1.35 volt replacement

    Congratulation :-). However with this adapter and the tiny 357 you lost a lot of capacity / running time. I suspect, this pricey adapter contains nothing more than the schottky diode (<$0.05) that David mentioned above. Frank
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    ATO clock repair

    If I remember well, the gold contacts can be removed from its carrier, turned around and mounted again. I did this many years ago. Frank
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    Electric Clocks Sparks and Arcs

    Amazing! I am out and wish good luck :-) Frank
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    Electric Clocks Sparks and Arcs

    Voltage goes down to 0.7V, current will stay and slowly decay until stored energy in the coil is zero. Just basics. You are free to agree or disagree to an advice :-) Frank
  6. P

    Electric Clocks Sparks and Arcs

    It was already discussed here many times, and this is the essential part in your link: One of several reasons, why a diode protection is not the best solution in clocks. Frank
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    Electric Clocks Sparks and Arcs

    Much better than the "diode" method and slightly better (but more expensive and harder to find) than the "resistor" method! Resistor: mounted parallel to the coil, value 10x coil resistance. Frank
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    Quiet Relay?

    The majority of SSRs will switch AC and is controlled by DC (e.g. 3 - 32 V DC). Frank
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    Slave Clock Wiring

    EW, you don't supply the 19V to your timer board, do you? Your schematic says 12 V and the 555 is rated at max. 18 V. A 555 timer is not precise enough to control a clock, unless you want to adjust daily... Frank
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    Standard Electric Time with mercurial pendulum adjustment problem

    Reminds me of "sawn off three times and still too short" :) Frank
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    ATO ATO clocks

    Yes. It has a long pipe. Frank
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    Bulle Post Your Bulle-Clocks Here

    Hello Carl, what beat rate did you find in the end? Frank
  13. P

    Junghans ATO Electronic

    No. with the values you posted, current will be even less with 3 V. A certain swing amplitude needs a certain amount of electric energy. You can expect longer battery life with 2 pc (3V) than with 1 pc. cell. Frank
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    1960s Urgos Electromechanical Clock Not Functioning

    The contact, a wire, is visible here: You should test the coil here: It will have several 100 ... 2000 Ohms if ok. The diode is for contact protection against back EMF, the clock will run without diode, too. Tim already mentioned that. Also test, if there is electrical link between...
  15. P

    Eureka My first Eureka

    So you will be busy in the near future :) Good luck and enjoy your clock! Frank
  16. P

    Eureka My first Eureka

    Hi Peter, imho reasons for no resistor/no spark protection are: 1. low current clocks get not much harm without one. It is not really needed, but with will be better. 2. Manufacturers had no knowledge of electric issues (e.g. Eureka) I beg to differ. It applies especially to Eureka type clocks...
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    Junghans ATO Electronic

    Not at all. Seems you used a thinner wire. Frank
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    Eureka My first Eureka

    Hello Peter, the lengthy article in your link tells it all, also points to the disadvantage of diode use. Ato, Bulle, Brillie have low currents flowing (about 1 mA) and have coreless coils. They store low energy only. Nevertheless I saw >100 Volts back EMF on my Brillie. Eureka current is 70...
  19. P

    Eureka My first Eureka

    Very good spark protection, contact erosion protection and overvoltage protection is achieved by a resistor 220 … 330 ohms instead of a diode parallel to the coil. This was already known at Eureka inventing times - but not to ist makers :( Jim, if you prefer to stick to old technology, I wonder...
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    Bulle Post Your Bulle-Clocks Here

    A Clockette has 10080 bph. Frank

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