When the balance returns in the opposite direction, the first pair of magnets induce a negative current in the coil which closes the transistor, cutting the power from the battery. The key to the circuit is the transistor which acts as a switch.Īs the first pair of magnets on the balance wheel pass over the induction coils and a positive current is induced in the coil connected to the base of the transistor. You can see the magnets on the lower disc in the picture above, the upper disc has two identical magnets on the underside.Īlthough it looks like a single induction coil it is actually two coils wound together, one is connected to the base contact of the transistor and the second to the emitter. On each disc are two magnets which are used to convert the electric charge from the induction coil into electromagnetic energy. The obvious advantage is that being battery powered they never need to be wound, but also the power from the battery remains constant unlike the torque from a mainspring which varies depending on the state of wind. They were first introduced between the true electric watches of the 1950s, such as the Hamilton 500, and the earliest quartz watches which appeared on the market in 1967. The word Electronic on the dial is a clue that there is something different going on here, and opening the caseback reveals an electronic or transistorised calibre, the ESA cal. Niezwyka okazja - zapraszam do licytacji od 1z Pasek nie jest przedmiotem sprzeday. Przepikna niebieska tarcza, oryginalna, sygnowana koronka, oryginalne szkieko z nielicznymi drobnymi ryskami.
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