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1 Hz Clock Generator Circuit Document
Lab Note: The COBs used in different watches may differ somewhat in their configuration. But by trial-anderror one can always find out the appropriate points corresponding to points A, B, C and D. Figure of a second COB used by EFY Lab is shown alongside. The points A and B (on the COB used by us) were observed to have complementary 1Hz outputs and hence anyone (only) could be used as input to opamp CA3140.