I have a slave clock which requires a pulse every second of alternating polarity. I also have an unfinished project using several dividers which is giving me a +ve going 1 second pulse but I have stalled at the output stage.
Now I have gone off at a tangent after stripping down one of those mechanisms that form the basis for nearly all cheap quartz clocks and found, at its heart, a pcb that is outputting such a pulse from a pcb only about 1 cm square ! (pic attached)
The pulse is 12ms and ± 0.6v with dc at half the AA battery voltage. The clock needs ± 4v at 220ma to step the motor. I don't think I could use a bipolar output stage (barely enough volts and not enough current) or a fet because not enough voltage. I can only think op amps. I can design a circuit working from a ± 5v supply which does one polarity pulse (+) but not how to get a neg pulse from the other op amp from the same input.
The question is, is the op amp solution the way the go or is there a better way. Any thoughts appreciated..
Now I have gone off at a tangent after stripping down one of those mechanisms that form the basis for nearly all cheap quartz clocks and found, at its heart, a pcb that is outputting such a pulse from a pcb only about 1 cm square ! (pic attached)
The pulse is 12ms and ± 0.6v with dc at half the AA battery voltage. The clock needs ± 4v at 220ma to step the motor. I don't think I could use a bipolar output stage (barely enough volts and not enough current) or a fet because not enough voltage. I can only think op amps. I can design a circuit working from a ± 5v supply which does one polarity pulse (+) but not how to get a neg pulse from the other op amp from the same input.
The question is, is the op amp solution the way the go or is there a better way. Any thoughts appreciated..
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