The latest Citizen Science has a how-to on making a pulse circuit from a clock, the completed circuit provides pulses with a duration of about 30 milliseconds… Allan writes – ” This easy to make circuit will provide pulses at a highly accurate rate of one per second (1 Hz). The circuit is based on a common quartz clock movement that seems to be in most of today’s wall clocks. A suitable movement can be salvaged from a clock or purchased new from a hobby shop. “ – Link.
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4 thoughts on “HOW TO – Crystal controlled 1 pulse per second clock”
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This is a clever circuit! Probably could just have used an NPN bipolar transistor, rather than the lm339 comparator, in common collector mode, by feeding both diodes into a base resistor, to acchieve the ‘OR’ functon.
I was disappointed to find that this project amounts to “build a clock… using a clock!” I would be much more interested in an article explaining the characteristics of the little “tin can” quartz oscillators and how to wire them up.