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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Posted by Phillip Torrone |
Oct 24, 2006 10:29 AM
DIY Projects, Electronics |
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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.
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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.
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