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Created January 23, 2017
Last modified January 27, 2017
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Summary

Tactile switch for 1 NiMH battery LED torch


Description

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Comments

Interesting to see you are doing low voltage work. Reminds me of my early days designing wristwatches, had to do a 1MHz Xtal osc, phase lock down to 1kHz LC osc, then CR dividers to drive 1Hz motor, all from a 1.4V mercury cell. I was allowed 7uA total current drain. Then I superseded my own work with a CMOS design.....See USP 3,609,579 and 3,749,937.

by mikerogerswsm
January 24, 2017

Amazing! Thanks! Is it US patent number?

by febb
January 24, 2017

https://www.google.com/patents/US3609579

https://www.google.com/patents/US3749937

by mikerogerswsm
January 25, 2017

Wow! Nice! So precise crystal oscillator is tuning low frequency LC oscillator and locking it? Very smart!

by febb
January 26, 2017

Thanks! Lotta math there. H transforms. Ralph and Terry went on a course. I just did the leccy bits. The LC tuned circuit is held momentarily by appling a current equal to that in L, delaying it until the next Xtal osc cycle. I ended up using double the current to get it within a half cycle.

by mikerogerswsm
January 26, 2017

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