Created by | |
Created | January 23, 2017 |
Last modified | January 27, 2017 |
Tags | No tags. |
Tactile switch for 1 NiMH battery LED torch
Not provided.
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 Then I superseded my own work with a CMOS design.....See USP 3,609,579 and 3,749,937.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 |
by mikerogerswsm
January 25, 2017 |
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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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