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If you are a light sleeper and don’t need much to wake you up in the morning then this DIY Gentle Wake Up Alarm Clock by Michiel Spithoven might be the ticket for you. On the other hand if you can sleep through a thunderstorm then you may want to look into a real loud alarm clock instead. “First I wrote some test code to check of a small microchip with internal crystal can manage to keep track of time. Well.., uuuuh.., the result was I lost three minutes a hour, not great.
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February 21st, 2010
And did he give a toght of where the real alarm clock gets the 1Hz signal? There are no crystals on it.Its being divided off the mains 50/60Hz frequency! Aperantly the 50/60Hz is very accurate and so most alarm clock use it as a clock source.
February 21st, 2010
Berni, you are right, this clock gets his signal from the mains 50Hz (in this case) frequency.
But you have to admit that it is a nice weekend project.., or not?!
February 21st, 2010
That it is for sure, just saying he could have replaced that whole clock pcb with a resistor to the supply transfer.
February 22nd, 2010
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February 22nd, 2010
That 10″ or 12″ woofer doesn’t look “gentle wakeup” to me…
February 22nd, 2010
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