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IMG_3880 | by 74hc595
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IMG_3880

The timekeeping board and card edge adaptor board. It's a standard circuit; ATmega48 microcontroller, DS1307 real-time clock, DS32kHz oscillator (free sample from Maxim), two 74HC595 shift registers (which store the four BCD digits to be displayed), and a Tayloredge 1363 high-voltage power supply.

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Taken on September 22, 2009