The obtained 1 Hz signal is fed to two 74LS90 counters (U11 and U12) that count seconds. This signal is divided further by 2 using a part of 74LS90 counter (U6). The clock uses a 32768 Hz quartz crystal (X1) and 74HC4060 counter/divider IC (U1) to generate 2 Hz signal.
Please refer to the schematic file in the Design Files section below. So I thought, why not to build a nice little clock using these components. And recently when cleaning my parts boxes I found several 74LS47 7-segment decoders, some 74LS90 decade counters, and MAN1A 7-segment displays. I got a bit tired from soldering SMD components, writing firmware, (and also observing people building vintage-looking Nixie clocks using modern microcontrollers).
#Digital clock pcb circuit program on cam350 manuals#
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