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Casing and finished product
02/21/2019 at 16:07 • 3 commentsHere is the finalized product. Better than just standing in the shelf.
And it feels good to know that the module is powered up and playing a role in the clock. -
Board working
02/16/2019 at 13:13 • 1 comment -
Clock Board
02/07/2019 at 12:01 • 0 commentsHere´s the PCB layout of the clock with the interface to the LVDC module:
The parts are mounted behind the 1-inch 7-segment displays.
The circuit is based on the schematic by danyk666, it´s a classical counter circuit which uses counters 4060 and 4026. It doesn´t need BCD to 7-segment decoders, as the ICs do the job already. A quick design here, not the most beautiful routing, but will do the job.
Anyway, it´s a quick build. -
Reverse Engineering
02/07/2019 at 11:52 • 0 commentsWith a multimeter and and some time I was able to find the following structure:
It looks like a gigantic Diode-AND gate. The diodes have a common anode. I couldn´t find any isolated diodes or transistors.
What else could it be? Maybe a clock distribution circuit where the clock is decoupled by diodes? Or was it used for driving core memory? I don´t know.
However, I will stop the reverse engineering here, as it´s already enough in the circuit to be used in the clock. I will use the AND structure to flip the clock from 59 to 00.