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SiriusHardware · 26th Oct 2018, 2:40 pm

I did that one myself, around 2012. It's not very repeatable / replicable as there is a complex maze of 20 * optocouplers built on the lower of the two veroboards. The idea of using optocouplers was so that the interface was completely isolated and could be disconnected from the MK14 while it was running, so I could load it up with something and then leave it running a demo in its clean stand-alone configuration.

There are theoretically alternative / easier ways of doing the hex downloader / keypad interface which I'll be happy to discuss in due course.

26th Oct 2018, 2:40 pm	#109
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,569	Re: MK14 schematic revisions I did that one myself, around 2012. It's not very repeatable / replicable as there is a complex maze of 20 * optocouplers built on the lower of the two veroboards. The idea of using optocouplers was so that the interface was completely isolated and could be disconnected from the MK14 while it was running, so I could load it up with something and then leave it running a demo in its clean stand-alone configuration. There are theoretically alternative / easier ways of doing the hex downloader / keypad interface which I'll be happy to discuss in due course.