So, here's the basis of the device in terms of hardware. There is a simple filter to add downstream, a TL082 plus a few passives, but really this is it...there's also a few (6, RC0-5) pins available on the micro for other functions...what happened to JP101? I don't know - the hazards of cut and paste...
Steve A.
I've just noticed, JP101 is present, near the top left. I must have written the above before the caffeine had kicked in...
Later...although it is shown in the datasheet, there's something wrong here around D101...datasheets are sometimes wrong!! I have amended the drawing below to show what I think they really mean, but it only applies if you're going to program the devices yourself. So far I'm happy to make my NBTV/SSTV software freely available to those who want it. But those who want a pre-programmed and tested devices, just ask, it's not a big issue. However, this one hasn't even been started yet!! Updates as and when...