I repeatedly tried to post new schematics and circuit board layouts and each attempt would start but ultimately was timed-out by the website and failed so, after trying for a long time, I gave up waiting for the situation to be fixed.
Meantime, I have improved the layout a bit and can confirm that the circuit works just fine up to 28X2 (I don't use 40X2s at all) and I love the auto power off and power on because the circuit is always unpowered except during the period that programming actually is in progress.
The circuit as designed will program a 40X2 as long as the chip can program with power applied to only one pin of two V+ pins. Everything I've read says yes, it will work, but I have not tried it.
Tried again with circuit and pcb, but uploads fail. I got one photo jpg to upload, but smaller jpgs will not complete.
Meantime, I have improved the layout a bit and can confirm that the circuit works just fine up to 28X2 (I don't use 40X2s at all) and I love the auto power off and power on because the circuit is always unpowered except during the period that programming actually is in progress.
The circuit as designed will program a 40X2 as long as the chip can program with power applied to only one pin of two V+ pins. Everything I've read says yes, it will work, but I have not tried it.
Tried again with circuit and pcb, but uploads fail. I got one photo jpg to upload, but smaller jpgs will not complete.
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