3 ms·
Proper design doesn't cover: "Oh look, I can also monitor the 24v battery level if I stick a little voltage divider onto this extra pin" followed by soldering t
by jws 18y ago
Proper design doesn't cover: "Oh look, I can also monitor the 24v battery level if I stick a little voltage divider onto this extra pin" followed by soldering the pin to the wrong end of the high resistor 30 seconds later and powering up.
Frequently these breadboard type computers get accidental shorts from large fingers or are attached to incompletely specified devices ripped from old equipment. That's the only pin I've ruined in many projects and lots of breadboard work, but it happens. It's nice to know I can just move to the next extra pin and continue.
- HeyLaughingBoy 18y ago[Shrug] At risk of sounding like a curmudgeon: learn to be careful, this isn't software. With experience some things become second nature: no loose conductors on the test bench; double check before powering up; test one change at a time; add a temporary BIG resistor to any input that's over the PS voltage, don't change connections with power applied, etc. Ask me how I know that EPROM based devices release a pretty purple flash right before the smoke comes out :-)