As I planned to make my own PCBs including core/ain/din/dout inside, I’m finishing my kicad schematics and I’m a little bit stuck by the part that concerns J1 & J2 and all the power supply stuff at the bottom right on this schematic: http://www.ucapps.de/mbhp/mbhp_core_v3.pdf
if I plan to never use J1 (& and >5v psu) should I remove the rectifier, the uln etc ? should I put them however ?
As I planned to make my own PCBs including core/ain/din/dout inside, I’m finishing my kicad schematics and I’m a little bit stuck by the part that concerns J1 & J2 and all the power supply stuff at the bottom right on this schematic: http://www.ucapps.de/mbhp/mbhp_core_v3.pdf
if I plan to never use J1 (& and >5v psu) should I remove the rectifier, the uln etc ? should I put them however ?
If you now using yours 5V psu with J2 its quite so ,redraw a schem without the power supply stuff at the bottom right on this schematic: http://www.ucapps.de/mbhp/mbhp_core_v3.pdf
i say you can drop them. but you know that situation when you are in a hurry or a bit absent minded. it happens sooo easy, that you plug something wrong. with the conventional setup, you might blow up the regulator, in your case you can say good bye to your cores and what else is a bit sensitive. so if you are sure to do that, i would have psu, that is hard wired (psu inside the case) or at least have a very unique plug, so that nothing else fits.
regarding the plug, i think of other equipment, standing near your midibox (keyboards, synths, whatever). so i meant using a plug, that fits in no other equipment at all (maybe mini-din, sub-d,…). just to clarify my thoughts, as i guess, you already got what i mean
about the fuse: i dont know what kind of fuse you want to use. i dont know whats available there, but an ordinary melting fuse will certainly be too slow. i guess, even a short voltage spike can burn the pic. according to the pic’s datasheet, input voltage is rated at 4,2V up to 5,5V. i didn’t find anything about a lethal voltage though
just out of curiosity: why don’t you want to use the inbuilt power regulation?
that explains, why you want use that psu if this is such a big unit, i would put the psu inside the protodeck, if there is the space. so that you plug the mains-cable directly to the unit.
Regards using fuses to protect core etc: I would suggest you add a diode to each of your boards, so that if you do reverse the connections the fuse will conk out.
