bugfight

yes you need the resisters but they do need to be lower in value because the darlington has a fairly high voltage drop, so you only have somewhere near ~3.5 V instead of 5v (iirc). it may well be that if your leds are not efficient enough you will need better leds or source supplies for each source pin as well (udnxxxx whatever it was). each pin of the 595 can easily supply 25mA or so for a high power led, but the total power with all 8 on at once is too high for the power rating of the 595. i planned on ~12mA max per pin. if you have the datasheet for your leds, you can calc r as: R = (5 - Vuln - Vled) / Iled where: Iled is target current in Ampere Vled is the voltage drop of the led at Iled Vuln is the voltage drop of the ulnxxxx (this needs to be adjusted a bit if the timing characteristics of the leds cause them to dim when pulsed) i made some guestimates to arrive at 150r (since i got my leds surplus), which does seem a bit dim thru the sparkfun buttons.

where are your current limiting resistors?

woohoo! now i can lay down the dope moves, and build my campsite cred.

ahhh that's more like it. now: bigger carbon footprint, orgo or ftumch?

hehe "break down" was more hoping for debate on the young ones, or anarchy, or cliff richard...

lol, watch out or rick will hold his breath...

or we can ban all cars in case there's a cliff

mmmmm dj hero for xbox360...

lol: new "scientist" is "new science" like "new economy"? both built on consensus...

i'm still afraid of global cooling since the 70s, so i'm leaving all my appliances on all the time!

hehe, you should call it "marvin" then you can say "hey, marvin, since you have a brain the size of a planet, could you just send this pot position over there? thanks"

sorry, just catching up... i think a more likely (or just another) reason you need lower R is that the darlingtons have a fairly large voltage drop...

mmmm led pr0n mmmm flax oil...

nope

buncha fargin liberals!

ok, i think we might have had a misunderstanding here. seeing your schematic would help, and you don't need to worry about copyright, but should post it here, not on an external site... but i think i get where you are going: with only single color leds, you could get away with connecting left and right rows both to the same DEFAULT_SRM_DOUT_CATHODES1 pin. i thought you were planning to connect switches and sink transistors to the same pin...

woohoo! i better get that core32 finished...

while this can be done, it will require circuit and/or code changes, and i would avoid it... no this is not true. with sink drivers the pins have to be inverted (using the mask you mentioned) thus the button rows are high while the led rows are low and vis versa...

you might have a ground loop with your computer via the midi device... but this would be a problem regardless of what app is uploaded. it could still be hardware if the serial outs try to draw too much only when an app uses them...

this sounds like hardware problem, maybe your supply is acting up only when you draw more power. try starting with a core and lcd only, with nothing else connected, if that works add one thing, etc

hehe some important details there... a box will help for sure, but you'll want a hole to let the hydrogen out. this only happens while charging so you could charge it and then install it... i'd still use a box though, i've only seen two car batteries explode this way, but that was enough to scare me. since it can happen, it's good to take reasonable precaution... re: thick cables, it seems you'll want those for 220v anyways... i have an led flashlight that throws a beam several blocks, brighter than any of my regular ones... maybe consider getting some of those in bulk and replace the switches with relays or likesuchas...

thems the ones. no need for both. he sells pcbs separately as well as with kits. using both footprints allows user a choice.

yes, exactly as indicated on the c64 optimized diagram

i'm not mad, no worries, it's just unlikely for folks to help if you take a shot at someone... yes as long as you stuff the power supply components on the sid module you will be fine with 9vac remember not to do so on the core, though, since the c64 psu outputs 5vdc regulated already. check this with a multimeter, though, these guys are prone to failure. you should see 5vdc (or very close). also check it under load

i almost didn't post this, because of your earlier comments about help, but in the interest of saving a few sids: the c64 psu puts out 9vac not dc, you will zap your sids if you connect that to them. it would be good if you assume there's a good reason for the recommended circuits, until you know enough to question why...