- for x in range(1, 100000000):
- print("
")
- print("
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I just ran it to see if I could get an error code but I just went into the singleplayer and lo and behold it’s playing nicely now.
Sorted. Now I can play minecraft instead of music!
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650+ items ordered from Tayda. Not one of which is a 10 pin box header. 
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yep did a "good " one even after reading about d42kn355’s miss fortune of plugging the power into the link socket on the 1222 VCO , I managed to do the same on the 1 module out of 3 that hadn’t put tape over the link socket . luckily it was a quick matter of changing the tl074 ic out and taping over the link socket . plugged it in right and it seems to work . well they light up , haven’t checked for sound or tuned yet. moral of the story kids is that is a good idea to plug / cover the link socket when not in use .
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2 mm isn’t that big a mechanical discrepancy, right?
(Good news: found in KiCad, not in hardware. I’d uploaded the Gerbers but not yet pressed “order”.)
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Forgot to let space for the rail — again!! :-/
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Spot the problem:
One more for the checklist 
(but luckily, the PCB could at least be used for testing, after some minor tweaks. And with fewer clamping diodes…)
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Who let the smoke out!?! Poof! Poof!
Who let the smoke out!?! Poof! Poof!
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Unfortunately no smoke, the power supply I used for testing is too polite
Root cause was a weird TL072 schematics footprint in EasyEDA, with VCC− at the top (checked my other EasyEDA PCBs and they’re all fine, so just bad luck/memory and I should use my own footprints…).
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Unfortunately?
(%@#! minimum character count)
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Yay I would have gotten it right if I’d have been brave or timely enough to guess. As far as the circuit goes, Is the circuitry leading to the inverting and non-inverting inputs assuming the reversal?
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@antoine.pasde2 Unfortunately, as in “lack of entertainment value”
@Maxhirez The circuit was fine, it was just the power rails to the TL072 that were backwards. Usually, you want your + to point upwards and your − to point downwards, but that was apparently too easy for whoever added this footprint. And of course I didn’t check that part against the datasheet…
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Ive seen it both ways, i guess its just something to watch out for. Ive looked around for conventions, but i dont think (at least from where ive been looking) that there is a general rule for that. Ive even seen inverting op-amp circuits with the positive on top.
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The problem is power, not inputs. +12V pointing down is just silly. It’s like north and south on a map, you don’t flip the directions around just like that.
But yeah, the point is that you cannot trust the EasyEDA footprints. I had an issue earlier where some genius had decided that the line on a 1N400x represented the anode…
5 Likes
so I ordered an other mini ADSR thinking I needed one , there is a space in my rack where there should be one . well as I was digging around my bench last night a came across the ADSR boards and chip still in the bag , apparently I already had the missing ADSR just hadn’t put it together its been so long sense I had ordered the 10k pots [ 2 months] that I forgot I had it .
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Yeah, you’ll use both.
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yes most defiantly .
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Well my sequencer design has a major design flaw on the original version of the PCB delivered the other day.
I inadvertently chose a digital MUX for the analog inputs, even worse i just used the same one for the Digital outputs, even worse the correct units are not pin compatible…
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Bo xxxxx.
After discovering the above i searched and orderd some 4051’s … like the ones i ordered a month ago!
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The secret of electronics is that everything runs on smoke. If you let the smoke out your circuit will stop working. Keep the smoke from escaping!
4 Likes