I’ve wondered if anyone’s come up with a capacitance multiplier circuit for Mean Well supplies. I haven’t found any.
Don’t they use it for op amp power?
My modules seem to average around 20 mA each on the -12 V rail and about the same on +12 V except when there’s an Arduino involved Current status – Analog Output . 500 mA is 25 times 20 mA, so good for about two dozen modules, but that leaves a lot of the +12 V capacity unused.
Don’t they use it for op amp power?
I can’t say. If they do, I think it’s fairly minimal like you pointed out. The lack of -12 V is the main reason I am using two bricks, though. I also only run 15-20 modules in each Kosmo case. I did my best to stress test one of the cases with more modules than I would be able to fit including some thirsty Eurorack modules and this power supply held up well enough.
You are also correct about the +12 V and even the +5 V remaining somewhat underused.
OH…what kind of connectors are those? What gauge wire did you end up going with?
Those are not WAGO connectors, but look similarish and just as useful…
You are awesome! After a bad breakdown with a relapse, I am currently with my sister to gain some distance and to recover. But now my fingers are really itching and I would like to recreate everything I’ve seen here - RIGHT NOW 
It is absolutely amazing how some of you have evolved over time. I’m happy to be a part of this community and I’ll be showing new modules again soon.
BIG Cheers from Germany! 
Thomas
Welcome back homie! Glad you’re on the mend!
It turns out that I can’t read a schematic properly, nor can I pick the correct component out of the correct bags. I somehow got it into my head that I needed 0.1µF ceramic capacitors, when I actually needed 1µF electrolytic ones. It also helps if you wire those in according the schematic, so they charge and discharge correctly, rather than just dumping everything to ground… 
What an absolute 
…
I should probably find out how to send the output into my laptop, but that’s a job for another day. Hopefully I can find some time tomorrow to rebuilt the oddness filter, we’ll see how it goes.
I also noticed that the body on one of the ceramic capacitors is looking a bit worse for wear. Not sure if this is my doing, or if it came like that. The multimeter says it’s fine… 
Time for a 
!
While looking at the video and listening to the audio I envisioned someone at their first day as an operator of a nuclear reactor and things starting to go wrong when flicking the first switch and every next switch makes more urgent alarms go off until …
The triple oscillator is alive, and tuned.
Messed a couple things but I think I can sort them all out. Need to add three buffers to isolate the summers of each 3340 at the master cv.
Also I used the 12v rail on a voltage divider to get my center note trimmer for each, this is not a good idea. The lfo opamp doing its business was enough to cause audible distortions because the power rail was fluctuating. I switched the trimmers to the 5v regulator instead and it seems to have fixed it.
The modulation inputs aren’t working real well, most of the effect of the mod is in the last 5% of the mod Amt knob. I guess I need to read more about the fm on the 3340
Other than that, sounds super fat!
PS thanks @Jos for updated tuner code. I had to change some code because I wired the 7-segment a bit different but couldn’t have been easier and working good now. I started reading about the auto tuners, pretty cool
@fatboab is right. They are some connectors I found at the local hardware store that are the closest thing I could find to WAGO connectors (the best). I also used 14 gauge wire for the connections from the power socket to the power supply, but 12 might be better.
Hi everybody,
I’m trying to get a -2v reference voltage for my oscillators “LO” mode. This is what I tried:
It doesn’t work. It messes up the divider, which isn’t too surprising now that I look at it. What is the cleanest way to do this? Add a unity gain buffer before the inverter?
That’s what I’d do; you could also make the 5.6ks much larger, like 1M (and for even better precision make the voltage divider resistors 1k), but if you have an op amp spare I think the buffer’s better. You also need only two 10k in your divider, not four.
I need 3 and 1v also. For the octave switches. The plan was to have -2, 0, 1, 2, 3, and 4v
Daddy mod legs is installed, keyboard cv is working! Also the -2v is working!
Just need to figure out the mod mixer now
If your CV node includes a center frequency trimmer putting out more than 2 V, you could also maybe save two op amps by starting with a higher reference voltage, say 10 V, and dividing down to 0, 2, 3, 4, 5, and 6 V, then reduce the center frequency trimmer by 2 V.
Yeah I have 5v center trim. I was thinking about something along those lines but I had a few of those 4v lm4040aiz from the lmnc oscillators leftover. I think that’s a good idea for the next revision. I’ll have to look into something that outputs higher reference
All done and finished (juste found out that the lfo SYNC in isn’t working but mehhhhh).
I am really pleased with the final result but I would not do it again in one big panel. The stress of breaking one while installing another was too much to take…
Once again, many thanks to this forum.
Next is a MIDI to CV module.
The sync is a little iffy when working. If you turn the “dist” all the way one of the ways works a lot better. And have the lfo running a little slower than what u put into the sync
Looks awesome!
aka daddy mod legs
