A litany of dumbassery

[BoneMusic]

Couldn’t have done it without the Gin

[twinturbo]

The input is not working on my Multi Midi Filter Module… Worked when I removed the Schmitt and bridged the connections… Maybe this has something to do with it?? ( may cure the HUMM too )

[ChristianBloch]

Classic ………………………………….

[analogoutput]

Sorry, but I need someone to explain this one to me. I don’t see the problem.

[Sonosus]

Yeah, I don’t see it either.

[sebastian]

Not sure, but I think the 74LS14 needs 5V, not 12V.

[twinturbo]

Glad AO can’t spot it yes 5V Logic does not seem to like a 12V supply rail. Data sheet says 7V max…

[analogoutput]

Ah… well, I don’t do much with logic chips. What I’ve done has been 4000 series…

[twinturbo]

it works fine now that i have replaced the IC and fudged its power over to the 7805.

[ehisforadam]

Oh boy, got the polarity backwards on a chip again. Not sure I killed it as far as I can tell, but I did swap it out and put it in quarantine. Did pop a power filter cap though! That scared the shit outa me.

[Caustic]

- YouTube

[devicex]

bang , clean it up good that stuff is mildly corrosive .

[twinturbo]

I think there are a few of us with the exploded cap T-Shirt …

Rob

[ehisforadam]

The inevitable happened…my janky PSU ate another power module, this time it was the 5V! Time to just build an MFOS wall wart supply. Fortunately I already have all the parts.

[analogoutput]

I think you’ve conclusively proved that design is to be avoided. Could I request you post replies to the following two posts to warn people of your experience?

Decent, inexpensive bench power supply?

A third option is to connect two 12v power supply together so that they provide the required voltages. I didn’t test it but it seems to work fine. Here is a build : Note that the important part is the schematic on how to connect the two supplies together. I think it should work with other 12v sources. (you could for example connect 2 bench supplies together to make the required voltages)

Power supplies choices?

Just about to start building some modules but I want to get my power supply done first I was wondering if this tutorial would would work? I’m having a bit of trouble finding a good AC / AC Adaptor to work with the Frequencies Central Power bus (which seems to be the standard), so I thought this might be a good alternative

[ehisforadam]

That is a great idea. Especially considering that way of making a power supply is one of the first results when you google DIY eurorack power supplies.

[Caustic]

MICROBUUUUSSSS

FREQUENCY CENTRAL Microbus (Power Supply) [BOM]

Hey everyone, This is to detail what you need to build the Microbus. The build doc’s BOM is nearly identical to what i will provide, and @lookmumnocomputer has a wonderful build video that covers the process. There is also a builders livestream as well. The video shows the smaller version, but its basically the same thing, only a bit more to do. Sam’s Video: Builder Livestream: https://www.patreon.com/posts/fc-power-diy-27556693 Here is the build doc from the frequency central website: …

[ehisforadam]

I actually already built a strip board MFOS supply with
5V rail added , but I was short two caps…

a

[analogoutput]

Me: OK, self, we want this pot to work in the opposite direction

so turn it around when we redraw the schematic, OK?

Self: OK, no problem!

[eric]

In team programming it can even get worse…

One day I got tired of the way things were displayed in “reverse” in a list, so I decided first thing the next morning I’ll change the display function to draw them in the “right” order (and all associated event handling functions).
Next morning, I pulled the latest code, and fixed the display order. Something simple, just loop thru the array from back to front. But… it didn’t work !
After two hours of head scratching, I finally noticed someone else also got tired of this, and fixed it by reversing the order of the elements in the array…