UPDATE: I just finished laying out the 4-channel morphing scanner design with auto-scaled CV range on a single PCB which is 4" x 6.4". It's pretty elegant. I'm making one for somebody already. If anybody else wants one, please let me know.

But I get it - at the end of the day to keep prices rock bottom - that takes abusive cheap labor. Hopefully there will be a day when that is no longer the case. Actually, rock-bottom prices require efficient manufacturing and economies of scale. Keeping costs low doesn't necessarily mean abusing or...

UPDATE: I wrote the little code for the resistors, and now I can use the PDN90RC function to calculate all the RC time constants for the phase displacement network, set the capacitor values, and then use my new E96RES function to find the nearest lower value of resistance from the E96 series. By sub...

for your next trick, make it generate an optimised (fewest different parts) BOM using only E12 values :sb: Actually, all kidding aside, I'm doing exactly that, but with E96 values. It won't be an "optimized" BOM, though -- I'll have to specify the C values I want to use, and then it will automatica...

What does that mean for Frequency Shifter owners of light year's past? Nothing. I used a thing on the internet called QuadNet to design the optimal PDN for my previous design, and my new code gives exactly the same values. The issue was that a) QuadNet is a pain, and b) it wouldn't allow me to desi...

I'm listening to the Steven Wilson remixes of classic Yes albums. Here is the first track from the oldest album he remixed: Yours is No Disgrace, from The Yes Album. I'm sorry, but this is absolutely sumptuous. Listen to this carefully with headphones. If you don't like this, you're dead inside. htt...

Tonight, after much searching around, I finally did something I've been wanting to do for quite a while, ever since I've been building frequency shifters. I figured out exactly how to arrive at the optimal design of a 90-degree phase displacement network, and I put the solution into an Excel spreads...

Name suggestion: PAPILLON

HAPPY NEW YEAR, MOFOS!!!!!!! Here's hoping that 2021 is just a bit less of a clusterfuck than 2020 was (although my personal 2020 wasn't too bad at all, actually -- at least, once I got out of the hospital in March -- because I've felt totally fine for the last nine months, and I managed to get quit...

Tonight, I made the 1U-wide 5U panel for the 4-Channel scanner I stuffed yesterday. The slot for the fader turned out quite nice, and everything fit perfectly the first time. Also, the module worked perfectly the first time -- no layout errors, no solder bridges, no mistakes. That was a welcome chan...

I just finished stuffing the 4" x 4.6" version of the layout above. I am about to test it. Hope it works.

I hate all the synths.

Merry Christmas everyone! (actually, it's Boxing Day, but whatevs) So, a couple of days ago, I realized that there was a small design error in my 4- or 8-channel "noiseless scanner" design. It was a very minor error where I failed to buffer the voltage coming from a rectifying circuit properly, so t...

I don't plan to build another one of those fuckin' things for quite a while. Sell it to us, Dave. :hihi: For the record, they are a tad good. :party: I wanna sell a 5U one -- they are so pretty, and soooo much easier to build (plus I can build the whole thing rather than just the guts). 15_Finished...

I got the QFG in the mail today, so I'm pretty relieved about that. The testing and troubleshooting only took one evening, and a pretty short evening at that, which was a bit of a pleasant surprise. A couple of solder bridges, one inverted diode, and a few resistor value changes to dim some over-bri...

Voltcontrol wrote: ↑

Thu Dec 17, 2020 12:46 am

strettara wrote: ↑

Thu Dec 17, 2020 12:08 am

Dr. E&S is The Perfesser, not the baboon.

Ah, the one who designed the Rubicon amongst other things iirc. Makes sense.

That's as may be, but I'm "actually" a professor. That's my actual job.

strettara wrote: ↑

Wed Dec 16, 2020 10:46 am

If he argues with the Professor now, he’s got the full set.

The Professor is no longer participating in this thread. He has found that it leads to unexpected banishment.

My new favorite song:



(We're a perfect match -- never believe anything else.)

I haven't listened to too much of it yet, but I'm going to be focused on this thing from my all-time favorite band that I discovered the other day: Yes Progeny: Seven Shows from Seventy-Two -- It's seven complete Yes concerts from the 1972 Close to the Edge tour of Canada and the US -- I believe tha...

Stop the world: I wanna get off. So, I'm so busy with schoolwork right now and I've fallen far behind on my builds for people. I finally got a stuffed and tested Frequency Shifter on a 6" x 8" PCB out to a customer in Iceland today, and I think I'll be able to finish the second Serge-format Quad Fun...

seen those home made manual pick & place machines?, two drawer runners, a usb endoscope and a suction tool made from an aquarium pump, like this: https://www.instructables.com/Manual-Pick-and-Place-Machine-for-SMD-Components/ That's brilliant, and way beyond my capabilities or interest. It reminds ...

As we say in the Euro world; "If you can't go wide, go deep!". Or something along those lines. :D Yes, that's more or less exactly the situation with homebrew eurorack. I don't do SMD work, so this is what I have to do. In any case, other than the crazy troubleshooting, this module was a pleasure t...

So, here's the finished product: the eurorack-format Doc Sketchy Interpolating Scanner (which I called "SCAN" because that's all I could fit on this tiny-ass euro panel). EuroScan1.jpeg EuroScan2.jpeg It's admittedly a tad deep, but the client said that was OK. And yes, I know, my knob is too big (a...

Well, I'm only back in this thread because one of my friends has been banned so I wanted to see what all the kerfuffle was about. It wasn't about much, evidently. People are being banned from this forum for things that would barely have raised a supercilious smirk years ago. Oh well, times change, t...

He was in Bill and Steve and Chris and Rick's excellent adventure. Here's a couple graphics of the interpolating scanner circuits. These just generate the control trapezoids for four channels -- they need to be plugged into a quad linear VCA to make a complete scanner. A unique feature of these is t...