Search found 1437 matches

by cygmu
Sun Mar 29, 2020 5:24 am
Forum: Buchla, EMS & Serge
Topic: MARF 248r source code available
Replies: 105
Views: 5387

Re: MARF 248r source code available

I think you are referring to decoupling the VDDA pin, right? The STM32F407 datasheet suggests 1uF / 10nF for this -- Fig 52. C22 on the board is the 1uF in this role; connecting a 10nF in parallel can't hurt. It still won't be very close to the pin of course, unless you do some surgery on the daught...
by cygmu
Fri Mar 27, 2020 12:27 pm
Forum: Music Tech DIY
Topic: 1-a-day project
Replies: 14
Views: 349

Re: 1-a-day project

They look great, Julian -- especially with the shaped holes for the Johnson banana jacks. Very nice.
by cygmu
Fri Mar 27, 2020 3:17 am
Forum: Buchla, EMS & Serge
Topic: MARF 248r source code available
Replies: 105
Views: 5387

Re: MARF 248r source code available

Thanks so much for making this available! I've just built my MARF and flashed the latest version of the firmware down. One thing, though - I can't seem to enter the calibration mode; if I turn on the power holding the left advance switch down, I don't get cycling LEDs. I'm not super familiar with t...
by cygmu
Wed Mar 25, 2020 3:00 pm
Forum: Buchla, EMS & Serge
Topic: Serge/Ian Fritz 4U Panel PSU question
Replies: 1
Views: 76

Re: Serge/Ian Fritz 4U Panel PSU question

The Fritz power connectors will (4 pin Molex or MTA-156 style) are most likely: red +12V, black 0V, white -12V. The Konstant lab supply is probably following the Random Source pinout, or there would have been trouble. That is: pin 1, 12V; pin 2,3: 0V; pin 4: -12V. Honestly I would not hook these up ...
by cygmu
Mon Mar 23, 2020 11:57 am
Forum: Buchla, EMS & Serge
Topic: MARF 248r source code available
Replies: 105
Views: 5387

Re: MARF 248r source code available

I did an experiment where I captured the raw value from one of the sliders over time while the sequence was running.The slider was at the bottom of its travel. The values ranged from 20 to 1110, with most values in the range of 4-8. I think there must be a typo in the above -- is there? Whatever it...
by cygmu
Mon Mar 23, 2020 9:34 am
Forum: Buchla, EMS & Serge
Topic: MARF 248r source code available
Replies: 105
Views: 5387

Re: MARF 248r source code available

Inspired by the progress here (thanks again!) I finally built up my MARF. I think it is working, running stevenb's latest released firmware, though the thing is a bit confusing so I can't be 100% sure... There are some weird issues on mine which seem to relate to grounding -- switches occasionally g...
by cygmu
Thu Mar 19, 2020 2:14 pm
Forum: Music Tech DIY
Topic: Which system/module to start building? (aiming at the bananas)
Replies: 24
Views: 438

Re: Which system/module to start building? (aiming at the bananas)

There are obviously lots of choices available but if you are attracted to Serge then you could start by making a small system akin to the STS Serge Creature: - DUSG: available as CGS114, https://sdiy.info/wiki/CGS_Serge_dual_universal_slope_generator - SSG: available as CGS92, https://sdiy.info/wiki...
by cygmu
Tue Mar 17, 2020 1:19 am
Forum: Music Tech DIY
Topic: DIY Mutable Unsuccessful Builds
Replies: 3076
Views: 165661

Re: DIY Mutable Unsuccessful Builds

Hey guys, i was measuring resistors on my Veils build and noticed that all 16 of the 510 ohm resistors were actually 51 ohm. This was due to the packaging saying 51Ohm instead of 51-Ohm :doh: . I replaced them and my module still doesn't work properly :\. Anyone know what this could've caused? I re...
by cygmu
Sun Mar 15, 2020 3:39 pm
Forum: Music Tech DIY
Topic: Having difficulty fixing my Veils
Replies: 2
Views: 71

Re: Having difficulty fixing my Veils

Just checking: when you test do you have R1 and R40 installed? Without those it will behave very badly, maximum gain from any kind of non zero CV.

Those are for channels 1 and 3. For the other two, R28 and R69.

Edit: actually that might not be what happens. But it won’t be good.
by cygmu
Sun Mar 15, 2020 3:06 pm
Forum: Music Tech DIY
Topic: The 2020 Show Us Your DIY Builds Thread!
Replies: 113
Views: 9955

Re: The 2020 Show Us Your DIY Builds Thread!

Don't really post my DIY anywhere, but I'm proud of this project so thought I would share. Built about a month ago, but I didn't have time to really calibrate them fully with work scheduling. Finally got the time over the weekend and WOW! Superb. I really must build a few more of the Slightly Nasty...
by cygmu
Sun Mar 15, 2020 1:20 am
Forum: Music Tech DIY
Topic: Haible VariSlope Filter, parts values on Pcb?
Replies: 22
Views: 321

Re: Haible VariSlope Filter, parts values on Pcb?

This is very strange.I also thought there was only one version of the Varislope PCB, but the original PCB has values printed on it, not reference designators. So obviously there is another version. I wonder where it came from. Can you post a picture?
by cygmu
Fri Mar 13, 2020 8:45 am
Forum: Music Tech DIY
Topic: Unstable DIY R*S Serge NTO
Replies: 3
Views: 112

Re: Unstable DIY R*S Serge NTO

Thanks for the advice. I'll dig out my multimeter and go over it thoroughly tomorrow. It might be tricky to see much on a meter as opposed to a scope but you should use what you have of course! If the meter has an AC voltage mode, that would let you see how much a given voltage is varying, which is...
by cygmu
Fri Mar 13, 2020 8:42 am
Forum: Music Tech DIY
Topic: Barton quad vca/mixer
Replies: 8
Views: 178

Re: Barton quad vca/mixer

Yes, check your resistor values. In particular the 10 Ohm resistors. You wouldn't be the first person to put 10k there.
by cygmu
Fri Mar 13, 2020 3:57 am
Forum: Music Tech DIY
Topic: Unstable DIY R*S Serge NTO
Replies: 3
Views: 112

Re: Unstable DIY R*S Serge NTO

I once had an oscillator whose frequency suddenly went wobbly. The issue in my case was a potentiometer that had somehow gone bad. I think it was the main frequency pot. Replacing it fixed the issue immediately. Diagnosing might be difficult but if you have a scope and can probe the lugs of the pots...
by cygmu
Wed Mar 11, 2020 3:16 pm
Forum: Music Tech DIY
Topic: please delete
Replies: 20
Views: 767

Re: google claims ownership of intellectual property

You quoted term 8.1 which is about Google's IP. Para 8.4 reads: 8.4 Google acknowledges and agrees that it obtains no right, title or interest from you (or your licensors) under these Terms in or to any Content that you submit, post, transmit or display on or through the Services, including any inte...
by cygmu
Wed Mar 11, 2020 3:07 pm
Forum: Buchla, EMS & Serge
Topic: First Serge module
Replies: 30
Views: 1152

Re: First Serge module

The DUSG is the quintessential Serge module of course, but I think if you already have Maths and are not moving to a banana setup you wouldn't feel like you'd entered a brave new world. The Smooth and Stepped Generator is along similar lines but different enough and benefits from a good bit of patch...
by cygmu
Tue Mar 10, 2020 1:25 am
Forum: Buchla, EMS & Serge
Topic: Bucha 275r - noise culprit found?
Replies: 17
Views: 387

Re: Bucha 275r - noise culprit found?

still raises the same question - under what circumstances would you ever want to? understand that eventually they tie back together, but my understanding was the goal was to do this as close to the power supply as possible. why would you want to do it on a module? Here is an excerpt from the schema...
by cygmu
Mon Mar 09, 2020 9:21 am
Forum: Music Tech DIY
Topic: DIY Mutable Unsuccessful Builds
Replies: 3076
Views: 165661

Re: DIY Mutable Unsuccessful Builds

True (and you can see silkscreen under the ics) - but it’s also worth pointing out that this isnt an original veils board - it looks like 0603, the parts are in different places and the ground plane is different..... Good spot! Noticing the parts size is one thing but oh my, the ground plane!?!? On...
by cygmu
Mon Mar 09, 2020 7:00 am
Forum: Music Tech DIY
Topic: DIY Mutable Unsuccessful Builds
Replies: 3076
Views: 165661

Re: DIY Mutable Unsuccessful Builds

I successfully flipped one of two of the chips but the second one removed a pad. The chip i successfully flipped just has one channel working sadly.. im actually shocked there's no polarity pointer on the pcb for such an expensive chip. This is awful. Thank you for your help It's ridiculous that pe...
by cygmu
Sun Mar 08, 2020 3:47 pm
Forum: Music Tech DIY
Topic: Connectors soldered - not crimped
Replies: 14
Views: 519

Re: Connectors soldered - not crimped

MTA-100 connectors are neither soldered nor crimped: they are insulation displacement connectors, so you shove the wire in to the connector without even stripping it. You can do this with a screwdriver or you can buy the (overpriced but effective) hand tool. Mouser part numbers: tool: 571-598031 3-w...
by cygmu
Wed Mar 04, 2020 5:50 pm
Forum: Music Tech DIY
Topic: TSNM how to load/save
Replies: 7
Views: 286

Re: TSNM how to load/save

batchas wrote:
Wed Mar 04, 2020 11:32 am
Bingo.
Excellent!
by cygmu
Wed Mar 04, 2020 3:34 am
Forum: Music Tech DIY
Topic: Transistor Matching Circuit
Replies: 6
Views: 302

Re: Transistor Matching Circuit

The YATMA is my favourite. It was fun to build too. https://www.muffwiggler.com/forum/viewtopic.php?f=17&t=153845 I have had much better results with this than with my build of the Ian Fritz circuit for some reason. I could never get the readings to settle with that. With the YATMA I get very stable...
by cygmu
Wed Mar 04, 2020 3:31 am
Forum: Music Tech DIY
Topic: TSNM how to load/save
Replies: 7
Views: 286

Re: TSNM how to load/save

I just double-checked mine against the instructions I posted and it worked as described, so it does look like yours is malfunctioning. Good luck hunting it down!
by cygmu
Fri Feb 28, 2020 12:46 pm
Forum: Music Tech DIY
Topic: TSNM how to load/save
Replies: 7
Views: 286

Re: TSNM how to load/save

OK, here goes. I don't like the manual either but I just tried this on mine and it seemed to work. Long press the encoder to get into the menu mode; LED shows MO. Turn encoder until the LED shows PR Press the encoder. LED shows the current preset number. Turn encoder to choose a number. In this stat...
by cygmu
Tue Feb 25, 2020 2:30 pm
Forum: Music Tech DIY
Topic: Doboz TSNM4U Question regarding power (buchla noob)
Replies: 7
Views: 282

Re: Doboz TSNM4U Question regarding power (buchla noob)

What is the Noisy ground on your distribution board connected to? The answer may be “nothing” and if so that would cause problems because the digital parts of the TSNM4U use that as their power supply 0V. Try connecting N to Q and see if that helps.

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