Search found 1065 matches

by gbiz
Wed Feb 17, 2021 4:38 pm
Forum: Music Tech DIY
Topic: SMT Vs. Thru-hole? (signal quality)
Replies: 47
Views: 3101

Re: SMT Vs. Thru-hole? (signal quality)

Oh indeed. Agree with all that, even if some is stating the bleeding obvious. "Don't reuse the part after removal with a soldering iron". lol. Good luck reusing that semi-molten pile you have on your bench :) And as i said, i saw firsthand what happens if you contact them with the iron. I always rtf...
by gbiz
Wed Feb 17, 2021 2:03 pm
Forum: Music Tech DIY
Topic: SMT Vs. Thru-hole? (signal quality)
Replies: 47
Views: 3101

Re: SMT Vs. Thru-hole? (signal quality)

Yeah, i like them. They perfectly suit the sound of that filter. I've built three of those filters up with them, they're my default filter. though one has a noise mezzanine board so it's usually used for percussive duties. Downside with them, they're way more fragile than "regular" smt mlcc caps. Th...
by gbiz
Sun Feb 07, 2021 5:49 am
Forum: Music Tech DIY
Topic: Post-Brexit Mouser
Replies: 20
Views: 574

Re: Post-Brexit Mouser

ljwall83 wrote:
Sun Feb 07, 2021 4:48 am

Slight tangent but I just checked JLCPCB. Their VAT page says they'll be charging VAT to UK customers on orders under 135.
I put a small order in with them on friday & the payment page states they're now collecting vat for uk orders.
by gbiz
Sat Feb 06, 2021 5:07 pm
Forum: Music Tech DIY
Topic: Post-Brexit Mouser
Replies: 20
Views: 574

Re: Post-Brexit Mouser

Theres been a banner at the top of the mouser.co.uk page for the last couple of months explaining this. Theres no change if you're not registered for VAT, they collect it when you pay, as they always have. You won't get stung for additional customs collection charges as the duty has already been pai...
by gbiz
Fri Feb 05, 2021 12:38 pm
Forum: Music Tech DIY
Topic: performer (or is it per|former?) sequencer build
Replies: 813
Views: 54601

Re: performer (or is it per|former?) sequencer build

I've never heard of them flipping a bit in flash memory (this is permanent as it persists across reboots). I know it used to be an issue with dram, less so now as a lot of that has ecc.
by gbiz
Fri Feb 05, 2021 10:30 am
Forum: Music Tech DIY
Topic: performer (or is it per|former?) sequencer build
Replies: 813
Views: 54601

Re: performer (or is it per|former?) sequencer build

It only takes one corrupted bit in a vector, jump or branch address in the program code to have the MCU executing from an invalid location.
by gbiz
Thu Feb 04, 2021 6:46 am
Forum: Music Tech DIY
Topic: Raspberry Pi as microprocessor for polyphonic diy analog synth?
Replies: 22
Views: 617

Re: Raspberry Pi as microprocessor for polyphonic diy analog synth?

Slightly offtopic ... For jitter on the PI, as in any Linux system, theres some basic tunings you can/should do to improve the deterministic behaviour of your applications. Most people don't seem to bother doing this, they just run the application as-is & assume the scheduler will do the best thing ...
by gbiz
Tue Feb 02, 2021 8:04 am
Forum: Music Tech DIY
Topic: Raspberry Pi as microprocessor for polyphonic diy analog synth?
Replies: 22
Views: 617

Re: Raspberry Pi as microprocessor for polyphonic diy analog synth?

Wifi on an 8-bit avr ?. Pi gives you wifi ootb, plus the ability to do things like use a web server to recall those stored patch configurations. And a lot of different programming language choices. Coding the UI will be a lot easier. If you're concerned about corruption of the filesystem, run it in ...
by gbiz
Tue Feb 02, 2021 7:52 am
Forum: Music Tech DIY
Topic: Question about DACs accuracy
Replies: 18
Views: 522

Re: Question about DACs accuracy

What ixtern says. If you're at all worried about linerarity you'll need a calibration routine to create a device specific LUT with these MCP4xxx DACs. You might get lucky going through a tube of them & find one that's linear throughout the range. You're not the first to notice this., it's been discu...
by gbiz
Tue Jan 19, 2021 7:03 pm
Forum: Music Tech DIY
Topic: [DEMOS ADDED!] Mutant Hihats eurorack DIY PCB/panel sets
Replies: 135
Views: 18004

Re: [DEMOS ADDED!] Mutant Hihats eurorack DIY PCB/panel sets

Have you adjusted the decay trimpot ?.
by gbiz
Tue Dec 29, 2020 6:12 am
Forum: Music Tech DIY
Topic: PCBs as Front Panels ?
Replies: 269
Views: 24983

Re: PCBs as Front Panels ?

interesting, I don't think I've ever had scratched panel PCBs from Seeed. What options are you folks selecting when ordering your panels? ENIG and 1oz copper? What are you doing in design stage? Do you have full copper pours? Do you pull back the soldermask around drill holes for pots etc? What do ...
by gbiz
Mon Dec 28, 2020 7:46 am
Forum: Music Tech DIY
Topic: PCBs as Front Panels ?
Replies: 269
Views: 24983

Re: PCBs as Front Panels ?

I probably should have added that I've never used Dirty PCBs for front panels. That comment was more about them being a general PCB fab that offers a cheap regular postage option. Given how much they charge, if i got front panels from there, i'd expect them to be scratched. Those unused scratched pa...
by gbiz
Sun Dec 27, 2020 10:02 am
Forum: Music Tech DIY
Topic: PCBs as Front Panels ?
Replies: 269
Views: 24983

Re: PCBs as Front Panels ?

the engineers who run your gerbers don't necessarily expect you to be making front panels... THIS. 100% A few years back I had an email conversation with someone in PCBWay support, after a particularly bad batch where most were really badly scratched. They said that PCBs for front panels goes throu...
by gbiz
Thu Dec 10, 2020 9:27 am
Forum: Music Tech DIY
Topic: Buy small numbers of 74HC DIP in UK ?
Replies: 6
Views: 253

Re: Buy small numbers of 74HC DIP in UK ?

Hi Dave

Bitsbox & Cricklewood sell in small quantities, though it's been a long time since i've bought anything from either, so i don't know what the service is like from either now.
by gbiz
Wed Dec 09, 2020 6:24 am
Forum: Artist Discussion
Topic: R.I.P. Harold Budd
Replies: 21
Views: 847

Re: R.I.P. Harold Budd

Sad news.

You have it there cptnal. So much great music. After i saw the news in the Guardian, I went to line up a "nothing but Budd for today" playlist, I'd forgotten how much great music he'd done. It was hard to decide what to go for first. "Music for 3 Pianos" playing now. Bill Nelson to follow.
by gbiz
Thu Nov 05, 2020 6:15 am
Forum: Music Tech DIY
Topic: [closed] µDervish 8HP FV-1 FX
Replies: 167
Views: 21718

Re: [closed] µDervish 8HP FV-1 FX

It's failing the initial static voltage check. There's some suggestions at the start of the debug section for voltage checks that fail. I assume the other end of the diodes is those voltages plus the ~600mV drop. It'd be useful to know that. And what are the other static testpoint voltages on the u...
by gbiz
Wed Nov 04, 2020 9:31 am
Forum: Music Tech DIY
Topic: [closed] µDervish 8HP FV-1 FX
Replies: 167
Views: 21718

Re: [closed] µDervish 8HP FV-1 FX

It's failing the initial static voltage check. There's some suggestions at the start of the debug section for voltage checks that fail. I assume the other end of the diodes is those voltages plus the ~600mV drop. It'd be useful to know that. And what are the other static testpoint voltages on the uD...
by gbiz
Tue Oct 13, 2020 10:09 am
Forum: Music Tech DIY
Topic: [closed] Dervish: 12HP FV-1 euro FX
Replies: 744
Views: 77482

Re: [closed] Dervish: 12HP FV-1 euro FX

hi djamsia, sure. ping me an email.
by gbiz
Mon Oct 12, 2020 9:34 am
Forum: Music Tech DIY
Topic: [closed] µDervish 8HP FV-1 FX
Replies: 167
Views: 21718

Re: [closed] µDervish 8HP FV-1 FX

dubtoms, if you don't mind getting your own panel made up, I've still got a couple of PCB pairs left.
by gbiz
Wed Sep 09, 2020 4:43 am
Forum: Music Tech DIY
Topic: terminal tedium (raspberry zero, pi2, pi3 codec / pd thing)
Replies: 929
Views: 120637

Re: terminal tedium (raspberry zero, pi2, pi3 codec / pd thing)

There's also some bytes in the controller init sequence that determine the RAM to screen mapping. One changes the scan direction, the other the mapping so you can flip the screen without changing the drawing code. Similarly you can bake in the 2px offset. a cool - that would be one(or two) more byt...
by gbiz
Sat Aug 29, 2020 1:11 pm
Forum: Music Tech DIY
Topic: terminal tedium (raspberry zero, pi2, pi3 codec / pd thing)
Replies: 929
Views: 120637

Re: terminal tedium (raspberry zero, pi2, pi3 codec / pd thing)

Yes that could be it. I had a quick look into what could cause SIGILL on the Pi. Binaries built for ARMv7 or 8 would do this on an an ARMv6. File doesn't show the architecture the binary is built for, which is why they possibly all look the same, but "readelf -A " shows the cpu arch the binary was b...
by gbiz
Sat Aug 29, 2020 11:34 am
Forum: Music Tech DIY
Topic: terminal tedium (raspberry zero, pi2, pi3 codec / pd thing)
Replies: 929
Views: 120637

Re: terminal tedium (raspberry zero, pi2, pi3 codec / pd thing)

As nobody else has mentioned it, a general observation on this from a linux/unix perspective ... Whatever it is you are running there is being killed due to an illegal instruction (SIGILL, signal 4). pd was reporting the same thing in the logs on the previous page. As it's the only issue you're gett...
by gbiz
Sun Aug 16, 2020 4:57 pm
Forum: Music Tech DIY
Topic: [closed] µDervish 8HP FV-1 FX
Replies: 167
Views: 21718

Re: µDervish 8HP FV-1 FX

mager, there's a Mouser cart for the red ATMega programmer that has all the components you need. A link to the cart is at the top of the ATMega programmer BOM sheet. Or if you've got a teensy3 spare it's easy enough to build one out of one of those. Details are in the programmer directory. Don't use...
by gbiz
Sun Aug 16, 2020 4:32 pm
Forum: Music Tech DIY
Topic: performer (or is it per|former?) sequencer build
Replies: 813
Views: 54601

Re: performer (or is it per|former?) sequencer build

I took everything from 0 and I followed the instructions on this page: https://github.com/westlicht/performer/blob/master/README.md and I find myself stuck again in the previous step: "xx:performer xx$ make setup_stm32 (mkdir -p /Users/xx/performer/./build/stm32/debug && cd /Users/xx/performer/./bu...
by gbiz
Fri Aug 14, 2020 3:18 pm
Forum: Music Tech DIY
Topic: [closed] µDervish 8HP FV-1 FX
Replies: 167
Views: 21718

Re: µDervish 8HP FV-1 FX

There's no reason i can immediately think of why those 2 programs wouldn't exhibit it & others would. They use both left & right adc & dac channels, as do other programs. I'd start by investigating the issue with output 2. My guess is that'll be the cause of the hum. There's a section in the build g...

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