Search found 400 matches

by SphericalSound
Wed Jan 13, 2021 5:18 pm
Forum: Music Tech DIY
Topic: DIY Niceties for the Casio CZ-101
Replies: 7
Views: 358

Re: DIY Niceties for the Casio CZ-101

I would love to dig into the FM vs PD differences and the mathematical elegance of the Casio approach. I still doesnt grasp the FM vs PD difference apart than PD is a subset of FM... Any inspired links digging into that welcome. Also, I was thinking in getting the Virtual CZ... the plogue guy has su...
by SphericalSound
Sun Jan 03, 2021 3:10 pm
Forum: Music Tech DIY
Topic: PROGUE - Analog mono synth - AUDIO DEMO
Replies: 86
Views: 4739

Re: PROGUE - Analog mono synth - AUDIO DEMO

That polyphonic demo was majestic. Kudos
by SphericalSound
Sat Jan 02, 2021 5:13 pm
Forum: Music Tech DIY
Topic: OPERA ROTAS, a DIY mutant drum machine BUILD THREAD
Replies: 203
Views: 9819

Re: OPERA ROTAS, a DIY mutant drum machine BUILD THREAD

autodafe wrote:
Sat Jan 02, 2021 3:35 pm
I have an "extra" Blue Pill and I would like to help testing the new features, if you need it ;-)
I can't wait to see the new features!!
Nice!. Send me your mail via PM
by SphericalSound
Sat Jan 02, 2021 12:48 pm
Forum: Music Tech DIY
Topic: OPERA ROTAS, a DIY mutant drum machine BUILD THREAD
Replies: 203
Views: 9819

Re: OPERA ROTAS, a DIY mutant drum machine BUILD THREAD

Wow, all of the above sounds great! Any reason for going with 6n138 instead of 6n137? Edit: the reason I’m asking is that I’ve seen several recommendations for 6n137 over 6n138, e.g. https://forum.mutable-instruments.net/t/midi-input-with-optocouplers/5255 Happy (better) new year I ordered the 8, a...
by SphericalSound
Fri Jan 01, 2021 6:28 pm
Forum: Music Tech DIY
Topic: OPERA ROTAS, a DIY mutant drum machine BUILD THREAD
Replies: 203
Views: 9819

Re: OPERA ROTAS, a DIY mutant drum machine BUILD THREAD

I don't have much height reserve though, since I gave mine an acrylic front cover plate limiting the free space 01IMGP3717.jpg Cutting and drilling that plastic material is definitely not my favorite pastime :roll: , and it will never be. The Opera Rotas just sits in the black wooden stand I made, ...
by SphericalSound
Tue Dec 29, 2020 9:05 pm
Forum: Music Tech DIY
Topic: Miasma: Function Generator (DIY PCB based on Befaco Rampage)
Replies: 280
Views: 38614

Re: Miasma: Function Generator (DIY PCB based on Befaco Rampage)

The tl074s are probably ok... Have you tried to reflow the whole enchilada?
by SphericalSound
Tue Dec 29, 2020 1:04 pm
Forum: Music Tech DIY
Topic: OPERA ROTAS, a DIY mutant drum machine BUILD THREAD
Replies: 203
Views: 9819

Re: OPERA ROTAS, a DIY mutant drum machine BUILD THREAD

I still havent found a way to export .hex files from platformio... so enjoy it as it is now. It will happen in the least expected eureka moment in 2021 Have you tried this? ---> https://community.platformio.org/t/export-compiled-hex-file/939 Aaand... I have tried this again. It happens that the tut...
by SphericalSound
Tue Dec 29, 2020 12:51 pm
Forum: Music Tech DIY
Topic: 4MHz oscillator for YM2151
Replies: 15
Views: 309

Re: 4MHz oscillator for YM2151

Nice. Pretty sure you will end with something interesting
by SphericalSound
Tue Dec 29, 2020 12:24 pm
Forum: Music Tech DIY
Topic: OPERA ROTAS, a DIY mutant drum machine BUILD THREAD
Replies: 203
Views: 9819

Re: OPERA ROTAS, a DIY mutant drum machine BUILD THREAD

I still havent found a way to export .hex files from platformio... so enjoy it as it is now. It will happen in the least expected eureka moment in 2021 Have you tried this? ---> https://community.platformio.org/t/export-compiled-hex-file/939 Yep. That was my first attempt. I have like 200 main.py f...
by SphericalSound
Mon Dec 28, 2020 5:32 pm
Forum: Music Tech DIY
Topic: OPERA ROTAS, a DIY mutant drum machine BUILD THREAD
Replies: 203
Views: 9819

Re: OPERA ROTAS, a DIY mutant drum machine BUILD THREAD

Yeah I meant a small adapter, like a midi in chiclet.

I still havent found a way to export .hex files from platformio... so enjoy it as it is now. It will happen in the least expected eureka moment in 2021
by SphericalSound
Sun Dec 27, 2020 9:16 pm
Forum: Music Tech DIY
Topic: A joystick schematic acceptance
Replies: 10
Views: 353

Re: A joystick schematic acceptance

Could be Ken Stone´s version?

In any case all joystick circuits are pretty much the same. You can look at the befaco version too if you want additional datapoints
by SphericalSound
Sun Dec 27, 2020 9:13 pm
Forum: Music Tech DIY
Topic: Eagle Files - VCO, Filters, Touch, and SeqSw
Replies: 62
Views: 2423

Re: Eagle Files - VCO, Filters, Touch, and SeqSw

If anybody has 291 spare PCBs I would gladly pay for the shipping plus a pair of beers.

I would go for homebrew vactrols. Any tutorial on how to match them?
by SphericalSound
Sun Dec 27, 2020 9:01 pm
Forum: Music Tech DIY
Topic: 4MHz oscillator for YM2151
Replies: 15
Views: 309

Re: 4MHz oscillator for YM2151

Yeah it should work. Please report your experiments and findinds
by SphericalSound
Sun Dec 27, 2020 8:52 pm
Forum: Music Tech DIY
Topic: preamp gain mod (switch to potentiometer)
Replies: 4
Views: 105

Re: preamp gain mod (switch to potentiometer)

I would say it works. Maybe any other can confirm
by SphericalSound
Sat Dec 26, 2020 8:00 am
Forum: Music Tech DIY
Topic: 4MHz oscillator for YM2151
Replies: 15
Views: 309

Re: 4MHz oscillator for YM2151

It´s way simpler to put an external 4mhz crystal than use another chip to divide the arduino clock. Normally 4mhz crystal pair well with 2x27pf, but 20 or 25pf should work too Look for schematics of people using the 2151 and copy the circuit. You can even copy from different yamaha chips than runs a...
by SphericalSound
Fri Dec 25, 2020 12:43 pm
Forum: Music Tech DIY
Topic: 4017 Envelope Idea / Simulation
Replies: 4
Views: 288

Re: 4017 Envelope Idea / Simulation

Or 10x a/r envelopes?

Whatever, a 4x env implementation would rock x4 times :D
by SphericalSound
Fri Dec 25, 2020 12:33 pm
Forum: Music Tech DIY
Topic: 4MHz oscillator for YM2151
Replies: 15
Views: 309

Re: 4MHz oscillator for YM2151

You can pretty much use any 2 pin 4mhz crystal for it, just go ebay and get the cheapest one.

And yes, you could also use one microcontroller pin clocked at 4mhz, it should run ok in theory too

Normally you need 2x27pf ceramics to stabilize the crystal too, it´s all in the schematics
by SphericalSound
Thu Dec 24, 2020 4:37 am
Forum: Music Tech DIY
Topic: New $23 ESP32 audio board on Kickstarter
Replies: 15
Views: 632

Re: New $23 ESP32 audio board on Kickstarter

Looking great. To me the thing that ESP32 needs to take off is code, not so much the hardware. There´s almost no audio code / examples out there. When you have the easy/accessible code, then you will want to go for the hardware. In any case your board seems sexy and functional. Find some programmers...
by SphericalSound
Thu Dec 24, 2020 4:28 am
Forum: Music Tech DIY
Topic: Jan Ostman - DSP Synths
Replies: 241
Views: 42008

Re: Jan Ostman - DSP Synths

You use the classic 6n138 optocoupler circuit and connect the output of the circuit to arduino pin D0 (RX)

https://arduino.stackexchange.com/quest ... with-6n138

Image
by SphericalSound
Sun Dec 20, 2020 9:10 pm
Forum: Music Tech DIY
Topic: Video Series: DIY VCF
Replies: 6
Views: 341

Re: Video Series: DIY VCF

I loved it. Eventually I will watch the whole series. Kudos
by SphericalSound
Fri Dec 18, 2020 7:48 pm
Forum: Music Tech DIY
Topic: 2164s vs OTAs (13700) what are the differences?
Replies: 26
Views: 504

Re: 2164s vs OTAs (13700) what are the differences?

guest wrote:
Fri Dec 18, 2020 3:46 pm
SphericalSound wrote:
Fri Dec 18, 2020 2:42 pm
Finally your article, guest is super interesting, but it´s a pity that it has lost all the graphics / tables.
all the graphs are appearing for when i view the page, do any appear for you?
I have followed the link again an it doesnt display the images (win 64/ chrome)
by SphericalSound
Fri Dec 18, 2020 2:55 pm
Forum: Music Tech DIY
Topic: OPERA ROTAS, a DIY mutant drum machine BUILD THREAD
Replies: 203
Views: 9819

Re: OPERA ROTAS, a DIY mutant drum machine BUILD THREAD

Ok, more updates. Mixed news. It happens that for you to update the code you need a .hex file to upload to your bluepill via the st link v2. Easy. Platformio is producing .bins intead of .hex, hence it were not working. There´s some guides on how to signal platformio to compile the .hex too, but are...
by SphericalSound
Fri Dec 18, 2020 2:42 pm
Forum: Music Tech DIY
Topic: 2164s vs OTAs (13700) what are the differences?
Replies: 26
Views: 504

Re: 2164s vs OTAs (13700) what are the differences?

Yeah, it packs a lot of info and structure in a few easy to understand lines. Thanks!!. Previously you were going to say something about the inverting nature of the OTAs, isnt? Where can I read about it? The an703 document is super dense but fascinating. Deffo I have to get some 2164s to experiment ...
by SphericalSound
Fri Dec 18, 2020 1:21 pm
Forum: Music Tech DIY
Topic: 2164s vs OTAs (13700) what are the differences?
Replies: 26
Views: 504

Re: 2164s vs OTAs (13700) what are the differences?

All great answers, thank you all. I get the big picture. Ill be reading the links tonite. So it boilds down to expo vs linear control plus a plethora of details and subtieties. Super interesting stuff Im in the point where I pretty much understand what the opamps are doing almost at a sigh of the sc...
by SphericalSound
Thu Dec 17, 2020 10:42 pm
Forum: Music Tech DIY
Topic: 2164s vs OTAs (13700) what are the differences?
Replies: 26
Views: 504

2164s vs OTAs (13700) what are the differences?

Sometimes looking at schematics I see OTAs and other times they use 2164 VCAs acting as the same function or at least similar. I understand that basicaly have the same functionality, isnt? Could you tweak one circuit to use the other? Are there any significant differences? When to use one and when t...

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