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 Forum index » DIY Hardware and Software » Arduino
BassMaster 85
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Hammer



Joined: Mar 13, 2018
Posts: 59
Location: Russia, Zhukovsky
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PostPosted: Mon Aug 13, 2018 2:18 am    Post subject: Reply with quote  Mark this post and the followings unread

Hello, ixtern!

I will post here some of my tested cirsuits. Now I see, that it will be two more versions of BassMaster:

- BassMaster 74, TL074 based synth, +/- 12V;
- BassMaster 69, CD4069 UBE based synth, +/- 6V;

All of them will have the cheapest MT3608 DC-DC step up converter.

ATTiny 85 tested with exponential V/Oct table, and it's working fine. I only still can't make any good sounding LPF. It's possible to replicate Moog's transistor ladder LPF, but it's not my goal.

Here are some new circuits of BassMaster 69:


BassMaster69_PowerSupply.jpg
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Dual power supply
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BassMaster69_PowerSupply.jpg



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VCA
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BassMaster69_VCA.jpg



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Saw VCO
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Hammer



Joined: Mar 13, 2018
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PostPosted: Wed Aug 22, 2018 1:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

I got carried away with sodering... BassMaster 69 is fully analog, with CV/Gate interface.

Video: https://www.youtube.com/watch?v=enAQWEEOE9k


BassMaster69_Circuit_Diagram.jpg
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BassMaster 69 circuit diagram
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BassMaster69_Circuit_Diagram.jpg



Popcorn_BMS69.mp3
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Blue Hell
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Joined: Apr 03, 2004
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PostPosted: Wed Aug 22, 2018 1:48 pm    Post subject: Reply with quote  Mark this post and the followings unread

Nicely simple electronics - I love that thyristor osc thing .. that must be about as simple as it can get Cool

nice tune too Wink

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Hammer



Joined: Mar 13, 2018
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PostPosted: Wed Aug 22, 2018 2:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

Blue Hell wrote:
that must be about as simple as it can get Cool


And it's incredibly stable!

BassMaster 74 will be modular. It's very hard to make all this on one small PCB.

Some photoes:


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Hammer



Joined: Mar 13, 2018
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PostPosted: Fri Aug 24, 2018 3:34 am    Post subject: Reply with quote  Mark this post and the followings unread

I've recode ATTiny85 USB -> CV/G converter to make glissando. Is it not necessary to have ADSR envelope driven LPF for saw bass?


sawbass_BMS69.mp3
 Description:
BassMaster 69 saw bass

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Hammer



Joined: Mar 13, 2018
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PostPosted: Fri Aug 31, 2018 12:17 pm    Post subject: Reply with quote  Mark this post and the followings unread

First attempt to make eurorack case:


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Mynasru



Joined: May 11, 2018
Posts: 5
Location: Netherlands

PostPosted: Sat Oct 13, 2018 1:59 am    Post subject: Reply with quote  Mark this post and the followings unread

Amazing sound! I may be able to design some PCBs in eagle if your interested Very Happy

BTW do you know this website:
http://robstave.github.io/acs/
It has many lo-fi attiny85 examples.
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Hammer



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PostPosted: Sat Oct 13, 2018 2:22 am    Post subject: Reply with quote  Mark this post and the followings unread

Mynasru, thank you a lot!

I'm very interested in PCB, but I still not sure with circuit design.

I've already made new version of expo conerter, and some changes in power supply circuit. And I want to use iPhone as MIDI source. Now I've tested ESP8266 WiFi module as CV/G source for Korg Monotron, and it's working good with no audiable latency. Also BassMaster should have some another filter.

I'm wating for parts to solder and test new version of BassMaster, and then it will be great to help me with PCB.
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Mynasru



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PostPosted: Sat Oct 13, 2018 2:28 am    Post subject: Reply with quote  Mark this post and the followings unread

Hammer wrote:
I'm very interested in PCB, but I still not sure with circuit design.


Let me know when your design (Bassmaster or others) are ready and I'll try to help Wink
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Hammer



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PostPosted: Sat Oct 13, 2018 2:57 am    Post subject: Reply with quote  Mark this post and the followings unread

thumright
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Hammer



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PostPosted: Sat Oct 27, 2018 12:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

Eurorack case still is too expensive for me. So, I decided to make 'tiny' rack for testing new circuits for BassMaster. Height of modules is 100mm, width 10X mm.


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Hammer



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PostPosted: Wed Nov 28, 2018 4:21 am    Post subject: Reply with quote  Mark this post and the followings unread

BassMaster 85 with glide feature + Sallen Key LPF in tiny rack:
https://www.youtube.com/watch?v=0ASOCZw-jrE
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Hammer



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PostPosted: Tue Dec 11, 2018 1:11 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi again!

Two microprocessors are twice more fun than one!

I have tested several filters, even tried diode half ladder one. But I don't have enough knowledge to set them up well. Trials and errors...

Later I will return to the development of the diode filter (it sounds like boiling mercury, but I have still no success with resonance), and so far earned only Buchla-syle LPG.

But it works great!

First ATTiny85 is still used as signal source, and the second one is for vactrol LED controlling.

500Hz of Arduino PWM is not affect LDR. Now you do not need linear LDR because its possible to correct envelope by microprocessor. And I want to make sine modulation.

But vactrol must be fast. I ordered these vactrols: https://ru.aliexpress.com/item/FREE-SHIPPING-5PCS-LOT-VTL5C1-L5C1-DIP-4-IC-NEW-Original/32651474669.html

Are there any cheap fast nonlinear LDR or vactrols?

Also, you can just replace vactrols with 100k stereo pot, and it will be very useful for continuous saw bass like in my previous post.

Additional SYNC output is for a drum sequencer. It have its own MIDI channel.

There is still a lot of work, but it is already possible to design a PCB I think.


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BassMaster85VX.jpg



BMS85_VX.mp3
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BassMaster 85VX SAW test

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Last edited by Hammer on Sun Dec 16, 2018 9:17 am; edited 1 time in total
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Mynasru



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PostPosted: Tue Dec 11, 2018 2:25 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hammer wrote:

There is still a lot of work, but it is already possible to design a PCB I think.


Very nice sounds!

From the beginning of February I have time to design and order PCBs. You can refine your design in the mean time, and we can discuss some options (SMD/SMT, all in one PCB/pots etc mounted separately, etc).

Wink
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Hammer



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PostPosted: Tue Dec 11, 2018 2:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

Nice!
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Hammer



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PostPosted: Fri Dec 14, 2018 4:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

Tell me please, can I use CA3080 with 5V single supply?
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Blue Hell
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PostPosted: Fri Dec 14, 2018 4:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hammer wrote:
Tell me please, can I use CA3080 with 5V single supply?


Barely so I think ... but depends ... output voltage swing seems limited to about 1.5V from the rails .. so that looses 3V .. leaving about 2V output swing at 5V. But voltage range minimum is specified as -2V/+2V .. so it should work at least.

Also it will need some biasing when operating on a single supply .. which may get a bit tricky with it's low-ish input impedance (like 10k worst case it seems) .. could use a regulator like construction to make the virtual ground at Vcc/2 to solve that.

But maybe you can get away with these limitations ... when you can deal with a 2Vpp output excursion around Vcc/2 .. by maybe adding an opamp after.

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Hammer



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PostPosted: Sat Dec 15, 2018 12:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks, I will think.
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JovianPyx



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PostPosted: Sat Dec 15, 2018 3:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

The two schematics found here:

http://electro-music.com/forum/post-436089.html#436089

are my design and I never tested them. Psyingo wanted to try them and found some weirdness for which he made modifications and said he made it work better. I don't know what he did and didn't get a copy of his schematic, so be warned, it may take some fooling around to get it to work. If I were to try it, I'd start with the upper and then the lower.

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Hammer



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PostPosted: Sat Dec 15, 2018 3:48 pm    Post subject: Reply with quote  Mark this post and the followings unread

I've tried this schematic: http://www.experimentalistsanonymous.com/diy/Schematics/Filters%20Wahs%20and%20VCFs/4007%20Based%20VCF.pdf

CV range occurred to be quite unuseful(

The last attempt will be to use digital potentiometers. And if the attempt turns out to be unsuccessful, then I will more accurately select the vactrols.
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Hammer



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PostPosted: Sat Dec 15, 2018 5:07 pm    Post subject: Reply with quote  Mark this post and the followings unread

JovianPyx wrote:
The two schematics found here:

http://electro-music.com/forum/post-436089.html#436089


I havn't 4007, but I have k3446 MOSFETs:
https://www.datasheetspdf.com/pdf/656449/RenesasTechnology/K3446/1

May be try k3446...
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JovianPyx



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PostPosted: Sat Dec 15, 2018 5:44 pm    Post subject: Reply with quote  Mark this post and the followings unread

I designed with 4007 and 4069 in non-digital mode just to see if it will work, did several things that didn't work perfectly but were useful anyway, like saw to triangle with BS sine output (for a Fatman). I view the 4007 as a CMOS transistor array with 3 of each P and N types, sorta connected usually conveniently. Cool
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Hammer



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PostPosted: Sun Dec 16, 2018 1:19 am    Post subject: Reply with quote  Mark this post and the followings unread

I understand that, and it's great! And I always check such schematics. And I often sketch what I have checked. That's why I've been doing my synth for so long Laughing

I tried the second circuit with a stereo pot. instead of transistors, but I really did not like the sound of resonance. I have little experience, perhaps the input signal was high amplitude...

That's what I got:


4069_SK.jpg
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Hammer



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PostPosted: Sun Dec 16, 2018 2:59 am    Post subject: Reply with quote  Mark this post and the followings unread

I checked the digital potentiometers. I have only x9c103, it is 10k. It's not cover full cutoff range. Need to use x9c104 I think:
https://www.intersil.com/content/dam/Intersil/documents/x9c1/x9c102-103-104-503.pdf

I can't hear any audiable clicks from fully breadboarded circuit. Maybe some hiss sound, but this is breadboard...

Using two analog oscillators it is possible to make an ADSR circuit without using a microprocessor. On the contrary, you can use a very small microprocessor, such as Attiny 10 for decay circuit.


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Hammer



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PostPosted: Yesterday, at 5:29 am    Post subject: Reply with quote  Mark this post and the followings unread

JovianPyx, I've tested the 4069 state variable filter with k3446 MOSFETs. Filter closed at ~3V on MOSFETs gates, and opened on ~3.5V

I think it is possible to use level shifting op amp to get CV range closer to 0-5V.
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