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



Joined: Mar 13, 2018
Posts: 45
Location: Russia, Zhukovsky
Audio files: 13

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



BassMaster69_VCA.jpg
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VCA
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BassMaster69_VCA.jpg



BassMaster69_SAWVCO.jpg
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Saw VCO
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BassMaster69_SAWVCO.jpg


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Hammer



Joined: Mar 13, 2018
Posts: 45
Location: Russia, Zhukovsky
Audio files: 13

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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 Filename:  Popcorn_BMS69.mp3
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Blue Hell
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Joined: Apr 03, 2004
Posts: 22567
Location: The Netherlands, Enschede
Audio files: 220
G2 patch files: 319

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
Posts: 45
Location: Russia, Zhukovsky
Audio files: 13

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
Posts: 45
Location: Russia, Zhukovsky
Audio files: 13

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
Posts: 45
Location: Russia, Zhukovsky
Audio files: 13

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:


_DSC2768.jpg
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Mynasru



Joined: May 11, 2018
Posts: 4
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



Joined: Mar 13, 2018
Posts: 45
Location: Russia, Zhukovsky
Audio files: 13

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



Joined: May 11, 2018
Posts: 4
Location: Netherlands

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



Joined: Mar 13, 2018
Posts: 45
Location: Russia, Zhukovsky
Audio files: 13

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



Joined: Mar 13, 2018
Posts: 45
Location: Russia, Zhukovsky
Audio files: 13

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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