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



Joined: Mar 13, 2018
Posts: 12
Location: Russia, Zhukovsky
Audio files: 6

PostPosted: Sun Mar 18, 2018 3:31 am    Post subject: BassMaster 85 Reply with quote  Mark this post and the followings unread

Hello!

My project based on Digispark - ATTiny 85 16MHz arduino programmable.

The main idea is that it's possible to use two PWM outputs for DDS. One of them will be the main wave generator, other will be the envelope shaper.

But I could't find any simple, but good VCA, utill i saw elektrouwe 7052A circuit in this topic: http://electro-music.com/forum/post-405863.html#405863

In MIDI interface you can use channels to tell ATTiny 85 what kind of waves to generate i.e. 1st channel - sine, 4th channel - square, 5th channel - white noise and so on.

Here is short sample (triangle & pulse - lead, square - bass): https://www.youtube.com/watch?v=YfB4YF5tCFE

It was recorded with soviet 562LN1 chip, 4069 sounds not so bright.

BassMaster 85 have just 8kHz bitrate, but LPF and analog VCA helps to eliminate dizzy digital noise.

Here is the circuit diagram. I still not sure, thal levels between ATTiny 85 and TDA 7052 are OK, because triangle is not always triangle, and square wave is not always sharp.

I want to make envelope follower on 1/2 of 4069, and mix this envelope signal to the LPFcontrol via vactrol. Is it a good idea?

Links:
https://github.com/heartscrytech/DigisparkMIDI - DigiMIDI library
https://janostman.wordpress.com/cheap-diy-usb-midi-to-cv-interface/ - how to use DigiMIDI library
http://aeeprojects.blogspot.ru/2011/09/filters-with-cd4069.html - 4069 filter circuits


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BassMaster 85 circuit diagram
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bassmaster_circuit.jpg



Last edited by Hammer on Sun Apr 08, 2018 1:38 am; edited 2 times in total
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Hammer



Joined: Mar 13, 2018
Posts: 12
Location: Russia, Zhukovsky
Audio files: 6

PostPosted: Sat Mar 24, 2018 12:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

BassMaster 85C (chimera) because it is 3/4 digital, 1/4 analog.

Cutoff is driving by ATTiny85, resonance is still manual. JFETs for LPF are soviet again 2П303A, because I haven't others around.

I will post full code a bit later, it's still very dirty.

Check the sound!


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BMS85_Test_saw.mp3
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BMS85_Test_square_saw.mp3
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Hammer



Joined: Mar 13, 2018
Posts: 12
Location: Russia, Zhukovsky
Audio files: 6

PostPosted: Sun Apr 08, 2018 1:49 am    Post subject: Reply with quote  Mark this post and the followings unread

Trying to make sound "brighter". I've made another one SVF, but with additional feedback from BP output.

Then I've made "Most simple VCF on earth" to simplify circuit. Now i'ts possible to make my synth in size of credit card.

All three filters sounds and circuit:


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BMS85_Test_stereo_LPF_CT.mp3
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BMS85_Test_stereo_LPF_SVF.mp3
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BMS85_Test_stereo_LPF_SVF_2.mp3
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petegaggs



Joined: Jan 04, 2018
Posts: 22
Location: Cambridge, UK
Audio files: 1

PostPosted: Tue Apr 10, 2018 9:50 am    Post subject: Reply with quote  Mark this post and the followings unread

this is very cool, you have managed to make something that sounds really good with very few parts
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Hammer



Joined: Mar 13, 2018
Posts: 12
Location: Russia, Zhukovsky
Audio files: 6

PostPosted: Wed Apr 11, 2018 7:15 am    Post subject: Reply with quote  Mark this post and the followings unread

I hope so! Thank you a lot!

I'll be back soon with full circuit and code.
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