BassMaster 85

[Hammer]

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:

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BassMaster69_PowerSupply.jpg
Description:	Dual power supply
Filesize:	96.68 KB
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BassMaster69_VCA.jpg
Description:	VCA
Filesize:	112.59 KB
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BassMaster69_SAWVCO.jpg
Description:	Saw VCO
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[Hammer]

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

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

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BassMaster69_Circuit_Diagram.jpg
Description:	BassMaster 69 circuit diagram
Filesize:	434.29 KB
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Popcorn_BMS69.mp3
Description:		Download
Filename:	Popcorn_BMS69.mp3
Filesize:	1.83 MB
Downloaded:	37 Time(s)

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[Blue Hell]

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

nice tune too

[Hammer]

[Hammer]

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

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sawbass_BMS69.mp3
Description:	BassMaster 69 saw bass	Download
Filename:	sawbass_BMS69.mp3
Filesize:	309.34 KB
Downloaded:	30 Time(s)

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[Hammer]

First attempt to make eurorack case:

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_DSC2768.jpg
Description:
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[Mynasru]

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

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

[Hammer]

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.

[Mynasru]

[Hammer]