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.
It was recorded with soviet 561LN2 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?
You know, I was stucked with VCF. This "Most simple VCF on earth" is very noisy. And I can't understand corellation between the lead envelope and LPF envelope to make it more "moogy".
Anyway, here you will find the code, but it's still very raw.
When you upload sketch into Digispark, your PC will find new device. In FL Studio set a port for MidiStomp, I use port #5. Open attached example for FL Studio.
Hi
i have built the Bassmaster 85CT from your last Post
after upload the code into the Attiny85 i check the functions and
I can switch between the Waveforms Nice and
I can play various Notes but the
Attack and Release pots don't work
if I turn the pot which one goes to pin 1 of the Attiny85 (A0)
over the half the Attiny lost her connection to USB if I turn
the pot back the bassmaster go on!
thanks for this work
It's mean, that your AtTiny 85 is working properly!
A0 - reset pin. You are resetting your chip by the pot. There are two versions of Digispark, with unlocked reset pit (you may flash it with USBasp), and with locked by fuses. Locked version could be flashed only by high voltage programmer, but it lets you to use reset pin as input / output.
In your version, you can use only one pot.
In code change:
#define ENVELOPE_ATTACK A0 // Pot
#define ENVELOPE_DECAY A1 // Pot
To:
#define ENVELOPE_ATTACK A1 // Pot
#define ENVELOPE_DECAY A0 // Pot
And it will be possible to attenuate attack. I'm using single pot too.
Also, you can make a switch between Digispark and VCF - very useful!
My experience with Ritm-2 shows me that BassMaster should have standalone filter EG. It needs a new filter. Can you recommend some good 5V filter circuit? Or better to go to the bipolar power supply?
Last edited by Hammer on Thu Jan 31, 2019 2:08 am; edited 1 time in total
I want to convert BassMaster into something more useful. 5V USB power is very noisy, LPF is noisy, 8kHz DDS synthesis is very noisy...
So, what I want to do:
1. Extrnal dual power supply.
2. Make VCO more analog.
3. Make good LPF.
4. Play MIDI file from SD card.
5. Make it compatible with RhythmMaster 85.
6. Keep it all as simple as it possible.
I've started with dual power supply. I've just soldered together cheap MT3608 DC-DC Step Up converter and virtual ground circuit (it's very similar to RITM-2 power supply) of Sijosae: https://tangentsoft.net/elec/vgrounds.html
Tested with op amp saw VCO - no any noise!!!
PS_dual.jpg
Description:
Filesize:
954.52 KB
Viewed:
353 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.
I want to convert BassMaster into something more useful. 5V USB power is very noisy, LPF is noisy, 8kHz DDS synthesis is very noisy...
So, what I want to do:
1. Extrnal dual power supply.
2. Make VCO more analog.
3. Make good LPF.
4. Play MIDI file from SD card.
5. Make it compatible with RhythmMaster 85.
6. Keep it all as simple as it possible.
I've started with dual power supply. I've just soldered together cheap MT3608 DC-DC Step Up converter and virtual ground circuit (it's very similar to RITM-2 power supply) of Sijosae: https://tangentsoft.net/elec/vgrounds.html
Tested with op amp saw VCO - no any noise!!!
Nice piece of work. As you have dual power supply range of possible circuits is much wider than with +5V only.
Attaching simple VCO and VCF diagrams, may will be some help. Also simple +5V VCF from gasboss, don't know if any use of it.
I haven't made any of them, just collecting schematics
schmitzbits_CMOS 4007 filter and VCA_vcf4007_s.gif
Description:
Filesize:
17.74 KB
Viewed:
356 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.
3046_vco_832.gif
Description:
Filesize:
1.16 MB
Viewed:
401 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.
28538_lunetta_filter_1N4148_1.gif
Description:
Filesize:
31.41 KB
Viewed:
372 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum You cannot attach files in this forum You can download files in this forum