Search found 98 matches

I know i want to build the hardware version one day for the drums.

This noise PIC project i could spend a whole year, i still dont have perfect noise without glitches.

What would the HW version ...

Oh the GIE has to be before setting the timer btw..

union ShiftReg{
unsigned long value;

struct{
unsigned b10:1, b11:1, b12:1, b13:1, b14:1, b15:1, b16:1, b17:1;
unsigned b20:1, b21:1, b22:1, b23:1, b24:1, b25:1, b26:1, b27:1;
...

I am making a new project now i spend the whole night yesterday : UART controlled noise generator.
The xor bits can be selected and the pitch can be set.

I am making all options available, taking ...

I calculated wrong, i am running the noise at 12K.
I just increased it to 15K max

If i take a 32MHz chip i can get 60K max.

With DC you get clipping fast.

Ok i finally finished the noise generator in a PIC12F615 running at 8MHz.
I got it running at 3 KHz, i dont know how to make it 100 times faster.
What kind of mad ASM skills do i need ?

Anyways i ...

Oh wait, is the XOR bit taken after the shift or before ?

Dont i have to initialize the register ?
It handles itself right ?

Nice, so the noise has 1 bit output.
I did not thought this, i was thinking analog with a DAC.
Then i think it will be good, just shift a 32 bit value and add the XOR of 13 and 31 position ?
Ok.
...

http://electro-music.com/forum/phpbb-files/noise_tr_909_105.jpg

Ok thank you.

How does the original circuit output the noise on what bitrate ?
How do you output the noise from a PIC ?

Oh you mean to emulate the exact thing ?, sound like a good plan.
To me its unknown parts, i dont know how it works.

I thought : MCU noisegenerator is just a rand() function to a DAC.

What is t ...

Hi, i want to build a TR909 snare next year.

There is a 2sd1469 in the diy9090 schematic,
what transistor can replace it ?, is it important to the sound ?

And how do you make the noise generato ...

Just make the transistor exp-converter.
Like iextern says its easy, you can buy the tempco at mouser and use the schematic from the tb303.
Make some change to only need 1 1K tempco.
Else you will b ...

Ok thank you.
How do i compare it with my resistor DAC for note accuracy.
I bought 1000 x 180K 1% resistors, and measured it matching to exact 180,0K
My multimeter is not more accurate then this.
...

It is something i dont understand.
Datasheets arent my best skill.

LSB is for bits, not ohm ?

I found it :

the absolute tolerance of these resistors is
typically ±20%

That is a very false sounding synth.

you could still get away with a 7-bit DAC assuming it was calibrated correctly! In fact, the Sequential Pro-One did pretty much exactly this.

How can you know it is calibrated correctly ?
The resi ...

I am using a 4051 and sample & holds.
Every 4051 (8 CVs) costs 1 more pin.
My monosynth has currently 15 CVs.

Indeed a MCU per voice can be done with UART communication if you individually pr ...

I have a input for everything,
the cutoff has a CV on the filter,
the note has a different CV on the filter,
if i have modulation it will also have a seperate CV.
For my mono synth i have a LFO ha ...

Thank you for the reply.
I use a 8 bit DAC, and use the full range, i could add another CV for finetuning, thank you.

There is depth from the cutoff signal that might differ,
so it will be 2 fine ...

How would a Moog VCF look for a poly synth ?
i am intrested in the trimmers, to have all voices the same sound.

I like the moog sound for my polysynth,
i found the simplest moog vcf schematic in ...

Size, check the dimensions, if it dont matters then i choose the highest, they last longer.

I like to implement a lock option digitally.
What would be the best way to connect the - ?
Using a 4066 ?, then running at 5 volt or 12 volt ?

Author	Message
Topic: TR909 snare planning
VA1 Replies: 22 Views: 9102	Posted: Thu Jan 16, 2020 8:06 am Subject: TR909 snare planning Forum: DIY Hardware and Software » Developers' Corner
VA1 Replies: 22 Views: 9102	I know i want to build the hardware version one day for the drums. This noise PIC project i could spend a whole year, i still dont have perfect noise without glitches. What would the HW version ...
Topic: TR909 snare planning
VA1 Replies: 22 Views: 9102	Posted: Sun Jan 12, 2020 7:33 am Subject: TR909 snare planning Forum: DIY Hardware and Software » Developers' Corner
VA1 Replies: 22 Views: 9102	Oh the GIE has to be before setting the timer btw..
Topic: TR909 snare planning
VA1 Replies: 22 Views: 9102	Posted: Sun Jan 12, 2020 7:06 am Subject: TR909 snare planning Forum: DIY Hardware and Software » Developers' Corner
VA1 Replies: 22 Views: 9102	union ShiftReg{ unsigned long value; struct{ unsigned b10:1, b11:1, b12:1, b13:1, b14:1, b15:1, b16:1, b17:1; unsigned b20:1, b21:1, b22:1, b23:1, b24:1, b25:1, b26:1, b27:1; ...
Topic: TR909 snare planning
VA1 Replies: 22 Views: 9102	Posted: Sun Jan 12, 2020 6:56 am Subject: TR909 snare planning Forum: DIY Hardware and Software » Developers' Corner
VA1 Replies: 22 Views: 9102	I am making a new project now i spend the whole night yesterday : UART controlled noise generator. The xor bits can be selected and the pitch can be set. I am making all options available, taking ...
Topic: TR909 snare planning
VA1 Replies: 22 Views: 9102	Posted: Sat Jan 11, 2020 5:34 am Subject: TR909 snare planning Forum: DIY Hardware and Software » Developers' Corner
VA1 Replies: 22 Views: 9102	I calculated wrong, i am running the noise at 12K. I just increased it to 15K max If i take a 32MHz chip i can get 60K max.
Topic: Mixing analog voices: DC or AC ?
VA1 Replies: 12 Views: 6018	Posted: Sat Jan 11, 2020 2:53 am Subject: Mixing analog voices: DC or AC ? Forum: DIY Hardware and Software » Developers' Corner
VA1 Replies: 12 Views: 6018	With DC you get clipping fast.
Topic: TR909 snare planning
VA1 Replies: 22 Views: 9102	Posted: Sat Jan 11, 2020 2:51 am Subject: TR909 snare planning Forum: DIY Hardware and Software » Developers' Corner
VA1 Replies: 22 Views: 9102	Ok i finally finished the noise generator in a PIC12F615 running at 8MHz. I got it running at 3 KHz, i dont know how to make it 100 times faster. What kind of mad ASM skills do i need ? Anyways i ...
Topic: TR909 snare planning
VA1 Replies: 22 Views: 9102	Posted: Sat Dec 21, 2019 11:08 am Subject: TR909 snare planning Forum: DIY Hardware and Software » Developers' Corner
VA1 Replies: 22 Views: 9102	Oh wait, is the XOR bit taken after the shift or before ?
Topic: TR909 snare planning
VA1 Replies: 22 Views: 9102	Posted: Sat Dec 21, 2019 10:56 am Subject: TR909 snare planning Forum: DIY Hardware and Software » Developers' Corner
VA1 Replies: 22 Views: 9102	Dont i have to initialize the register ? It handles itself right ?
Topic: TR909 snare planning
VA1 Replies: 22 Views: 9102	Posted: Sat Dec 21, 2019 10:42 am Subject: TR909 snare planning Forum: DIY Hardware and Software » Developers' Corner
VA1 Replies: 22 Views: 9102	Nice, so the noise has 1 bit output. I did not thought this, i was thinking analog with a DAC. Then i think it will be good, just shift a 32 bit value and add the XOR of 13 and 31 position ? Ok. ...
Topic: TR909 snare planning
VA1 Replies: 22 Views: 9102	Posted: Sat Dec 21, 2019 9:04 am Subject: TR909 snare planning Forum: DIY Hardware and Software » Developers' Corner
VA1 Replies: 22 Views: 9102	http://electro-music.com/forum/phpbb-files/noise_tr_909_105.jpg
Topic: TR909 snare planning
VA1 Replies: 22 Views: 9102	Posted: Sat Dec 21, 2019 8:59 am Subject: TR909 snare planning Forum: DIY Hardware and Software » Developers' Corner
VA1 Replies: 22 Views: 9102	Ok thank you. How does the original circuit output the noise on what bitrate ? How do you output the noise from a PIC ?
Topic: TR909 snare planning
VA1 Replies: 22 Views: 9102	Posted: Sat Dec 21, 2019 8:22 am Subject: TR909 snare planning Forum: DIY Hardware and Software » Developers' Corner
VA1 Replies: 22 Views: 9102	Oh you mean to emulate the exact thing ?, sound like a good plan. To me its unknown parts, i dont know how it works. I thought : MCU noisegenerator is just a rand() function to a DAC. What is t ...
Topic: TR909 snare planning
VA1 Replies: 22 Views: 9102	Posted: Wed Dec 18, 2019 8:59 am Subject: TR909 snare planning Subject description: TR909 snare planning Forum: DIY Hardware and Software » Developers' Corner
VA1 Replies: 22 Views: 9102	Hi, i want to build a TR909 snare next year. There is a 2sd1469 in the diy9090 schematic, what transistor can replace it ?, is it important to the sound ? And how do you make the noise generato ...
Topic: VCO - handling 1v/oct with a microcontroller?
VA1 Replies: 10 Views: 7433	Posted: Wed Oct 30, 2019 10:14 am Subject: VCO - handling 1v/oct with a microcontroller? Forum: DIY Hardware and Software » Developers' Corner
VA1 Replies: 10 Views: 7433	Just make the transistor exp-converter. Like iextern says its easy, you can buy the tempco at mouser and use the schematic from the tb303. Make some change to only need 1 1K tempco. Else you will b ...
Topic: Poly synth VCF trimmers
VA1 Replies: 14 Views: 8396	Posted: Thu Oct 17, 2019 6:47 am Subject: Poly synth VCF trimmers Forum: DIY Hardware and Software » Developers' Corner
VA1 Replies: 14 Views: 8396	Ok thank you. How do i compare it with my resistor DAC for note accuracy. I bought 1000 x 180K 1% resistors, and measured it matching to exact 180,0K My multimeter is not more accurate then this. ...
Topic: Poly synth VCF trimmers
VA1 Replies: 14 Views: 8396	Posted: Wed Oct 16, 2019 8:48 am Subject: Poly synth VCF trimmers Forum: DIY Hardware and Software » Developers' Corner
VA1 Replies: 14 Views: 8396	It is something i dont understand. Datasheets arent my best skill. LSB is for bits, not ohm ?
Topic: Poly synth VCF trimmers
VA1 Replies: 14 Views: 8396	Posted: Wed Oct 16, 2019 7:16 am Subject: Poly synth VCF trimmers Forum: DIY Hardware and Software » Developers' Corner
VA1 Replies: 14 Views: 8396	I found it : the absolute tolerance of these resistors is typically ±20% That is a very false sounding synth.
Topic: Poly synth VCF trimmers
VA1 Replies: 14 Views: 8396	Posted: Wed Oct 16, 2019 2:02 am Subject: Poly synth VCF trimmers Forum: DIY Hardware and Software » Developers' Corner
VA1 Replies: 14 Views: 8396	you could still get away with a 7-bit DAC assuming it was calibrated correctly! In fact, the Sequential Pro-One did pretty much exactly this. How can you know it is calibrated correctly ? The resi ...
Topic: Poly synth VCF trimmers
VA1 Replies: 14 Views: 8396	Posted: Sun Oct 13, 2019 9:55 am Subject: Poly synth VCF trimmers Forum: DIY Hardware and Software » Developers' Corner
VA1 Replies: 14 Views: 8396	I am using a 4051 and sample & holds. Every 4051 (8 CVs) costs 1 more pin. My monosynth has currently 15 CVs. Indeed a MCU per voice can be done with UART communication if you individually pr ...
Topic: Poly synth VCF trimmers
VA1 Replies: 14 Views: 8396	Posted: Sun Oct 13, 2019 5:47 am Subject: Poly synth VCF trimmers Forum: DIY Hardware and Software » Developers' Corner
VA1 Replies: 14 Views: 8396	I have a input for everything, the cutoff has a CV on the filter, the note has a different CV on the filter, if i have modulation it will also have a seperate CV. For my mono synth i have a LFO ha ...
Topic: Poly synth VCF trimmers
VA1 Replies: 14 Views: 8396	Posted: Sat Oct 12, 2019 7:22 am Subject: Poly synth VCF trimmers Forum: DIY Hardware and Software » Developers' Corner
VA1 Replies: 14 Views: 8396	Thank you for the reply. I use a 8 bit DAC, and use the full range, i could add another CV for finetuning, thank you. There is depth from the cutoff signal that might differ, so it will be 2 fine ...
Topic: Poly synth VCF trimmers
VA1 Replies: 14 Views: 8396	Posted: Thu Aug 01, 2019 8:19 am Subject: Poly synth VCF trimmers Forum: DIY Hardware and Software » Developers' Corner
VA1 Replies: 14 Views: 8396	How would a Moog VCF look for a poly synth ? i am intrested in the trimmers, to have all voices the same sound. I like the moog sound for my polysynth, i found the simplest moog vcf schematic in ...
Topic: How to Choose the right Capacitor
VA1 Replies: 36 Views: 71088	Posted: Wed Jun 19, 2019 9:24 am Subject: How to Choose the right Capacitor Forum: DIY Hardware and Software » Developers' Corner
VA1 Replies: 36 Views: 71088	Size, check the dimensions, if it dont matters then i choose the highest, they last longer.
Topic: Dual TB303 VCO going in sync problem.
VA1 Replies: 4 Views: 5284	Posted: Tue Jun 04, 2019 8:17 am Subject: Dual TB303 VCO going in sync problem. Forum: DIY Hardware and Software » Developers' Corner
VA1 Replies: 4 Views: 5284	I like to implement a lock option digitally. What would be the best way to connect the - ? Using a 4066 ?, then running at 5 volt or 12 volt ?