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Tom, your link is dead. Could you repost?

Sorry to raise a necro-thread, but for anyone who finds this via google or whatever, I've pput the notes back online at:

https://electricdruid.net/e ...

Ok i See thank you
I got some nanos and mcp4725 breakouts laying around I might just try with that a bit, and see how it sounds

I use 4725s and nanos a lot for general CV applications.

A tric ...

NCO => PDM? very interesting.

I found this

Sorry, haven't been back around here for while, so I've only just seen this.

Yes, the STOMPLFO uses this for its output.

The NCO module on so ...

You say "DC/ AC sub-audio" so I don't see why a audio codec is a proposed solution. You may well find an audio codec would have highpass filters making sending DC out of it impossible. An 8- ...

a standard opamp already is voltage controlled.

No, it isn't. Not in the sense that a voltage-controlled filter is voltage controlled.

An OTA on the other hand has an "Iabc" current ...

copy that.

But Smile

there are also FM-Bass sounds? And even though it would not be "real" FM i guess it could enhance the sound spectrum.

But, i could also imagine that u have a ton of ...

well "just" make it thru Zero! Cool

The point of making it thru-zero would be for FM sounds, but the ADC inputs aren't fast enough for audio rate modulation, so it wouldn't wo ...

This page is the one you want:

http://www.geofex.com/Article_Folders/panner.pdf

The circuit in the box in the middle-left of the first page does exactly the wet/dry mix you're looking for.

HT ...

Nice work!

It's good to see people still enjoying the Waverider/VCDO chip.

It's long overdue an update, but I'm never quite sure where to take it next. That's due to a surfeit of options, not a ...

Hey AmpedVoltz, did you ever get to the bottom of this?

Firstly, thanks a lot this looks really helpful.
Secondly, we already have a PIC18F25K from our other classes so we thought we would just use that. It has a DAC module but it's only 32 steps so ...

I wish EN collection was not local only.

Sad

Yeah, me too, but you can kinda see why it is!

T.

Hey everyone,
So I'm an enginnering student and we have a project where we have to build a PIC processor based Bass Synthisizer. We are only in the brainstorming phase for now and I was thinking:

...

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

Whether you get glitches depends on the sequence. Not all feedback bit positions produce maxim ...

It looks pretty efficient to me (at least for C!).

The only way you'd manage to get that to go faster would be to have a look at what it compiles into, and then see if altering things makes the res ...

With the chip running at 8MHz, you've only got a 2MHz instruction cycle, so that doesn't give you much time. Say we're aiming for 100KHz output rate - that's only twenty instructions. Still, for a bas ...

Nice, so the noise has 1 bit output.
I did not thought this, i was thinking analog with a DAC.

It *is* a bit weird, but you can think of it as a 1-bit DAC! It's the average level over time that va ...

How does the original circuit output the noise on what bitrate ?

It's a series of on/off digital bits coming out of pin 9 of IC33. The register is clocked at ~300KHz, so the bits come out at th ...

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

Fair enough. No reason why you should! The TR-909 noise generator is a hardwa ...

Hi, i want to build a TR909 snare next year.
I dont want to use a MCU for the digital noise, i like to clone the original.

Given that the original uses a 32-stage shift-register based noise gene ...

My remark about filtering was because a lot of pwm led control uses 50Hz as base frequency, and I'm (almost) sure that 50Hz will give a severe hum at the LDR side of the vactrol.

Depends how slow ...

If you're using the PWM to drive a Vactrol's LED, you don't need any filtering. In fact, you're definitely better off without it. You said in [url=https://audiodiwhy.blogspot.com/2019/12/taming-vactro ...

It is something i dont understand.
LSB is for bits, not ohm ?

Yes. LSB is "least significant bit". The accuracy and/or linearity of a DAC is usually specified in terms of its smallest ...

I found it :

the absolute tolerance of these resistors is
typically ±20%

That is a very false sounding synth.

No, that's a mis-reading of the datasheet. +/-0.5 LSB is more like it. The syn ...

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 ...

Author	Message
Topic: Anyone working on an Arduino-based ADSR?
Electric Druid Replies: 23 Views: 36635	Posted: Thu Aug 11, 2022 5:26 am Subject: Re: Envelope generators on a PIC/AVR Forum: DIY Hardware and Software » Microcontrollers and Programmable Logic
Electric Druid Replies: 23 Views: 36635	Tom, your link is dead. Could you repost? Sorry to raise a necro-thread, but for anyone who finds this via google or whatever, I've pput the notes back online at: https://electricdruid.net/e ...
Topic: Samplerate and Bitdepht of CV Generators
Electric Druid Replies: 8 Views: 8420	Posted: Wed Jul 22, 2020 2:29 pm Subject: Samplerate and Bitdepht of CV Generators Forum: DIY Hardware and Software » Arduino
Electric Druid Replies: 8 Views: 8420	Ok i See thank you I got some nanos and mcp4725 breakouts laying around I might just try with that a bit, and see how it sounds I use 4725s and nanos a lot for general CV applications. A tric ...
Topic: PIC Wave generation
Electric Druid Replies: 9 Views: 10130	Posted: Wed Jul 22, 2020 2:07 pm Subject: PIC Wave generation Forum: DIY Hardware and Software » Microcontrollers and Programmable Logic
Electric Druid Replies: 9 Views: 10130	NCO => PDM? very interesting. I found this Sorry, haven't been back around here for while, so I've only just seen this. Yes, the STOMPLFO uses this for its output. The NCO module on so ...
Topic: Generate CV signal - PWM or DAC?
Electric Druid Replies: 3 Views: 5933	Posted: Wed Jul 22, 2020 1:54 pm Subject: Generate CV signal - PWM or DAC? Forum: DIY Hardware and Software » Microcontrollers and Programmable Logic
Electric Druid Replies: 3 Views: 5933	You say "DC/ AC sub-audio" so I don't see why a audio codec is a proposed solution. You may well find an audio codec would have highpass filters making sending DC out of it impossible. An 8- ...
Topic: Why Can't a VCA just be an opamp
Electric Druid Replies: 6 Views: 5122	Posted: Thu Jul 09, 2020 5:27 pm Subject: Re: Why Can't a VCA just be an opamp Forum: DIY Hardware and Software
Electric Druid Replies: 6 Views: 5122	a standard opamp already is voltage controlled. No, it isn't. Not in the sense that a voltage-controlled filter is voltage controlled. An OTA on the other hand has an "Iabc" current ...
Topic: Frequency Central WaveRiders
Electric Druid Replies: 8 Views: 4046	Posted: Wed Jun 03, 2020 11:52 am Subject: Frequency Central WaveRiders Forum: DIY Hardware and Software
Electric Druid Replies: 8 Views: 4046	copy that. But there are also FM-Bass sounds? And even though it would not be "real" FM i guess it could enhance the sound spectrum. But, i could also imagine that u have a ton of ...
Topic: Frequency Central WaveRiders
Electric Druid Replies: 8 Views: 4046	Posted: Wed Jun 03, 2020 4:58 am Subject: Frequency Central WaveRiders Forum: DIY Hardware and Software
Electric Druid Replies: 8 Views: 4046	well "just" make it thru Zero! The point of making it thru-zero would be for FM sounds, but the ADC inputs aren't fast enough for audio rate modulation, so it wouldn't wo ...
Topic: Dry/Wet Control Schematic
Electric Druid Replies: 6 Views: 5859	Posted: Sun May 31, 2020 3:15 pm Subject: Dry/Wet Control Schematic Forum: DIY Hardware and Software
Electric Druid Replies: 6 Views: 5859	This page is the one you want: http://www.geofex.com/Article_Folders/panner.pdf The circuit in the box in the middle-left of the first page does exactly the wet/dry mix you're looking for. HT ...
Topic: Frequency Central WaveRiders
Electric Druid Replies: 8 Views: 4046	Posted: Sun May 31, 2020 2:24 pm Subject: Frequency Central WaveRiders Forum: DIY Hardware and Software
Electric Druid Replies: 8 Views: 4046	Nice work! It's good to see people still enjoying the Waverider/VCDO chip. It's long overdue an update, but I'm never quite sure where to take it next. That's due to a surfeit of options, not a ...
Topic: AS3320 vcf schematic checkup
Electric Druid Replies: 6 Views: 3199	Posted: Sun May 31, 2020 2:18 pm Subject: AS3320 vcf schematic checkup Forum: DIY Hardware and Software
Electric Druid Replies: 6 Views: 3199	Hey AmpedVoltz, did you ever get to the bottom of this?
Topic: PIC Wave generation
Electric Druid Replies: 9 Views: 10130	Posted: Sat Jan 25, 2020 4:11 pm Subject: Re: PIC Wave generation Forum: DIY Hardware and Software » Microcontrollers and Programmable Logic
Electric Druid Replies: 9 Views: 10130	Firstly, thanks a lot this looks really helpful. Secondly, we already have a PIC18F25K from our other classes so we thought we would just use that. It has a DAC module but it's only 32 steps so ...
Topic: Synth Kits
Electric Druid Replies: 4 Views: 6812	Posted: Fri Jan 24, 2020 6:22 pm Subject: Synth Kits Forum: Wanted, For Sale, Opportunities and Requests » Parts and Components
Electric Druid Replies: 4 Views: 6812	I wish EN collection was not local only. Yeah, me too, but you can kinda see why it is! T.
Topic: PIC Wave generation
Electric Druid Replies: 9 Views: 10130	Posted: Fri Jan 24, 2020 6:20 pm Subject: Re: PIC Wave generation Forum: DIY Hardware and Software » Microcontrollers and Programmable Logic
Electric Druid Replies: 9 Views: 10130	Hey everyone, So I'm an enginnering student and we have a project where we have to build a PIC processor based Bass Synthisizer. We are only in the brainstorming phase for now and I was thinking: ...
Topic: TR909 snare planning
Electric Druid Replies: 22 Views: 10619	Posted: Thu Jan 16, 2020 8:31 am Subject: TR909 snare planning Forum: DIY Hardware and Software » Developers' Corner
Electric Druid Replies: 22 Views: 10619	This noise PIC project i could spend a whole year, i still dont have perfect noise without glitches. Whether you get glitches depends on the sequence. Not all feedback bit positions produce maxim ...
Topic: TR909 snare planning
Electric Druid Replies: 22 Views: 10619	Posted: Wed Jan 15, 2020 2:36 pm Subject: TR909 snare planning Forum: DIY Hardware and Software » Developers' Corner
Electric Druid Replies: 22 Views: 10619	It looks pretty efficient to me (at least for C!). The only way you'd manage to get that to go faster would be to have a look at what it compiles into, and then see if altering things makes the res ...
Topic: TR909 snare planning
Electric Druid Replies: 22 Views: 10619	Posted: Sat Jan 11, 2020 1:48 pm Subject: TR909 snare planning Forum: DIY Hardware and Software » Developers' Corner
Electric Druid Replies: 22 Views: 10619	With the chip running at 8MHz, you've only got a 2MHz instruction cycle, so that doesn't give you much time. Say we're aiming for 100KHz output rate - that's only twenty instructions. Still, for a bas ...
Topic: TR909 snare planning
Electric Druid Replies: 22 Views: 10619	Posted: Sat Dec 21, 2019 10:51 am Subject: TR909 snare planning Forum: DIY Hardware and Software » Developers' Corner
Electric Druid Replies: 22 Views: 10619	Nice, so the noise has 1 bit output. I did not thought this, i was thinking analog with a DAC. It is a bit weird, but you can think of it as a 1-bit DAC! It's the average level over time that va ...
Topic: TR909 snare planning
Electric Druid Replies: 22 Views: 10619	Posted: Sat Dec 21, 2019 10:32 am Subject: TR909 snare planning Forum: DIY Hardware and Software » Developers' Corner
Electric Druid Replies: 22 Views: 10619	How does the original circuit output the noise on what bitrate ? It's a series of on/off digital bits coming out of pin 9 of IC33. The register is clocked at ~300KHz, so the bits come out at th ...
Topic: TR909 snare planning
Electric Druid Replies: 22 Views: 10619	Posted: Sat Dec 21, 2019 8:45 am Subject: TR909 snare planning Forum: DIY Hardware and Software » Developers' Corner
Electric Druid Replies: 22 Views: 10619	Oh you mean to emulate the exact thing ?, sound like a good plan. To me its unknown parts, i dont know how it works. Fair enough. No reason why you should! The TR-909 noise generator is a hardwa ...
Topic: TR909 snare planning
Electric Druid Replies: 22 Views: 10619	Posted: Fri Dec 20, 2019 2:10 pm Subject: Re: TR909 snare planning Subject description: TR909 snare planning Forum: DIY Hardware and Software » Developers' Corner
Electric Druid Replies: 22 Views: 10619	Hi, i want to build a TR909 snare next year. I dont want to use a MCU for the digital noise, i like to clone the original. Given that the original uses a 32-stage shift-register based noise gene ...
Topic: Using Arduino to "linearize" a vactrol
Electric Druid Replies: 22 Views: 16793	Posted: Fri Dec 20, 2019 4:52 am Subject: Using Arduino to "linearize" a vactrol Forum: DIY Hardware and Software » Arduino
Electric Druid Replies: 22 Views: 16793	My remark about filtering was because a lot of pwm led control uses 50Hz as base frequency, and I'm (almost) sure that 50Hz will give a severe hum at the LDR side of the vactrol. Depends how slow ...
Topic: Using Arduino to "linearize" a vactrol
Electric Druid Replies: 22 Views: 16793	Posted: Thu Dec 19, 2019 4:52 pm Subject: Using Arduino to "linearize" a vactrol Forum: DIY Hardware and Software » Arduino
Electric Druid Replies: 22 Views: 16793	If you're using the PWM to drive a Vactrol's LED, you don't need any filtering. In fact, you're definitely better off without it. You said in [url=https://audiodiwhy.blogspot.com/2019/12/taming-vactro ...
Topic: Poly synth VCF trimmers
Electric Druid Replies: 14 Views: 9351	Posted: Wed Oct 16, 2019 10:01 am Subject: Poly synth VCF trimmers Forum: DIY Hardware and Software » Developers' Corner
Electric Druid Replies: 14 Views: 9351	It is something i dont understand. LSB is for bits, not ohm ? Yes. LSB is "least significant bit". The accuracy and/or linearity of a DAC is usually specified in terms of its smallest ...
Topic: Poly synth VCF trimmers
Electric Druid Replies: 14 Views: 9351	Posted: Wed Oct 16, 2019 7:48 am Subject: Poly synth VCF trimmers Forum: DIY Hardware and Software » Developers' Corner
Electric Druid Replies: 14 Views: 9351	I found it : the absolute tolerance of these resistors is typically ±20% That is a very false sounding synth. No, that's a mis-reading of the datasheet. +/-0.5 LSB is more like it. The syn ...
Topic: Poly synth VCF trimmers
Electric Druid Replies: 14 Views: 9351	Posted: Wed Oct 16, 2019 2:21 am Subject: Poly synth VCF trimmers Forum: DIY Hardware and Software » Developers' Corner
Electric Druid Replies: 14 Views: 9351	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 ...