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| Page 1 of 2 [39 Posts] | Goto page: 1, 2 Next |
| Author | Message |
|---|---|
 Topic: LM13700 OTA with Opamps instead of on-chip darlingtons |
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| KammutierSpule Replies: 3 Views: 4727 |
Posted: Sat Feb 01, 2020 3:46 pm Subject:
LM13700 OTA with Opamps instead of on-chip darlingtons
Subject description: why? Forum: DIY Hardware and Software » Developers' Corner |
| I have seen some designed using the LM13700 OTA that instead of using their on-chip darlington, they use an external Opamp to the effect.
What they are trying to solve by using Opamps? |
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| Topic: Mixing analog voices: DC or AC ? |
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| KammutierSpule Replies: 12 Views: 6210 |
Posted: Tue Jan 28, 2020 3:11 am Subject:
Mixing analog voices: DC or AC ?
Forum: DIY Hardware and Software » Developers' Corner |
| Thanks is makes sense!
Another related basic question. While summing all OSCs / or Voices, at some pointing it is possible that it starts clipping / saturate the values. I believe the correct ... |
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| Topic: Mixing analog voices: DC or AC ? |
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| KammutierSpule Replies: 12 Views: 6210 |
Posted: Sun Jan 19, 2020 2:32 pm Subject:
Mixing analog voices: DC or AC ?
Forum: DIY Hardware and Software » Developers' Corner |
| Let me clarify my question. There are two scenarios:
- On a voice, how do you mix the OSC? Eg: you have a Square Osc, sub-Square Osc, etc how do you sum it? in DC or AC? - How do you mix multip ... |
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| Topic: Mixing analog voices: DC or AC ? |
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| KammutierSpule Replies: 12 Views: 6210 |
Posted: Fri Jan 10, 2020 1:43 pm Subject:
Mixing analog voices: DC or AC ?
Forum: DIY Hardware and Software » Developers' Corner |
| Most of the schematics mixers I see are mixing with DC ( a resistor divisor and then a buffer) but, does it makes sense to mix voices in AC, removing any of the offset ? | |
| Topic: software filter: non fixed sampling rate filter |
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| KammutierSpule Replies: 22 Views: 14356 |
Posted: Thu Feb 23, 2017 5:22 pm Subject:
software filter: non fixed sampling rate filter
Forum: DIY Hardware and Software » Developers' Corner |
|
I think this is really a non-issue that is being blown out of proportion due to a lack of understanding of DSP fundamentals. As long as your Fs is suitable for the signal you're trying to reprodu ... |
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| Topic: software filter: non fixed sampling rate filter |
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| KammutierSpule Replies: 22 Views: 14356 |
Posted: Thu Feb 23, 2017 1:12 pm Subject:
software filter: non fixed sampling rate filter
Forum: DIY Hardware and Software » Developers' Corner |
| I am also not sure about my ideas, they may don't make sense but thats why I am discuss it here with someone more expert on the subject!
I may will abandon this idea, but I'm just happy to discuss ... |
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| Topic: software filter: non fixed sampling rate filter |
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| KammutierSpule Replies: 22 Views: 14356 |
Posted: Thu Feb 23, 2017 12:34 pm Subject:
software filter: non fixed sampling rate filter
Forum: DIY Hardware and Software » Developers' Corner |
| Sorry but if that is the same interpolation I know, it is not interpolation I am looking for..
What I know of interpolation mean is: calculate an estimation of some value between two (or more) know v ... |
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| Topic: software filter: non fixed sampling rate filter |
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| KammutierSpule Replies: 22 Views: 14356 |
Posted: Thu Feb 23, 2017 12:03 pm Subject:
software filter: non fixed sampling rate filter
Forum: DIY Hardware and Software » Developers' Corner |
| When I think of sample rate, I think of the rate at which the DAC is updated which is normally fixed.
No actually I am planing the output to be fixed rate, but the internal calculations (lets say.. ... |
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| Topic: software filter: non fixed sampling rate filter |
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| KammutierSpule Replies: 22 Views: 14356 |
Posted: Thu Feb 23, 2017 11:59 am Subject:
software filter: non fixed sampling rate filter
Forum: DIY Hardware and Software » Developers' Corner |
| I dont much about processing so I dont know how this is called.
I will explain again. consider you have the triangle wave: at t time, the tri wave, it will be at one voltage level (some intensit ... |
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| Topic: software filter: non fixed sampling rate filter |
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| KammutierSpule Replies: 22 Views: 14356 |
Posted: Thu Feb 23, 2017 9:04 am Subject:
software filter: non fixed sampling rate filter
Forum: DIY Hardware and Software » Developers' Corner |
| Can you tell us why you want to do this? What could you do with such a filter that you believe you cannot do with a fixed sample rate filter?
I was evaluating to simulate an analogue circuit ... ... |
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| Topic: software filter: non fixed sampling rate filter |
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| KammutierSpule Replies: 22 Views: 14356 |
Posted: Thu Feb 23, 2017 6:00 am Subject:
software filter: non fixed sampling rate filter
Forum: DIY Hardware and Software » Developers' Corner |
| true but.. My questions was not related with the general code implementation but with the filter design and concerns?
As the filters work as an incremental processing (i.e: the result depends on th ... |
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| Topic: software filter: non fixed sampling rate filter |
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| KammutierSpule Replies: 22 Views: 14356 |
Posted: Thu Feb 23, 2017 4:28 am Subject:
software filter: non fixed sampling rate filter
Forum: DIY Hardware and Software » Developers' Corner |
| If I have a regular filter / processing, this will look similar to this:
InitFilter( 1/FS); For each sample { output = ProcessFilter(new sample); } What I am l ... |
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| Topic: software filter: non fixed sampling rate filter |
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| KammutierSpule Replies: 22 Views: 14356 |
Posted: Thu Feb 23, 2017 2:29 am Subject:
software filter: non fixed sampling rate filter
Forum: DIY Hardware and Software » Developers' Corner |
| Most (all?) of the software filters implementation are based on a fixed (pre calculated parameters) sample rate.
I was looking some source code, some filters pre calculate the 1/FS to it will be us ... |
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| Topic: THT DIY vs SMD |
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| KammutierSpule Replies: 5 Views: 4238 |
Posted: Mon Nov 30, 2015 11:00 am Subject:
THT DIY vs SMD
Forum: DIY Hardware and Software » Developers' Corner |
| Thanks for your comments.
But, I was wondering if there is any reason from the point of view of a user that have preference for equipment using THT (or that they build/solder their DIY) instead of ... |
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| Topic: THT DIY vs SMD |
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| KammutierSpule Replies: 5 Views: 4238 |
Posted: Mon Nov 30, 2015 5:49 am Subject:
THT DIY vs SMD
Forum: DIY Hardware and Software » Developers' Corner |
| Hello all,
is there any reason that we see more designs using THT (through the hole) components to be solder as a DIY kit vs using SMD (surface mounted devices) components already solder? Does u ... |
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| Topic: Designs licenses |
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| KammutierSpule Replies: 0 Views: 2099 |
Posted: Thu Nov 19, 2015 7:31 am Subject:
 Designs licenses
Forum: DIY Hardware and Software » Developers' Corner |
| Hello all,
I am wondering if I would like to make a commercial 'analog diy' synth project, what care should I have with design licenses while you are design your circuit? Eg: If I want to use some ... |
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| Topic: 32 K byte SPI SRAM |
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| KammutierSpule Replies: 44 Views: 52641 |
Posted: Thu Aug 30, 2012 1:07 pm Subject:
32 K byte SPI SRAM
Forum: DIY Hardware and Software » Microcontrollers and Programmable Logic |
| I found now that microchip have new sizes:
http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=2698 512Kbits and 1024Kbits but is still hard to get in the normal dealers.. ... |
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| Topic: 32 K byte SPI SRAM |
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| KammutierSpule Replies: 44 Views: 52641 |
Posted: Thu Aug 30, 2012 9:49 am Subject:
32 K byte SPI SRAM
Forum: DIY Hardware and Software » Microcontrollers and Programmable Logic |
| Hi
I was also looking for some type of volatile ram that use few pins. I was looking for this SPI ram from microchip, but the size/price ratio is bad.. for almost the same price is possible to get a ... |
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| Topic: First synth design brainstorm.. |
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| KammutierSpule Replies: 10 Views: 12044 |
Posted: Fri Feb 26, 2010 4:40 am Subject:
First synth design brainstorm..
Forum: DIY Hardware and Software » Developers' Corner |
| There is some of my ideas to help in your brainstorming:
http://electro-music.com/forum/topic-30501.html http://electro-music.com/forum/topic-23758.html for LFO and other stuff you dont need so ... |
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| Topic: holtek music MCUs |
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| KammutierSpule Replies: 1 Views: 3465 |
Posted: Tue Jul 14, 2009 3:12 am Subject:
holtek music MCUs
Forum: DIY Hardware and Software » Microcontrollers and Programmable Logic |
| I found this company that have some possible interesting MCU for sound related products. I dont know much what are they used for (some for phone systems or something..)
Take a look: http://www.h ... |
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| Topic: dsPIC Project Boards |
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| KammutierSpule Replies: 2 Views: 5902 |
Posted: Mon Jan 12, 2009 3:08 am Subject:
dsPIC Project Boards
Forum: DIY Hardware and Software » Microcontrollers and Programmable Logic |
| Hi Inventor!
I've checked you webpage and I didn't understand in what way that should work as a synthesizer. What I see seams to be a ADC in 4 channels, and 4 output PWM. I dont know about Chuck ... |
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| Topic: Anyone PulseDensityModulation/DirectStreamDigital? |
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| KammutierSpule Replies: 19 Views: 17527 |
Posted: Sat Nov 29, 2008 11:16 am Subject:
Anyone PulseDensityModulation/DirectStreamDigital?
Forum: DIY Hardware and Software » Microcontrollers and Programmable Logic |
Ah, you have a DSD input signal. 
Let's see... DSD bit rate = 44.1 ksamp/sec * 64 * 1 bit/samp = 2.8224 Mbit/sec PCM (16-bit) rate = 44.1 ksamp/sec * 16 bit/sample = 705.6 kbit/sec PCM (24-b ... |
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| Topic: Anyone PulseDensityModulation/DirectStreamDigital? |
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| KammutierSpule Replies: 19 Views: 17527 |
Posted: Sat Nov 29, 2008 5:49 am Subject:
Anyone PulseDensityModulation/DirectStreamDigital?
Forum: DIY Hardware and Software » Microcontrollers and Programmable Logic |
| I think you may have some better luck researching sigma delta DACs rather than pure DSD which works best if the source signal is a 1 bit stream (like SACD).
But.. I can have a DSD source signal too ... |
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| Topic: Anyone PulseDensityModulation/DirectStreamDigital? |
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| KammutierSpule Replies: 19 Views: 17527 |
Posted: Thu Nov 27, 2008 8:03 pm Subject:
Anyone PulseDensityModulation/DirectStreamDigital?
Forum: DIY Hardware and Software » Microcontrollers and Programmable Logic |
| Ah I see the difference now... so cursor 2 is showing the pulses, more pulses = higher analog value.
Well.. yes.. and no.. yes pulses.. or not.. I dont know what call it, but in this case pulses ar ... |
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| Topic: Anyone PulseDensityModulation/DirectStreamDigital? |
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| KammutierSpule Replies: 19 Views: 17527 |
Posted: Thu Nov 27, 2008 6:41 pm Subject:
Anyone PulseDensityModulation/DirectStreamDigital?
Forum: DIY Hardware and Software » Microcontrollers and Programmable Logic |
| So what I think you are attemping is Pulse Width Modulation (= pulse density modulation)
No, as far as I can understand is total diferent. PWM is diferent of PDM PWM is as you describe: ie Aver ... |
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