[sdiy] Drum sample playback

Thu Apr 13 21:58:14 CEST 2017

Thanks Everyone!  I had fun with this one :)

Matthias, yes it has an internal pull up that can be activated via
software, so you can just short the inputs to ground.

Neil, I don't know about the midi output, actually! I didn't plan on using
it so I left in disconnected.

Tom, I had the discussion about the diode in the FB SDIY group, and some
people mentioned it, others said it wasn't needed, so i made it this way to
save space on the board. It seems to be working fine, even if I send it big
raunchy bipolar LFOs :)

Tony, I'm not an engineer, and it's not 1970, seriously, textbooks? ;)   I
learn a lot by finding what exists, what people have been doing that works,
then trying to understand why it works and how to implement it into what
I'm doing.

I think the Next video is gonna be fun. I might have invented (discovered)
a ringmod/bipolar VCA/waveshaper made with just 3 components and no power
other than CV :)

Cheers!

Q

On Thu, Apr 13, 2017 at 2:25 PM, Tony K <weplar at gmail.com> wrote:

> Nice work Quincas.
>
> You remind me of the old manic me in my younger days *sigh* (wAtch out for
> Burn Out- and I don't mean the Tsunami board ;)
>
> Correct me if I am wrong, but did you say you "found" that transistor
> switch circuit ? tsk tsk, What fun is there in that? Pull out a text book
> and design one,  don't be lazy and pinch one from a schematic. ;) Ah you
> young whipper-snappers always in a hurry .
>
> Keep up the nice work,
>
> Cheers,
>
> Tony K
>
>
>
>
> On Apr 13, 2017, at 11:17 AM, Mike HEQX <mike at heqx.com> wrote:
>
> So freaking cool. It has been on my list for a while. I need to step up my
> game.
>
> On 4/13/2017 2:46 AM, Quincas Moreira wrote:
>
> Hey! So, I got asked by Sparkfun to do a video for the Tsunami, so I went
> ahead and made a module with it! It's indeed an awesome little board, check
> it out:
> https://youtu.be/wulg6GZj6oE
> Best
> Q
>
>
>
> On Sat, Feb 18, 2017 at 12:12 PM, <paula at synth.net> wrote:
>
>> Quincas,
>>
>>  Would love to help, but at the moment I can't due to legalities.
>> If someone does make one, I'd be very interested (depending on spec).
>>
>> Paula
>>
>>
>> On 2017-02-18 15:13, Quincas Moreira wrote:
>>
>>> very cool! Let's make a Euro panel for it, who's game?
>>>
>>> It does another thing that VST/Au cannot...  Function without a host
>>> computer :)
>>>
>>> On Sat, Feb 18, 2017 at 5:46 AM, Matthias Puech
>>> <matthias.puech at gmail.com> wrote:
>>>
>>> Hi,
>>>>
>>>> Yes, it looks like an interesting little board. What is that
>>>> impressive though?
>>>> I didn't know about this particular codec, it could be handy in a
>>>> module design. Now if I put aside SDIO throughput (which I don't
>>>> know much about), it doesn't seem that surprising to be able to read
>>>> 32 samples at the same time. We can already achieve 32+ linearly
>>>> interpolated voices on an STM32F4 (Cortex-M4 @ 200MHz) at 48kHz, and
>>>> the M7 has far better performance (300MHz, better FPU) so there
>>>> should be room for better interpolation (or more polyphony). Am I
>>>> missing something?
>>>>
>>>> Best,
>>>> -m
>>>>
>>>> On Fri, Feb 17, 2017 at 11:45 PM, Richie Burnett
>>>> <rburnett at richieburnett.co.uk> wrote:
>>>>
>>>> That's impressive!
>>>>>
>>>>> It's usually the resampling that takes the majority of CPU cycles
>>>>> with sample playback. So for a given amount of CPU power you can
>>>>> either have tons of voices that alias like hell when you transpose
>>>>> the samples or a quarter of those voices with nice clean detuning
>>>>> of the samples. I suspect this is where they might have cut
>>>>> corners.
>>>>>
>>>>> Of course if you want to pitch up a Hi-hat sample and the playback
>>>>> module has crap resampling, then there's nothing to stop you
>>>>> transposing the sample in a decent audio processing package first
>>>>> before sticking it on the sd card.  (That's what I used to do with
>>>>> my old Akai S01 sampler that had crappy linear interpolation, and
>>>>> turned hi-hat samples into rustling paper bag sounds as soon as
>>>>> you touched the transpose control!)
>>>>>
>>>>> -Richie,
>>>>>
>>>>> Sent from my Xperia SP on O2
>>>>>
>>>>> ---- paula at synth.net wrote ----
>>>>>
>>>>> OMG,
>>>>>>
>>>>>> anyone seen this?
>>>>>>
>>>>>> https://www.sparkfun.com/products/13810 [1]
>>>>>>
>>>>>> upto 32 samples playing back at the same time, built in MIDI, 8
>>>>>>
>>>>> outputs
>>>>>
>>>>>> which can dynamically assign. Just WOAH
>>>>>>
>>>>>> Paula
>>>>>> _______________________________________________
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>>>>>>
>>>>>
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>>>
>>> --
>>> Quincas Moreira
>>> Test Pilot at VBrazil Modular
>>>
>>> Links:
>>> ------
>>> [1] https://www.sparkfun.com/products/13810
>>> [2] http://synth-diy.org/mailman/listinfo/synth-diy
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>>
>
>
> --
> Quincas Moreira
> Test Pilot at VBrazil Modular
>
>
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-- 
Quincas Moreira
Test Pilot at VBrazil Modular
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