[AudioI] AudioInjector and Guitar
Matt Flax
matt at audioinjector.net
Mon Feb 21 02:12:00 UTC 2022
Each use case is slightly different, however I think people want a low
latency input from an instrument. Then to process the instrument in
software and finally output the signal.
I guess you could think of it as an inline effects unit.
Typically the aim is to keep the audio processing latency well below 10
ms - otherwise the delay is perceivable to the performer.
Matt
On 21/2/22 12:07, JONATHAN RIZZO via People wrote:
> Hi All,
>
> I’m just curious, what are these guitar projects for? Is the Pi being used to record these signals?
>
> The reason I ask is because I use Matt’s products for very low frequency radio signals.
>
> Thanks
>
> Jonathan
>
>> On Feb 20, 2022, at 6:28 PM, Joseph DiVerdi via People <people at lists.audioinjector.net> wrote:
>>
>> Similarly, I can mention https://www.muzique.com/ which is a pretty broad and perhaps a bit cluttered assortment of the electronic side of electronic musical instruments (broadly defined). It is but one of a number of sites like it which vacillate between home-builders and buyers. Many are pretty old (both the site and the author). This analog stuff enjoyed a real lift-off (if that is the proper term) starting in the late 1960s with a heyday in the 1970s. j
>>
>>> On Sun, 20 Feb 2022 4:19 PM, hugh crawford wrote:
>>> Forgot to mention this
>>> https://www.guitarfetish.com/Neovin-Active-PreampEQ_c_147.html <https://www.guitarfetish.com/Neovin-Active-PreampEQ_c_147.html>
>>> The guitarfetish site is sort of an uninformative mess, but Googling the products will turn up their old more descriptive web pages.
>>> On Sun, Feb 20, 2022 at 2:59 PM Joseph DiVerdi <diverdi at xtrsystems.com <mailto:diverdi at xtrsystems.com>> wrote:
>>> I have some of this kind of work on my website. Here is an example of an amplifier (and much more) I installed in a bass guitar including (relevant to this discussion) a pickup amplifier and final low impedance output buffer which is capable of driving looong cable lengths with high fidelity. The guitar details can be found at <http://xtrsystems.com/music/20201222%20bass%20guitar/20201222%20bass%20guitar.pdf <http://xtrsystems.com/music/20201222%20bass%20guitar/20201222%20bass%20guitar.pdf>> Other relevant items (including my planned installation of a Ultra audio-injector (another of Matt's fine products) and a raspberry-pi into a big amplifier and speaker system. One possibility for this is a Sonic-Pi application for synthesizer. Another is for looping. Big goals, limited time to work on them.
>>> The guitar electronics were intentionally designed to operate on a single (9V) battery knowing full well there would be some power on/off transients (clicks). This was a prototype project (perhaps "throw away"). Two batteries would help or a negative rail DC generator. One of the helpful aspects is that the line voltage output is so high that I had to construct an in-line 10x attenuator that sits at the amplifier input (helping control line impedance and minimizing frequency roll-off, reducing line noise and the on/off transients).
>>> I'm happy to discuss electronic circuit design in this context or others. I have been doing this stuff for many years and enjoy sharing the experiences.
>>> Joseph
>>> On Sun, 20 Feb 2022 3:42 PM, Matt Flax via People wrote:
>>> > *** Caution: EXTERNAL Sender ***
>>> >
>>> > Do you know any circuits online of guitar preamps which are known good ?
>>> >
>>> > One idea is to design one up - possibly using the Pro soundcard first - because of its available power rails and low noise design and the AIABS inteface which would make it reusable.
>>> >
>>> > We could work through the design of a preamp there seems to be some interest.
>>> >
>>> > Matt
>>> >
>>> > On 21/2/22 09:37, hugh crawford wrote:
>>> >> I was really excited to see this because I thought maybe somebody had figured it out. Imagine my disappointment to see that it was pointing back to me. I have not actually figured this out. I am dealing with six extremely low power output single coil pickups and the noise is six times worse than one would get from a regular setup so it’s sort of worst case scenario here.
>>> >>
>>> >> I am also building the actual guitar so I have been occupied with a multitude of other problems.
>>> >>
>>> >> Some ideas that I am considering but have not yet tried are to run the guitar signal through some sort of effects box, a booster for instance, that will do impedance matching and deliver a more useful signal to the audioinjector.
>>> >>
>>> >> In my case I’m thinking of trying six cheapish noise gates since hardly ever am I playing all six strings at once.
>>> >>
>>> >> Another idea involves using a high impedance Phono preamp as a buffer.
>>> >>
>>> >> My advice would be to build your device, then if necessary visit your friendly guitar store and try out different stomp boxes as buffers. That’s what I plan to do soon now that they are open to in person business.
>>> >>
>>> >> On Sun, Feb 20, 2022 at 1:46 PM Matt Flax via People <people at lists.audioinjector.net <mailto:people at lists.audioinjector.net>> wrote:
>>> >>
>>> >> Hi Harold,
>>> >>
>>> >>
>>> >> Some people in the past have build guitar rigs, there is most likely good information here :
>>> >>
>>> >> https://lists.audioinjector.net/pipermail/people/2020-December/000157.html <https://lists.audioinjector.net/pipermail/people/2020-December/000157.html>
>>> >>
>>> >> http://forum.audioinjector.net/viewtopic.php@t=5797.html <http://forum.audioinjector.net/viewtopic.php@t=5797.html>
>>> >>
>>> >>
>>> >> You can also contact those people directly if you don't get a response here.
>>> >>
>>> >>
>>> >>
>>> >> Matt
>>> >>
>>> >>
>>> >> On 20/2/22 07:02, Harold Désert-Legendre via People wrote:
>>> >>> Hello Audioinjector Users,
>>> >>>
>>> >>> I bought the audioinjector soundcard (stereo in/out via rca connectors) in order to build a guitar looper pedal. Will I need to adjust the guitar signal in term of gain? Or Can I directly plug the guitar into the soundcard (just physically transforming jack into rca).
>>> >>>
>>> >>> If anyone has experience with it, thanks for sharing your feedbacks!
>>> >>>
>>> >>> Regards,
>>> >>>
>>> >>> Harold
>>> >>>
>>> >> --
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>>> >> https://lists.audioinjector.net/mailman/listinfo/people <https://lists.audioinjector.net/mailman/listinfo/people>
>>> >>
>>> >>
>>> >> --
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>>> >>
>>> > --
>>> > Checkout the community email list :
>>> > https://lists.audioinjector.net/mailman/listinfo/people <https://lists.audioinjector.net/mailman/listinfo/people>
>>> >
>>> >
>>> >
>>> -- Joseph A. DiVerdi, PhD, MBA
>>> XTR Systems, LLC
>>> ChemIntelligence for Hemp & Cannabis
>>> +1.970.980.5868 - www.xtrsystems.com/ <http://www.xtrsystems.com/>
>>> us02web.zoom.us/j/9460709393 <http://us02web.zoom.us/j/9460709393>
>>
>> --
>> Joseph A. DiVerdi, PhD, MBA
>> XTR Systems, LLC
>> ChemIntelligence for Hemp & Cannabis
>> +1.970.980.5868 - www.xtrsystems.com/
>> us02web.zoom.us/j/9460709393
>>
>> --
>> People mailing list
>> People at lists.audioinjector.net
>> https://lists.audioinjector.net/mailman/listinfo/people
>
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