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    Pixel (Teensy Pixie) SDR

    Idea: incorporate the novel concept of the classic pixie design with a modern take, and make it an sdr front end. For those of you unfamiliar with the pixie, here's a schematic.

    21357

    The...
  2. Look at the example "WS2812Serial." I believe if...

    Look at the example "WS2812Serial." I believe if you work out the time constants that library alone may allow you to do DCC. Just think of each "RGB" pixel as a one byte value for your railroad...
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    Whitebengal, no offense but you pretty much just...

    Whitebengal, no offense but you pretty much just described the rpi. To me the teensy is just what it says - teensy. If I want internet, bluetooth or that other stuff I'll just use a pi, it's almost...
  4. This is an almost perfect application of the...

    This is an almost perfect application of the ws2812 drivers. You could control up to 8 sections of track with one teensy.
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    What you need is a peak detector. This is being...

    What you need is a peak detector. This is being brought into the audio library but isn't yet released (SFAIK). It's a full wave rectifier which, combined with a tunable lowpass filter gives you...
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    If you;re looking for a pulse in synch with your...

    If you;re looking for a pulse in synch with your waveform and your wave will have very low frequencies, you can use MQS and get great S/N at <100Hz with the right lowpass filter on the appropriate...
  7. Why not use 4 8 bit shift registers to dma clock...

    Why not use 4 8 bit shift registers to dma clock the input from your A/D convertors through the SPI port?
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    https://www.youtube.com/watch?v=P8MpZGjwgR0

    https://www.youtube.com/watch?v=P8MpZGjwgR0
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    No, star grounding and copper fill are NOT...

    No, star grounding and copper fill are NOT exclusive in any way. They work together.

    Every connection is a signal from the pin, through the input, back via ground. Every switching signal between...
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    The important part to remember is to not pull any...

    The important part to remember is to not pull any current through the AC ground. Your digital and your analog grounds should be completely separate except for ONE PLACE where they meet directly with...
  11. No. No Teensy can output audio at 192x sample...

    No. No Teensy can output audio at 192x sample rate. That's what codecs are for. What you are talking about is sampling a signal changing 192 times 44100 times per second. That's several MHZ and...
  12. I think this is what midi is for. If what you are...

    I think this is what midi is for. If what you are needing is a lot of dacs, a 16 channel 12 bit pwm driver is two bucks. If what you want is 192 channels being updated at audio sample rates, I can...
  13. What about supporting naming conventions like...

    What about supporting naming conventions like osc[1], adsr[4], etc? Presently a copy and paste of such names results in a mess like osc[1]1, adsr[4]1, etc.
  14. This is why you get paid the bucks. Thanks! When...

    This is why you get paid the bucks. Thanks! When will it show up in the gui?
  15. Interesting. I see your point, but the api seems...

    Interesting. I see your point, but the api seems to be doing the heavy lifting because it works as specified. Here's a proof.

    #include <Audio.h>
    #include <Wire.h>
    #include <SPI.h>
    #include...
  16. Can we delete attachments? I now have two of...

    Can we delete attachments? I now have two of effect_rectifier.cpp files in my attachments manager.

    Anyway, this one is elegant and works great.
  17. And here's an updated c module minus the bug...

    And here's an updated c module minus the bug pointed out by el_supremo
  18. Scratch that, that's a weeks old file. Here's a...

    Scratch that, that's a weeks old file. Here's a basic demo that uses a built in noise source to get things started.
  19. I'd be flattered if you would merge it into the...

    I'd be flattered if you would merge it into the library. It would save me having to edit my copy and paste code from the gui to make my own rectifier links.

    Here's a vocoder I made based on...
  20. Best way to get started is to delve into the...

    Best way to get started is to delve into the library and learn how the existing things work. The osc you describe could just be the existing osc with some added control inputs.

    Here's a really...
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    You have to reset the codec and configure it...

    You have to reset the codec and configure it after the teensy has been reset. Did you connect a pin on the teensy to control the codec reset?
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    Very cool. You can also generate a 650MHz to...

    Very cool. You can also generate a 650MHz to 1.3GHz clock (tunable in 1hz increments) right on the teensy using pll5 and bring it to pin 13 through programmable prescalers up to 166MHz

    I'm still...
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    Thanks. Now I am having a problem with my new...

    Thanks. Now I am having a problem with my new 4.1. When I attempt to download a sketch that works on my 4.0, my system tells me

    Teensy did not respond to a USB-based request to enter program...
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    In the designer tool you can declare names like...

    In the designer tool you can declare names like mixer[1] instead of mixer1, mixer2, etc. The design tool still sucks for this when copying and pasting, requiring you to manually go back and change...
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    problems in ubuntu

    Teensy has been very flaky in my system. Tonight Arduino IDE stopped working completely until I deleted my .15-arduino user folder. Then it appeared my installation had lost all Teensy libraries and...
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    OK, so basically just putting everything into...

    OK, so basically just putting everything into brackets to make it part of an array?

    AudioSynthWavetable wavetable15;

    becomes

    AudioSynthWavetable wavetable[15];

    Makes sense. I...
  27. Have you tried this? Most 5v logic can be...

    Have you tried this? Most 5v logic can be triggered to a one at about 2.3 Volts. Your board should "just work." This sounds more like wiring error. Inputs should not present voltage back to the...
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    sample rate control signals

    Based on your sketch, I've rebuilt a demo of a vocoder that incorporates a new effects module I hacked together: Rectifier. This acts as a full wave rectifier on the audio signal, outputting a signal...
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    So what was the resolution to the clicking? Was...

    So what was the resolution to the clicking? Was it a bug you fixed, hardware failure, bad solder joint? Does the sketch you posted work now?

    I'll be looking forward to your modulated wavetable...
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    What I have found is a PLL dedicated to video,...

    What I have found is a PLL dedicated to video, which I am hoping to find out is not used by the Teensy audio library. That PLL can be adjusted in 1hz increments from 650 to 1300MHz and then routed...
  31. Your shunts are all wired in parallel to 48V and...

    Your shunts are all wired in parallel to 48V and GND. Shunts go in series with the load. I'm not familiar with the chips, but your schematic shows 4 shunt resistors shorting out 48V to GND.
  32. I'm also curious: why 88? Is it because a piano...

    I'm also curious: why 88? Is it because a piano has 88? There are an infinite number of notes, why be arbitrary? You only have two hands and maybe 11 or twelve fingers at best. Just curious.
  33. You can't convert a square wave to triangle over...

    You can't convert a square wave to triangle over a ten octave range using a simple integrator - you need a tracking filter for that. Your two square waves mixed down represent basically three states:...
  34. So do you really need the mad scientist stuff of...

    So do you really need the mad scientist stuff of having 88 knobs and 88 channels all playing tones at once? If that's the point then I get it, but for all that you really need only about three or...
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    I looked at the datasheet and downloaded it, and...

    I looked at the datasheet and downloaded it, and in the part about controlling the SPI clock it says "look in the chip specific document." I thought that WAS the "chip specific document?"

    My goal...
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    Pixel (Teensy Pixie) SDR

    I've been mucking around plans to produce a Teensy SDR shield of the most basic design. One stumbling block has been finding a clock source. I'm hoping to make use of the SPI clock as a carrier...
  37. The Teensy 4.1 with a pair of audio shields...

    The Teensy 4.1 with a pair of audio shields should be able to perform the same as the Tsunami, but the libraries need time to catch up to the new capabilities. If you don't need 4 stereo outputs,...
  38. If it is a cluster of Teensies handling 88 notes,...

    If it is a cluster of Teensies handling 88 notes, does every note handler need to know every note being handled by every other note handler? IOW, what you are describing is a problem where you might...
  39. I've been experimenting with the Teensy since, I...

    I've been experimenting with the Teensy since, I believe, T2 or so? Rpi I only had zeroes and a 3, but an 8GB pi4 is one of my next planned purchases. The teensy can do USB audio out and midi i/o, so...
  40. I hope this isn't un-PC here to say this, but if...

    I hope this isn't un-PC here to say this, but if you need 8 tracks, stereo, and 1000 files and are trying to network 4 teensies to do the job, wouldn't you simply be better off with a pi4? Then you...
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    Darn. If only M. Schultz were still around to lay...

    Darn. If only M. Schultz were still around to lay out pc boards. Sadly, the Snoopy dog house technology passed with him.

    Sure would be nice to have an 8MB 4.0 tho.
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    I understand the 4.1 has all that coolness, but...

    I understand the 4.1 has all that coolness, but all I'm really talking about is replacing the existing 2MB chip with the 8MB from the 4.1. Nothing more. The 4.1 is loaded with features, but for some...
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    That fits fine on the audio board, right? I was...

    That fits fine on the audio board, right? I was speaking of having 8MB of flash instead of 2 in the smaller size. Thus, Teensy 4.08.
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    I don't know about next generation, but in this...

    I don't know about next generation, but in this generation it would be really great if one could buy a teensy 4.0 with the 8MB the 4.1 has. Maybe call it the Teensy 4.08.
  45. Your chip is rated for 6V max poower, and you...

    Your chip is rated for 6V max poower, and you have a 9V battery. Already not good news.

    Your amp is an op-amp, not a power amp. It needs gain and feedback resistors in order to set closed loop...
  46. By the way, you CAN solder that chip with a...

    By the way, you CAN solder that chip with a soldering iron and flux and solder remover tape. There are also videos showing how to do it. I'd built my own surface mount boards using cardstock and fine...
  47. Buy an audio board, a heat gun kit, flux and...

    Buy an audio board, a heat gun kit, flux and solder paste, and practice "repairing" the chip. Or you could make your own boards and buy a few chips. I think the key is learning to use the heat gun...
  48. Given the results I have had so far doing this...

    Given the results I have had so far doing this using recordings of instruments from youtube, that's pretty amazing performance. Will you be offering the synth for sale or sharing the sketches?
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