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  1. Replies
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    Yup! That's what I'm planning to do. This thread...

    Yup! That's what I'm planning to do.
    This thread got side tracked a little, but the initial question was how I should plan the circuitry between my 0v~1.2v DAC pin and an audio out jack. Or more...
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    Right.. theres so much I didn't even anticipate!...

    Right.. theres so much I didn't even anticipate!
    Thanks for the recommendation! I'll look into this.

    Thanks always MarkT!
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    Paul, Thanks for the detailed advice! Its a...

    Paul,

    Thanks for the detailed advice! Its a little difficult for me to fully understand but i'll take it as : 'check carefully if both the input and output is rail to rail'. Fortunately, I found...
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    Or if i didn't care about gain amplification, I...

    Or if i didn't care about gain amplification, I could just do this?

    LINK

    i.e. opamp as a buffer (or gain, if i want to i guess) first, and THEN a capacitor. this way I could just use the 3.3v...
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    YupYup. I was gonna use the MCP6002, but im...

    YupYup.
    I was gonna use the MCP6002, but im reconsidering if I want rail to rail or single supply. Why not the LM358? bad quality? I just looked for the AD8656 but it seems to only be as SMD haha Im...
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    Hey, few things. what does this mean? You meant...

    Hey, few things.
    what does this mean? You meant that I removed DC bias with the capacitor so I dont have to worry about it later right?


    Why do I need a 100k resistor to the ground? and where?
    ...
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    Okay i found this : ...

    Okay i found this :

    https://www.eecs.tufts.edu/~dsculley...s/opamps5.html

    I thought I would have to amplify my signal with some complicated setup, but i didn't know about opamp buffer...
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    Okay i found this : ...

    Okay i found this :

    https://www.eecs.tufts.edu/~dsculley/tutorial/opamps/opamps5.html

    I thought I would have to amplify my signal with some complicated setup, but i didn't know about opamp...
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    Right! I wanted to confirm that the amplified...

    Right!
    I wanted to confirm that the amplified output does infact double as line output too. Thanks for clarifying. So I guess thats why i should have to amplify it first - to lower the impedance, I...
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    Hmm! Okay. Thanks! How about those consumer...

    Hmm! Okay. Thanks!
    How about those consumer synthesizers that only has, what it looks to be a headphone out, to be used as the only audio out? like these? It seems to work with earphones and as...
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    oh something to add. Werid thing I noticed is...

    oh something to add.

    Werid thing I noticed is that when I plug my earphones directly to the DAC pin, i could barely hear the signal. But when I connect it to my mixer, its nearly similar to my...
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    How *loud* should my audio out be?

    Short version :
    Im gonna drive an audio out from the onboard DAC. I'm going to use an opamp to drive my signal to a 'commercial standard' of synth line levels. How much max voltage/current/loudness...
  13. Oh yes! thanks for clarifying! Do you mean...

    Oh yes! thanks for clarifying!



    Do you mean like this spike? (0.3v AC with 3v DC offset).

    21434
  14. Hi MarkT, Sorry for bringing this up again, I...

    Hi MarkT,
    Sorry for bringing this up again, I just couldnt find an answer.
    I just have a few questions

    What do you mean by :



    Because the circuit works and gives +0.6v dc offset whether...
  15. Recklessness aside, I do not know.. I was kind of...

    Recklessness aside, I do not know.. I was kind of hoping I someone would give me an idea.
    Do you reckon this would be efficiently possible if I didn't use the audio library?


    Sorry for the late...
  16. Using analogRead and AudioInputAnalog in the Audio Library, is there any workaround?

    I stupidly forgot the part where I cant use analogRead and ADC audio input in Audio Library.

    I'm trying to make an effect processor, that takes in audio, spits audio out, has some knobs, does some...
  17. Audio Library - Output audio through SPI DAC chip.

    Short version :
    Will there ever be a support for outputting audio to DAC chips via SPI?
    How would I write a driver/module that I can use as a module that does such thing?


    Slightly longer...
  18. Hey just a question. Is this circuit making any...

    Hey just a question.
    Is this circuit making any assumptions? i.e. the input audio outputs voltage in the range of ___v?
    I was looking at the circuit and I realised the DC offset wouldnt work if the...
  19. oh wow is this some sort of circuit simulator??...

    oh wow is this some sort of circuit simulator?? this would be very useful!
    Thanks!
  20. This is GOLD. Dont understand much of it except...

    This is GOLD. Dont understand much of it except the input 47k, but this will be a nice starting point. Thank you always MarkT!
    Do you have any suggestions on what I should google regarding this...
  21. Confused with the recommended circuitry for ADC on teensy.

    21294

    Hey. Quite a simple question. I found this on the teensy's Audio Library Design Tool documents.

    I *THINK* this is so that line level inputs are dc-offsetted appropriately so it can be...
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    NICE! Thank you! With your help, I made a pretty...

    NICE!
    Thank you! With your help, I made a pretty little Audio utility board thingi
    21208

    I can connect Pin A14 DAC to a row of diode and 1k resistor to output CV, or use DAC as audio output and...
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    Oh right, sorry I didn't even know what I did was...

    Oh right, sorry I didn't even know what I did was commoning the ground, but I guess it makes sense. But just to clarify, you should not exchange voltages from pins between two seperate systems,...
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    Oh god I am scared. By 'commoning the ground' do...

    Oh god I am scared. By 'commoning the ground' do you mean like what I've done with the empty CV in cable that connected to the ground of teensy? That seems to work when power adaptor isn't connected..
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    Oh in case if anyone asks why I didn't make a...

    Oh in case if anyone asks why I didn't make a normal CV out and connecting it to the CV in of the volca : I thought, because the volca operates in 3.3v already, I thought it'd work. and also :


    ...
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    CV connection without ground?

    Short version :
    Generating DC voltage from the teensy board and connecting it directly to a 3.3v modular system (Volca Modular) *SEEMS* to work - literally just a jumper cable to a CV input of the...
  27. Alright, I will definitely have a look into that...

    Alright, I will definitely have a look into that :)
    Thanks guys, really appreciate the help !
  28. Thank you for the clarification!! I will have a...

    Thank you for the clarification!! I will have a look at it :)
  29. Oh yes, I'm well aware of the audio design tool...

    Oh yes, I'm well aware of the audio design tool and the documents - my question was on *how* the inbuilt dac works in a low level, because it doesn't look like a I2S dac but it still works well as an...
  30. Oh right, I didn't know that.. A quick search...

    Oh right, I didn't know that..
    A quick search gives me the feeling that none of the MCP chips i mention are I2S dacs..
    Although I dont exactly know what I2S nor SPI means,
    I get the feeling that...
  31. Audio output options for Teensy 4.0 *without* using the official audio adaptor

    I've been researching and learning about this for a few days.. but I still can't get a grasp of the options I have.
    I can already sense that the most of the experts on this forum will be sick of...
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    Thank you for the detailed reply! This really...

    Thank you for the detailed reply! This really helps me.
    I guess I can imagine these two components :
    https://www.adafruit.com/product/2164
    https://www.adafruit.com/product/2165
    - parallelly...
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    Thanks. It does seem safer to use 5v. An...

    Thanks. It does seem safer to use 5v.

    An additional question - I need the device to run on usb and batteries. Not planning to have a barrel connector option. 4 AA or AAA batteries would provide 6v...
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    How do I provide 5v from Teensy 3.2?

    I'm not too familiar with circuitry so please excuse my lack of knowledge :(

    So I've got a USB Host Board mini from this site http://www.hobbytronics.co.uk/midi-player-tutorial
    and following the...
  35. Yeah, understanding memory allocations or...

    Yeah, understanding memory allocations or managing pointers is really awkward for me, having been comfortable all my developing life with javascript. Infact, memcpy itself was pretty baffling to me,...
  36. lolololololololololololololololol imma correct...

    lolololololololololololololololol

    imma correct my own stupidity.

    the incremental bufferIndex should go from 0 to 127, not 0 to 128 hahahahahahahahahaha


    buffer[bufferIndex] =...
  37. making Mozzi work with Teensy Audio Adaptor (SGTL5000)

    Hi guys
    Recently got a teensy 3.2 and a audio adaptor along with it, thinking that i could program Mozzi and have a basic inputs and outputs bundled on the adaptor for easy access.

    well, turns...
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