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  1. Replies
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    While you are fixing the pcb its a good idea to...

    While you are fixing the pcb its a good idea to at least buffer the DACs output with a 740x adding a 68R at the output of the OpAmp. Its standard for Eurorack that every device protects itself as you...
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    While you are fixing the pcb its a good idea to...

    While you are fixing the pcb its a good idea to at least buffer the DACs output with a 740x adding a 68R at the output of the OpAmp. Its standard for Eurorack that every device protects itself as you...
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    Audio is meant to be AC because a microphones (...

    Audio is meant to be AC because a microphones ( and a speakers) membrane swing around their resting position - see here https://en.wikipedia.org/wiki/Alternating_current
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    @senorblasto: These werent used because of their...

    @senorblasto: These werent used because of their limitations - it was cutting edge technology back then and the best available. Its just that you got used to these audible artifacts. You may want to...
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    Fun fact: the unique Sound of famous Synthesizers...

    Fun fact: the unique Sound of famous Synthesizers like the ppg Wave Series, the Waldorf MicroWave Series (and the iconic Waldorf Wave), Sequential Prophet VS, as well as older Korg Synths like the...
  6. Im in for the 3.2 version - would save me a lot...

    Im in for the 3.2 version - would save me a lot of hassle in my modules.....
  7. Thread: Goodbye

    by fdaniels
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    Frank, i would be sorry if you would leave...

    Frank,

    i would be sorry if you would leave here, but i totally understand your frustration. Thats what the internet bacame the last years, a place where your passion, work and knowledge gets...
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    This doesnt look like a valid sketch, lacking...

    This doesnt look like a valid sketch, lacking setup() and loop(), maybe you familiarize yourselves on how to write a sketch (and how to read the compiler messages) first?

    Edit: + i think you need...
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    Pushbutton on Teensy 3.2 Pin 13

    Moin!

    I try to read a pushbutton on a Teensy 3.2 Pin 13 (the one with the internal LED....) the pushbutton shorting the Teensys pin to gnd.

    I set up the Pin with


    const int button6=13;...
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    Its a much newer design that performs better in...

    Its a much newer design that performs better in every aspect.




    Package doesnt matter. But theres a slight difference between 300nF and 22F. Not that much, just about 3 orders of magnitude.
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    @ghostintranslation I cant read your...

    @ghostintranslation

    I cant read your schematics well, as the chosen color schmeme black/red doesnt work very well for me. I'd try the folowing:

    - replace the 2 tiny SMT Caps C1, C2 (?) at the...
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    Checking the Board Pic from above where are the...

    Checking the Board Pic from above where are the usual huge Caps for the regulator? I just can spot 2 tiny SMT ones, i doubt they will be the needed 22uF+ ones. 0,1uF will certainly get the LM78 going...
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    Wouldnt work this was as most linear converters...

    Wouldnt work this was as most linear converters need about 2V Headspace. If you want to go that way first drop to something like 7V.

    Besides this i would suspect something wrong on the teensy...
  14. Try using the U8g2lib which is non-blocking. At...

    Try using the U8g2lib which is non-blocking. At least here using teensy 3.2 with a SD1306 OLED on I2C Pins 18+19 and a PT8211. Yeah, i know but I like weird performing D/As, at least for this...
  15. As for the I2C noise problem it immensely helps...

    As for the I2C noise problem it immensely helps to separate the audio and i2c parts as far as possible physically on the board an make sure the digital/i2c gnd doesnt flow thru the audio gnd. This...
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    You all might want to kill me, but personally i...

    You all might want to kill me, but personally i find the PT8211s sounds quite nice if you are into gritty sounds. Remember, many famous Synthesizers and Samplers had awful D/A (pre 1000 Akais, PPG...
  17. These clicks would also happen in an analog...

    These clicks would also happen in an analog Oscillator if you "switch" it on fast enough. Its not a "digital" problem, its a physical limitation.
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    Cool. Thank you - presumably i was worried...

    Cool. Thank you - presumably i was worried because of bad PicAxe experiences years ago.....
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    So..... i see nothing that couldnt be...

    So..... i see nothing that couldnt be interrupted? I need more coffee....
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    delay() Question

    Moin!

    I have some timig critical things to do and need to know if delay() interrupted by an interrupt while its delaying.....

    Many thanks for any input,
    Frank
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    I use WS2812Serial to drive 15+ LEDs as indicator...

    I use WS2812Serial to drive 15+ LEDs as indicator LEDs in modular synth modules. Im not playing .wav files but have other timing critical things to do which works absolutely flawless. To avoid noise...
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    Happy Birthday from the other birthday child. All...

    Happy Birthday from the other birthday child. All the best to you and you loved ones!
  23. Congratulations, looks great! Whats that fader...

    Congratulations, looks great! Whats that fader for?
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    In the other hand - what do i do with 30+...

    In the other hand - what do i do with 30+ Cards...?
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    What type of "knob" do you record for 8MB...

    What type of "knob" do you record for 8MB Data??!?!?!?
  26. Start with Behringers Model D. Its a clone of the...

    Start with Behringers Model D. Its a clone of the archetypic MinMoog.
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    Maybe this helps, here are some Videos with sound...

    Maybe this helps, here are some Videos with sound examples:

    about the MiniMoog Filter
    https://www.youtube.com/watch?v=yPHJA092a9w

    about self oscillation...
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    The cult around the Moog Filter is all about its...

    The cult around the Moog Filter is all about its iconic sound. For comparison simple filter sweeps of an rectangle Waveform with different frequencies and resonance settings should be sufficient....
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    For me its perfectly OK, but i know how these...

    For me its perfectly OK, but i know how these hardcore geeks are: a Low Frequency Generator has to go from slower than a galcier up to 20khz, an analog VCO has to track withing +-2ct and everything...
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    "synth guy" here: A usefull filter should have...

    "synth guy" here:

    A usefull filter should have "CV" for Cutoff and Resonance preferably up to audio rate for FM. "Ladder" should be sufficient, also to avoid copyright infringements.
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    Why dont you then use the internal Audio Systems...

    Why dont you then use the internal Audio Systems Effects for "small and inexpensive"? Adding a simple circuitry for mixing audio input would allow to use it as an FV-1 FX/Filterbox additionally,...
  32. You dont "reroute data to the SDA pin". The...

    You dont "reroute data to the SDA pin". The display wont know what to do with Audio Data, in most cases its a dumb thing that just diplays whatever Bitmap is sent. You need some graphics library that...
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    What about an Audio IN so you can route a signal...

    What about an Audio IN so you can route a signal thru the Filter + FX, just like the Shruthi. Maybe you could even Sample?
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    You Sir, are crazy! :D

    You Sir, are crazy! :D
  35. Thread: 5V Teesny 4.1

    by fdaniels
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    Encoders and Pushbuttons will work without any...

    Encoders and Pushbuttons will work without any problem with 3,3V. Most LCD and almost all OLED work with 3,3V, too. LEDs work perfectly with 3,3V, you just need to adjust the current limiting...
  36. Thread: I2c eeprom ??

    by fdaniels
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    I2c eeprom ??

    Is there any teensy-approved Library to easily write and read data to an 24lc512 eeprom?

    Any help highly appreciated!
  37. Replies
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    What happens if you push 2 buttons simultaneously?

    What happens if you push 2 buttons simultaneously?
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    You could do your own. If so, why not implement...

    You could do your own. If so, why not implement something more interesting than an ADSR?
  39. Replies
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    You really want to have an exponential release...

    You really want to have an exponential release phase.....
  40. How about some 4051?...

    How about some 4051? https://pdf1.alldatasheet.com/datasheet-pdf/view/173652/UTC/4051.html
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    Thanks for the suggestion, but i simply havent...

    Thanks for the suggestion, but i simply havent enough space to squeeze in a MosFet and 2 Resistors...

    BTW: as i understand OE must be tied to VCC=5V, right? I neeeeeed more coffee.
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    Sadly TME adds 5,9€ Shipping and i currently have...

    Sadly TME adds 5,9€ Shipping and i currently have no other parts to source, so the eBay Seller is cheaper.
    Besides this, can you recommend TME?
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    Are these look OK? I guess its just a wrong...

    Are these look OK? I guess its just a wrong Picture?
    ...
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    WS2812 Logic Level Converter Recommendation

    Ladies and Gentleman,

    i'd like to drive some WS2812 via a Logic Level converter for security reasons. As real estate is precious on my project i'd like to go with a SMT type, preferably one...
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    Just get a better PSU. Compensating for crappy...

    Just get a better PSU. Compensating for crappy PSU is not worthwile the effort as a proper PSU costs next to nothing more than a bad one. When your Circuit is silent with a normal, not superfancy PSU...
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    Are you left-handed? Because you put the Encoder...

    Are you left-handed? Because you put the Encoder to the left of the Display. Since most people (86/87) are Right handed placing it to the right would be much better, since you are hiding the Display...
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    Have you ever tried to run it from a 9V Battery...

    Have you ever tried to run it from a 9V Battery to rule out the noise is coming from your PSU?
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    Shameless self promotion:...

    Shameless self promotion: https://dmachinery.net/modules/triples/
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    First, i never have seen a JFET in a simple...

    First, i never have seen a JFET in a simple Buffer, where a simple TL07x could have been used. Maybe you change this to a more standard approach.

    And id trash the whole hardware delay thing and...
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    You still have the Inductor L1 on the wrong place...

    You still have the Inductor L1 on the wrong place - theres no uses protecting the input of the Linear regulater, you should protect your analog circuitry which still ist directly connected to your...
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