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  1. So I just got my order and tested both MC7800 and...

    So I just got my order and tested both MC7800 and VX7805-500:
    https://www.digikey.ca/en/products/detail/on-semiconductor/MC7805CTG/919333...
  2. I see, thanks, at the time I made this PCB I...

    I see, thanks, at the time I made this PCB I didn't think about heat so I didn't look into that subject at all, now I know a few things.



    Interesting subject for sure.



    Nice thanks for...
  3. Alright I see, No I didn't consider reverse...

    Alright I see,

    No I didn't consider reverse voltage, first time I'm doing anything with power really. Should I add a diode for that?

    Also I was looking at the Arduino Nano that actually can...
  4. What's the benefits of the MC7805CDTG over the...

    What's the benefits of the MC7805CDTG over the LM7805?

    I just checked to make sure, according to Teensy specs, it is supposed to consume 100mA, so it looks right, especially because I'm not using...
  5. Well I use this Teensy every day, it seems to...

    Well I use this Teensy every day, it seems to work fine.



    I was only following the datasheet:
    https://datasheet.lcsc.com/lcsc/1811052003_Changjiang-Electronics-Tech-CJ-CJ7805-3_C21706.pdf
    ...
  6. Would a soft start be problematic with Teensy?

    Would a soft start be problematic with Teensy?
  7. Yes that one might be fine, but I want to test...

    Yes that one might be fine, but I want to test also the dc converter that is pin compatible, but this one is a SIP package so it wouldn't work directly on that pcb
  8. True, well I'm ready to test now, I only need to...

    True, well I'm ready to test now, I only need to unsolder the smt 7805 on the PCB and solder wires to be able to test from a breadboard. Because then I will order a new PCB with the new footprint for...
  9. This is incredibly cheap, but 2 months delivery...

    This is incredibly cheap, but 2 months delivery as usual from AliExpress, I think I'm going to order on DigiKey to test quickly and then I can look for cheaper options maybe like this one.
  10. I have looked it up a little more on DigiKey,...

    I have looked it up a little more on DigiKey, doing a search for DC converters being of Linear Regulator Replacement type and 5v output:...
  11. Very interesting and probably a good alternative...

    Very interesting and probably a good alternative to not redesign anything. It is pricy though, $9.41 CAD as opposed to $0.2738 CAD for the 7805.

    I guess I have a few options to decide on and try...
  12. Interesting, I didn't know about those. The down...

    Interesting, I didn't know about those. The down point is that it seems bigger and it require a few more components than just the 2 capacitors of the 7805, which I'm not sure I could fit on my board....
  13. My multimeter seem not to want to measure...

    My multimeter seem not to want to measure current... it's a cheap AstroAI AM33D, when I set it on "200m" it's going over the limit, if I set it to "10" it's reading 0.00... so between 200mA and...
  14. Or is it only that the power regulator is...

    Or is it only that the power regulator is dropping so much voltage that it is normal and would require a heat sink?
  15. Teensy 4.0 external power burning hot

    Hi,

    I'm working on a complex board for a Eurorack module, that includes a 7805DT power regulator that can take 12v and convert it to 5v. I'm so powering the board and the Teensy 4.0 with this 5v. ...
  16. I can't help you with that. You should open a...

    I can't help you with that. You should open a thread of your own to get proper help.
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    So I tried your solution, I set "slew(true);",...

    So I tried your solution, I set "slew(true);", but I can still hear some noise, it's very low volume though so I have to pay attention to hear it, it's already an improvement. I compared it again...
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    I will try it later today :) You can get...

    I will try it later today :)



    You can get the code here: https://github.com/ghostintranslation/drone , if you look into Voice.h there is the GUI design of one voice, and then this synth has 4...
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    I haven't tried your version yet but I intend to....

    I haven't tried your version yet but I intend to.

    In the meantime here is a video of the synth I had the gain issue with, the Mix parameter does a "spiral motion" to mix the 4 voices in little by...
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    I see, I guess if that were to be added to the...

    I see, I guess if that were to be added to the library that could be the right implementation. In my case my simple "multiplier += (smoothness * (multiplierTarget - multiplier)) / 1000;" seems to do...
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    Indeed, I did a little something starting from...

    Indeed, I did a little something starting from the mixer object, might need some tweaking but it works, no more noise and adjustable slew:



    #ifndef audiosmoothamplifer_h_
    #define...
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    So first with this code: #include ...

    So first with this code:


    #include <Audio.h>

    AudioOutputI2S i2s2;
    AudioSynthWaveformSine sine; //xy=243,108
    AudioConnection patchCord3(sine, 0, i2s2, 0);
    AudioConnection...
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    Yes well beyond what a pot do if it is directly...

    Yes well beyond what a pot do if it is directly linked to that setting, but I do smoothing on it to avoid noise and hearable steps. I read the pots every so many ms to set a "value target" and then...
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    Ah I will definitely try that! Well I...

    Ah I will definitely try that!



    Well I would like to be able to do a change from 0 to 1 of the gain in no more than 1 second and smooth enough that it doesn't feel steppy.

    In my example...
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    I see, An object for a gain slew could be a...

    I see,

    An object for a gain slew could be a solution, that sounds a little out of my capabilities though but I can have a look.

    and there is no way to boost the Audio processing so it updates...
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    So it depends on the step increment and the...

    So it depends on the step increment and the frequency of increment.

    For exemple with an increment of 0.0001 I need to increment a step every 1ms to stop hearing it, which means it takes 10s to go...
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    You mean the extreme click would also be...

    You mean the extreme click would also be happening at much lower intensity when going from 0.01 to 0.02, but doing it fast enough would then generate this frequency?
    That could be...




    I...
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    I just tried something and that changes a little...

    I just tried something and that changes a little bit what I thought. I removed the amp and I'm varying the amplitude of the sine instead. That generates the same noise:



    #include <Audio.h>
    ...
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    Here is a recording of what I hear when varying...

    Here is a recording of what I hear when varying the amp gain value constantly:
    24530
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    Mixer and Amp gain really noisy

    Hi,

    I'm using Teensy 4.0 with the audio adapter.

    I was working on a synth when I started to notice that varying the gain value of an amp object with a potentiometer was generating a side high...
  31. So you said the signal was inverted and I...

    So you said the signal was inverted and I suspected that because of the readings I was getting and I thought this is probably different than with the 6N138 example I saw on the website... And so...
  32. So I have tried to connect the EN pin to 5v and...

    So I have tried to connect the EN pin to 5v and add a 100nf cap between gnd and vcc but it didnt change anything.
    So then I did a simple program just to read the pin instead of trying to get MIDI as...
  33. Can you share the link of this datasheet? Doesn't...

    Can you share the link of this datasheet? Doesn't sound like the same I'm looking at.
    I don't have the enable pin on the supply nor the 100nf cap. I can try that.



    Ok I see what you mean about...
  34. Teensy 4.0 serial optocoupler 6n137s

    Hi,

    In order to protect the serial Rx pin 0 on Teensy 4.0, I've made a pcb with a 6n137s like that:
    24395
    But it's not working.

    My goal is to be able to connect another teensy serial Tx but...
  35. OK so finally I don't know why I had excluded...

    OK so finally I don't know why I had excluded doing a voltage divider, but in the end it works just fine for what I'm doing... I had to take a break to see it...
    So I'm just lowering the input...
  36. Well actually I could do a voltage divider with 2...

    Well actually I could do a voltage divider with 2 resistors like in figure 6.5 , it's just that it means 2 more resistors to add and I'm very tight on space (even SMT) .

    I see also the...
  37. Ah I see, and also I only notice now that this...

    Ah I see, and also I only notice now that this chip has an internal voltage reference of 2.048V which Vin should not exceed... This chip might not be the right choice for me in the end...
  38. I didn't know LTSpice thanks, I made a simulation...

    I didn't know LTSpice thanks, I made a simulation that seems to work as expected.





    Schottky diodes seems more interesting indeed and the BAT54S looks nice, I like that there is the 2 diodes...
  39. Teensy 4.0 external ADC and voltage protection

    Hi,

    I'm doing a board that will accept a range of 0-5v as analog input. As Teensy 4.0 accepts only 0-3.3v I was looking at ways of making this work. So I was looking at linear optocouplers,...
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    Yeah that's just the photo, the traces keep going...

    Yeah that's just the photo, the traces keep going to the "JPLED" connector. That might be the 45 angle on the low quality jpg that do not translate.



    And we have a winner, for some reason the...
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    I had the PCB done by JLCPCB, I soldered only the...

    I had the PCB done by JLCPCB, I soldered only the pins that are used:

    23638

    23639

    23640
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    Thanks for the suggestion, First I made it...

    Thanks for the suggestion,

    First I made it work with the audio board and the scanner, I had to add these 2 lines at the top:


    #include <Audio.h>
    AudioOutputI2S audioOutput;


    also I...
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    So I've made a PCB only with the TLC59116 chip...

    So I've made a PCB only with the TLC59116 chip and the few required resistors to test. I still get the same result.

    I looked up the chip datasheet, and the address of this chip when A0-A3 are at...
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    Ah I looked at the schematics and since it was...

    Ah I looked at the schematics and since it was saying 3.3v to 5v power supply I chose 5v (cannot remember why though) but you are right the typical example shows it powered with 3.3v...
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    Thanks for the suggestions, So I have run that...

    Thanks for the suggestions,
    So I have run that test without the RESET and REXT and also with them (but I'm connecting the resistors on that super small chip holding everything in my hands so I'm...
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    Teens 4.0 TLC59116 Led Driver

    Hi,

    I'm trying to use a TLC59116IPWR that I made a pcb with but nothing happens. Here is the schematics:
    23332

    First, I noticed I might need to actually wire RESET and REXT, but I tried to do...
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    Thank you I appreciate that, I didn't know about...

    Thank you I appreciate that,
    I didn't know about Tindie actually I just googled it and it looks interesting, thanks for the tip
  48. Replies
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    Shipping takes a good 2 weeks to Europe, maybe 3...

    Shipping takes a good 2 weeks to Europe, maybe 3 this time of the year.

    I'd say it's pretty easy, there are only through hole components and not a big list of them. Just make sure to read the...
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    Thanks, I sell the boards to help me with the...

    Thanks,

    I sell the boards to help me with the cost of engineering all this, so I haven't shared the Gerber files yet, but I intend to open source everything so I give all the schematics and code....
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    Teensy 4.0 modular platform

    Hi,

    About a year ago I posted here to show the very first version of my work.

    Now I have a pretty stable platform, but I'd like to hear any ideas how to improve quality of the electronics, or...
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