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  1. Braeden Hamson

    Best course of action for high current DC supply

    This isn't a continuous discharge application. Stab the throttle for 2 seconds then brake. That's racing. Our datasheet says 20A peak discharge. So push them a little over. Again racing. We can only use the car for one year so no point in being nice. And why is "your team" in quotes? Maybe it's...
  2. Braeden Hamson

    Best course of action for high current DC supply

    Its a 72s12p pack, ~300V and ~280A. If a cell shorts bad things happen. We're going to rate the fuse to blow at something like 50A over 30 seconds. We don't have that part nailed down yet, input on that is appreciated as well. And like I said 600-300 is just a very crude probably very wrong...
  3. Braeden Hamson

    Best course of action for high current DC supply

    Hi, I'm on an FSAE team that's making an electric car. We're making a battery pack out of discrete 18650 cells. In the pack every cell must have a fuse between it and its bus bar. So we have to size the fuse and, rate it for the appropriate current. Somewhere from 300A-200A at ~1V. I need to...
  4. Braeden Hamson

    Changing a positive and negative audio signal to positive only

    I'll give this a try, thank you
  5. Braeden Hamson

    Advice on setting up realistic documentation standards for a student club

    I'm part of a FSAE team at my university and I'm looking to make function just like an engineering firm would. (Tips on that unrelated to my question are appreciated too) Since we're going to begin designing soon I'd like to set up a documentation format that is similar to that found in the...
  6. Braeden Hamson

    Changing a positive and negative audio signal to positive only

    True, but he does want it to actually show the sound's waveform.
  7. Braeden Hamson

    Changing a positive and negative audio signal to positive only

    That's pretty awesome not gonna lie. That's why I didn't define better. I didn't know I wanted clamping. Thank you
  8. Braeden Hamson

    Changing a positive and negative audio signal to positive only

    My brother wants to build a "decorative" osilloscope for lack of a better term. Using an Arduino and a small oled screen. This will be used to visualize wave forms in music. I know music looks like a mess on a scope but this will be very basic tones, that will be assembled into music. Like...
  9. Braeden Hamson

    Changing a positive and negative audio signal to positive only

    Thank you, I knew it was something relatively simple and I was just spacing on what it was. And you're right I should just be upfront about why I need the circuit. My brother wants to build a "decorative" osilloscope for lack of a better term. Using an Arduino and a small oled screen. This will...
  10. Braeden Hamson

    Changing a positive and negative audio signal to positive only

    Hey guys long time no post, I've got a standard audio signal out if a computer which has a positive and negative portion. I'd like to shift the whole signal up so it's only positive. I've seen this done with a voltage divider where the signal is connected to the node of R2 that isn't connected...
  11. Braeden Hamson

    Oscilloscope for dummies.

    Some general tips then? The most important thing is that oscilloscopes do not measure across components. They measure from ground to a point that had a higher voltage than ground. Make sure you're on DC or AC coupling where appropriate. Make sure your scope know what your probe comp is. Be it...
  12. Braeden Hamson

    Sonicator

    Braeden Hamson submitted a new Project Log: Sonicator Read more about this project log here...
  13. Sonicator

    Sonicator

    (Note I uploaded a picture of a dog because its the only picture that successfully uploaded and I needed one.) Holy crap I did it! This was far and away the hardest project I've ever done. I decided to type up my results to tell you all about this because a few of you helped me get here, but...
  14. Braeden Hamson

    Varying the output frequency of an ultrasonic driver board

    I constructed the H-Bridge, it works as intended. Though I can't measure the "negative current" created by the bridge using my oscilloscope. No matter, I used a motor to verify the functionality. And I've just now realized I used N-channel MOSFETs for the whole bridge... I'll be heading out...
  15. Braeden Hamson

    Varying the output frequency of an ultrasonic driver board

    That's very funny BTW I should've been more clear. That is not my schematic, I got it from hackaday. Someone else reverse engineered it. The board already exists, and is specified at 100W.
  16. Braeden Hamson

    Varying the output frequency of an ultrasonic driver board

    I'm making a sonicator which is this nifty device that allows you to make emulsions without a surfactant or emulsifier. You can also make extractions from cells without additional chemicals. (everything is a chemical) I would like as much power as I can get a hold of, but don't we all. My board...
  17. Braeden Hamson

    Varying the output frequency of an ultrasonic driver board

    Now that I'm actually awake this makes much more sense I completely disconnect the winding if L1-1 and put my Arduino set up across this wire. I'm not connecting my Arduino to R5. Clever. And I'll need the H-bridge to drive current in an AC fashion correct? Thus far I've focused on digital...
  18. Braeden Hamson

    Varying the output frequency of an ultrasonic driver board

    Thank you as always for you help. Yeah thinking on it I don't know why I even mentioned the switch, I can probably actuate it in 500 ms at best, which is an eternity and a half in the electronics world. The system is connected to a house hold wall outlet that is on a breaker circuit. I don't...
  19. Braeden Hamson

    Varying the output frequency of an ultrasonic driver board

    Hey guys, So I've got an ultrasonic system with a driver board and transducer. I would like to be able to vary the output frequency, as I've developed a horn that resonates at 26 kHz and not the 28 kHz the board outputs. The circuit looks something like this...
  20. Braeden Hamson

    Power calculations aren't this easy are they?

    I knew I was overthinking it. The key point you guys helped me realize was I can't say it used 50 watts. I have to say it used 59 Wh. But I can say it's using 10W. Thank you all
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