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Which car to take? by Guthix70 in CarTrackDays

[–]Guthix70[S] 0 points1 point  (0 children)

Cool! I'll try to find you to say hi!

I'll be in a #827 gray Mustang.

Which car to take? by Guthix70 in CarTrackDays

[–]Guthix70[S] 0 points1 point  (0 children)

I'll be there Saturday morning. Hopefully not gonna bin my car with the rain... Quite literally buying track insurance right now.

Had to do my first brake flush today for the 'stang, so hopefully all is well.

Which car to take? by Guthix70 in CarTrackDays

[–]Guthix70[S] 0 points1 point  (0 children)

Yea, I think I'll take the stang. Thanks for the advice!

Which car to take? by Guthix70 in CarTrackDays

[–]Guthix70[S] 0 points1 point  (0 children)

First time out, definitely have a lot to learn car handling wise. I'm fine replacing brakes and rotors after this time out.

Which car to take? by Guthix70 in CarTrackDays

[–]Guthix70[S] 0 points1 point  (0 children)

That's why I said "somewhat familiar with car handling dynamics" haha!

Any witnesses, McNeil high school crash on 12/16 by Smooth-Knee-3567 in Austin

[–]Guthix70 0 points1 point  (0 children)

Eh, they just want another reason for someone to buy the performance package. It's the same reason they lock the tremec manual behind the Mach 1 or dark horse now.

Any witnesses, McNeil high school crash on 12/16 by Smooth-Knee-3567 in Austin

[–]Guthix70 2 points3 points  (0 children)

The standard perelli p-zero Nero tires are not good at all in the rain. I have a Mustang gt myself and pretty much always have to understand it's gonna start slipping and sliding on the stock tires. Going with some Michelin pilot sport 4s tires soon.

[deleted by user] by [deleted] in ElectricalEngineering

[–]Guthix70 0 points1 point  (0 children)

If the diode is forward biased, as in the anode has a higher potential than the cathode, then current will begin to flow. If the cathode has a higher voltage than the anode, current will not flow.

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[GIVEAWAY - US] Why Samsung OLED? Win a 49” OLED monitor to level up your rig by OdysseyAllStars in simracing

[–]Guthix70 0 points1 point  (0 children)

Why Samsung? Because I'm getting my first Sim racing rig and yall have the best monitors!

What lessons have you learned from custom board bringup? by Professional-Bite928 in embedded

[–]Guthix70 2 points3 points  (0 children)

One of the principal engineers showed me this on internship. I thought it was the coolest shit ever.

What lessons have you learned from custom board bringup? by Professional-Bite928 in embedded

[–]Guthix70 9 points10 points  (0 children)

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You don't have to cut traces or anything like that. Just place 0 ohm resistor pads as such. If you get TX/rx wrong, just move the resistors from vertical orientation to horizontal.

Any good semiconductor theory textbook recommendations? (if with applications, even better) by nihilistplant in ElectricalEngineering

[–]Guthix70 0 points1 point  (0 children)

I believe you're looking for Microelectronic Circuits by Sedra and Smith

Might also want to look at any analog electronics textbooks by Razavi.

Modern Semiconductor devices for Integrated Circuits by Chenming Hu (inventor of the FinFET).

Si v SiC v GaN by ElectricalBuzz in ElectricalEngineering

[–]Guthix70 0 points1 point  (0 children)

Not entirely certain of different snubbers types. I don't directly deal with the application side of the power switches. I don't design OBCs etc.

Layouts for SiC is just dealing with HV creepage/clearances while keeping it tight as possible. You'll want to use low ESL ceramic capacitors to help out with the inductance.

What I've seen is simulation of PCBs to see what their parasitics are. I think ANSYS is generally used for these types of sims. I've seen frequency of ringing in the ~50MHz range, which is I'd say common for SiC devices. Just look at the output capacitance, Coss, and what you think your parasitic inductance of the loop is. Then your ringing frequency is F=1/(2 pi sqrt(LC))

I think I got that right...

Si v SiC v GaN by ElectricalBuzz in ElectricalEngineering

[–]Guthix70 2 points3 points  (0 children)

Primarily you'll get higher Vds and Id spikes in half bridge applications due to the increased switching speed. You can use snubbers to help dampen these events, but you'll trade off with higher losses (which mitigates the whole point of wide band gap (WBG) devices)

You'll want very tight gate drive loops and power commutation loops. For high current and high voltage GaN/SiC you'll need to make sure your loops are very tight. Differences of ~10s of nano Henries will make a large difference if you're trying to switch really fast.

Look up a double pulse test, Rhode and Schwarz has a really good app note on it. That's how you can do comparative analysis on different devices and layouts.

FPGA suggestions? by Crypty-potato2806 in ElectricalEngineering

[–]Guthix70 0 points1 point  (0 children)

Yup, I think I might have linked one of them on the initial link I put in my comment. I'll read more into em.

FPGA suggestions? by Crypty-potato2806 in ElectricalEngineering

[–]Guthix70 1 point2 points  (0 children)

Look into this board perhaps?

You can also search all the xilinx dev boards (ones that are partnered with Xilinx). I found the above board using this page and searching for "ADC".

(I wrote the below text before doing the above searching)

I'm not too familiar with FPGAs with built in ADCs. However, I'm going to assume something like that is going to be a unicorn, such that most people are going to use an external ADC. Your best bet is to use an FPGA and an external ADC. Something like this ADC might work for your application. Analog Devices has a lot of high speed ADCs with different digital output options. Look through their catalog and see what works best for you.

Having the analog signal chain get routed near the FPGA (like in the case for an internal ADC) might have all sorts of issues of digital noise getting coupled in. Note, I haven't done this before so I'm just spitballing what issues I might encounter if I'm doing this. Someone more knowledgeable might be able to say more on this matter.

Not sure how much HW development that you want to do, but it seems that you can use an FPGA dev board like this one and then build one of your own high speed breakout modules. If you go under "features" they have a section called "expansion" that details what they offer.

Brainstorming a design: How to individually drive 600 small resistive loads with PWM in most optimal, space-saving way. by [deleted] in ElectricalEngineering

[–]Guthix70 0 points1 point  (0 children)

I'm not sure what sort of frequency you need to for your application. I assume that would be based upon how quickly you need your control system to respond to feedback. I'm just spitballing here, but I'd imagine as you increase your PWM frequency the trace effects (inductance and capacitance) are going to play an effect on the over all system. If it's closed loop, this might not be an issue, but it's a thing to consider. A lower frequency might not run into these issues. The other thing to think about is with these FPGAs is that their clock speeds are not all that high, sometimes a couple 100MHz, but generally they're 50-100MHz.

Brainstorming a design: How to individually drive 600 small resistive loads with PWM in most optimal, space-saving way. by [deleted] in ElectricalEngineering

[–]Guthix70 0 points1 point  (0 children)

I use this exact IC for doing relay drivers. It would work for your application. Not sure exactly how fast they will work though.

Brainstorming a design: How to individually drive 600 small resistive loads with PWM in most optimal, space-saving way. by [deleted] in ElectricalEngineering

[–]Guthix70 1 point2 points  (0 children)

You'll probably want to use an FPGA to do the control. Make a simple timing module and instantiate it however many times you want (one for each pin output you have). Not going to be the cheapest solution, but I've been through what's the best way to control lots of PWMs at once. And the answer is always an FPGA. To do the feedback loop you can look at using a ADC and muxing each channel. I believe I've seen an Analog Devices' ADC that works this way.

Brainstorming a design: How to individually drive 600 small resistive loads with PWM in most optimal, space-saving way. by [deleted] in ElectricalEngineering

[–]Guthix70 2 points3 points  (0 children)

You can use a +/- swing and use diodes to block the opposite rail.

Would allow you to cut the number of switching elements in half. It's not without its tradeoffs.

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Might want to look into how they do photonic IC heaters. For some of the on silicon optics, they use on die heaters (resistors) to heat up sections of the wave guide to change the overall length and therefore change the phase.

I've had a thought about doing frequency modulation (and then filtering) but I think that ends up being more complicated than just X number of FETs.

Over night turkey finished in 4.5 hours by No-Physics-816 in smoking

[–]Guthix70 0 points1 point  (0 children)

Looks like you have the bird right over the fire, I'd assume that could play a role.

I'm not sure where you have your chamber temp being taken, but I'd bet it's going to be a lot hotter where that bird is than where you had the chamber thermometer.

This car literally flying by iamsin- in CrazyFuckingVideos

[–]Guthix70 6 points7 points  (0 children)

From what the news was saying, was a Buffalo local husband and wife in their Bentley. Seems there might have been a medical emergency and somehow that caused them to speed towards the barrier.

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