I am trying to measure the current being drawn by a nema17 stepper motor. I do not have current probes, so my plan was to use a 1 ohm through hole shunt resistor. My concern is that at P = R*I^2 = 1*1^2 = 1 W the resistor may overheat (I read that most are rated for 0.25 W). What solutions are there for resolving this?
I rarely win the silicon lottery but it seems I kind of did with this FE card. But because of the stock cooler I’m forced to run it at 1855mhz @800mv but it scales up to 2010mhz @900mv before hitting the 400w power limit (mostly stress using 8k superposition and port royal). On lower work loads I can make it boost to 2200mhz. As far as I can tell this is Strix LC territory in terms of binning.
Is a 520w limit safe for daily? The most stressful things I’ll be doing is just gaming at 4K 120hz native so I’d like to squeeze every last frame out of it. I feel like its potential is wasted unmodded but at the same time I want it to last at least 2-3 years minimum. I’m financially stable enough to take on the risk of the card dying but I don’t want to be stupid about it if the card clearly cannot handle it.
Thoughts guys?
Traveling and taking a long transatlantic flight for the first time since surgery. Anything I should look out for?
Hello
I want to shunt mode my 3090 strix. Does anyone here knows how to do it and guide me? Or is there a guide already written for it? I understand the consept behind it. I would like to know how much resistance do I need and where to solder it.
My 3090 is watercooled front and back.
Has anyone tried to do weightlifting and had really bad pain along the side of your neck where your Shunt is? I've had my Sunt for a over 29 yrs. It happens when I strain really hard doing over head presses.
I am an avid gym-goer. I love to lift weights, I love dieting, I love scheduling, cooking, etc. This summer, I began to have seizures, it was discovered that I had a strange occurrence of epilepsy. Since then I have had two more. So recently I was rushed to the hospital for the last seizure, I then had a VP shunt procedure done. I was told that the shunt and the seizure were not related to one another, and I have hydrocephalus which is also not related to the seizures, so I guess what I'm wondering is should I keep it? Also how long after getting a VP shunt until I can safely lift weights again? or get back to my normal routine period? I don't want to change my routine for something that I'm told was a waste of energy, to begin with.
The shunt I have now works great, but I do feel like if I get a head injury where it is, it would be a liability.
Got a call from my neurosurgeons assistant today, they want me in tomorrow for a consultation and a pre-op meeting regarding VP shunt surgery they’ve scheduled for next Monday. Just wondering if anyone could provide any insight to what I can get prepared for when I’m home for recovery?
In your department, who checks and resets magnetic VP and LP shunts post MRI? Right now we have the neurosurgery residents doing it, but it often results in a long wait for patients post scan.
Is it possible to connect a shunt directly to and esp32 to measure bidirectional current measurement? Have the information sent to Home assistant or node red via mqtt?
Hey parents, my daughter Margo will be getting her VP shunt soon once she can gain a little more weight. To sum it up she has a grade 3 IVH which led to post hemorrhage hydrocephalus along with a clot in the fourth ventricle and some inflammation. (She currently has a reservoir and they pull 12-17cc’s daily).I’m reaching out for insight on what I should expect when it comes to surgery and after. Positive stories would be appreciated as well!
https://preview.redd.it/kyrb9j1cek581.jpg?width=4032&format=pjpg&auto=webp&s=b77955a74e8b3e749461f0ef10f412662d6a8865
We are trying to measure the inrush current of a small air mattress pump with an oscope and a shunt, but this data doesn't look right. The shunt is 50A:75mV, so going off the oscope reading that means the pump pulled ~638.67A at one point. I doubt that.....the pump's amp rating is 8A.
Probe and attenuation in the scope is set to 1x. What are we doing wrong?
EDIT: Did want to mention that what is supplying power to the pump is a portable power unit for camping. So there is a lithium battery inside, a BMS, and I'm hooked up to what would be the cigarette port.
EDIT 2: My coworker decided to check the probe compensation calibration thing and it was off. After adjusting the calibration screw on the probe to make the square waves clean, it's showing something that makes sense.
https://preview.redd.it/c37m8896mk581.jpg?width=4032&format=pjpg&auto=webp&s=eb483ce8b6ab2c0f1c92561da725570a614fb690
https://preview.redd.it/vxfu6ix7mk581.jpg?width=3024&format=pjpg&auto=webp&s=d2183232064e6ebfb83c8212e34497e9b82b28f1
This is a weird post. Sorry. I'm out of the country and trying to get home. My dad just had a shunt put in on Wed. He's suffering from Hydrocephalus. Unfortunately I'm relying on my elderly mother for info and she says that yesterday the surgeon stopped by and turned OFF his shunt and said it was "draining too much". Is that a thing? She said he said to call monday and set up an appointment at the office for next week. What's weird is this all happened in the hospital. He turned it off while Dad was still in the hospital. He was moved over to skilled nursing last night.
Edit: I called the hospital from where he was discharged and the nurse on duty said his chart said something like "shunt turned off due to Hydroma**"...or something like that.**
If there was an issue, wouldn't he go in a fix it while he's at the hospital? There's also the possibility that my Mom is not relaying all of the info. However, she's certain he turned it OFF. This is a really highly regarded surgeon and after the surgery, he said he was very pleased with the procedure.
Can anyone shed any possible scenarios where this might happen? I know my info is spotty but that's really all I know. I won't possibly hear anything more till monday.
Thank you
Hi all,
Is the main difference between a shunt regulator and a Zener diode the steepness of the I-V curve in the reverse bias direction. I was looking at the TI's LM4040 and noticed the Z_R is around 1Ohm compared to zeners which are around 30x larger.
Hey,
I am have a 1994 Hymer B564. I have purchased a lithium ion battery which I want to monitor using the Renogy 500amp monitor. The current fuse box is full, so to wire in a few extra things I am going to get another fuse box to run a few 12V appliances.
Firstly I will need to replace the existing shunt that comes with the Hymer, which I suppose you can just switch out pretty easily, however, to ensure the shunt is effective for both the existing appliances and my new ones (on the new fuse box), can I run the negatives of the new fuse box to a bus bar and then the negative of that bus bar to the shunt.
Thank you
Neurosurgeon doesn’t seem to think it’s a big issue, because my condition is “chronic, not life threatening” if untreated. I understand I’m not as big a priority as emergency hydro patients, but can’t brain damage happen anyway? I’m not projectile vomiting like when I was first dx, but I’m nauseous, have severe head pains, and my cognition and quality of life is getting worse. Phone call follow up in a week but I’ve already been dealing with these symptoms since my ligation surgery 7 weeks ago.
At what point should a ligation be considered? After something like a shunt tap or other testing and imagery? After how many attempts at finding the right valve settings? He refused to do shunt tap on me before. He said a ligation was easier than a revision for my symptoms which could’ve been a shunt malfunction, but also my hydrocephalus could’ve been temporary. Now his only tool is a lumbar puncture which was actually painful last time and becoming a small torture to endure. My LPs have borderline high opening rates due to where my tumor+cyst was that lead to hydrocephalus, but he doesn’t believe me or take into consideration the research my previous neurosurgeon (who recently retired) did which confirms pineal cyst/tumor patients experience hydrocephalus at slightly lower opening pressures than most people. I fear if I have another borderline opening pressure he won’t do anything and I’ll slowly decline, and be stuck with complications from the ligation. Why couldn’t he have done other tests before ligating? Maybe I should have pushed harder? I had 4 or 5 adjustments with my first surgeon over the course of 7-8 months, and this new surgeon didn’t want to try any more settings.
The ligation caused some issues with the incision in my chest, a seroma apparently, which empties and fills almost daily to every 2 or 3 days. My shunt tubing is also very tight now and I can’t even extend my neck on the side with the tubing, or pivot my neck some days.
This is a new surgeon and I’m a vulnerable person who doesn’t do well with doctors anymore (autistic and now medical ptsd), and I don’t know if my experience with this new guy is normal in any way. I advocate for myself but I’m afraid of coming across as argumentative. My family have no idea what I should do or how to support me. I feel like I’m losing my mind out of worry and legit illness impacting my every moment. Is it time for a second opinion? My only other option may be to go out of state, where I only ha
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Has anyone here had a VP shunt or VSS stent? I’m trying to decide between the two.
I’ve been told that the shunt has a lot of complications, risk of infections, risk of rejection, risk of faulty shunts, and risk of needing to get one replaced after 10-15 years.
Because of narrowing noted in my junction of transverse and sigmoid sinus shown on the MRI I’m also supposed to consider a stent to open up that vein and relieve the narrowing that could potentially be the cause of the IIH.
I’m leaning towards the stent because it seems less invasive but the neurosurgeon warned me that taking blood thinners for the stent would prevent me from getting the shunt if the stent did not relieve my symptoms.
Any advice or experiences or questions or anything is welcome.
