I am sewrching for 1-5pF capacitor with more than 4-5GHz srf.. I searched in digikey, murata and some other websites.. but I didn't het any. Can I get soke capacitors or is there any other way to do matching..
tl;dr: my car goes “eeeeeeeeeeeeee” and nobody can hear it but me. How can I prove it?
In my car, in the driver’s seat, one can hear a tone somewhere in the 12-14 kHz range. No combination of audio settings seem to matter, off, on, Bluetooth, not Bluetooth, doesn’t matter. If the car is running, the sound is there.
I believe it’s “leaking” from something or somewhere since it doesn’t seem to be coming from the speakers. Further, when I’m sitting in the driving position I can hear it, but if I tilt my head sideways I hear it less. If I physically move my head to the right about a foot, I can’t hear it. But a foot right and forward and it’s back. This tells me there’s destructive interference some places but not others. Like when you can hear an A/C unit running outside in the corner of your bedroom but not at the door (this happens at my house; the low frequency emissions focus at that point).
I am not an engineer. I know just enough about sound waves to make the preceding assumptions - definitely correct me or my terminology if I’m wrong. What I need to do is prove the sound waves exist. My parents can’t hear it. The mechanic can’t either. But they can’t hear those frequencies anyway. So I need to prove with a recording and ideally a graphic representation of some kind that the sound exists in that specific spot. I need a piece of equipment that can measure that frequency. I have no idea what to use. If anyone can help, I’d be grateful.
As my shroom trip was coming down I smoked some bud bc ppl recommend it. But my peripheral vision went blurry so I went to bed and that’s when I heard nonstop frequencies. I felt veeeerrry woke in the moment. I was aware of many sounds, many sensations. My pineal gland felt so close. What happened to me?
And it really hertz
Hi! I've just finished assembling my Bitx40, and when I turn on the radio, I hear a terribly loud noise (link to listen below). The radio works fine, because I can hear some operators behind that noise, but I cannot tune the radio loud enough to hear them properly, as the noise is extremely loud even on the smallest volume. I don't really know what's happening gere. Any help?
The noise: https://www.youtube.com/watch?v=1j0ywo45N7I
Update:
I've added two 47nF (0.094uF total) ceramic caps, one 330pF ceramic cap, one 10uF electrolytic cap and another one 100uF cap across the DC input. Unfortunately, the problem is still there.
However, I've assembled a simple 12V battery from one 9V battery and two AA batteries. With this as my power supply, the problem is gone. I can still hear some faint noise, but that's probably due to the fact, that I've been testing this setup right next to my PC, two monitors and a lot of other RFI-generating stuff. So I guess the only way to deal with my problem is to buy a large 12V acid-lead battery and a dedicated charger.
I vaped 2-3ml of propylene glycol daily (for 3 days) with a very low concentration of DMT (around 50mg/ml). I really enjoyed the peace of mind that it brings while not being incapacitating as a higher dose would be and it had the interesting side effect of reducing my tobacco consumption by 90%. I'd like to know more about this way of using DMT, any thoughts or experiences?
Can you post some eq without high shelf filter? The eq profile for he4xx is unusable.
- Denon X1400H
- Philharmonic AAM LCR
- OWM3 Surrounds/Atmos
- PB-1000 sub
I recently ran Audyssey MultEQ Editor setup and have been 98% thrilled with how much better the results were compared to the regular on-board Audyssey setup. I turned off midrange compensation, and limited the EQ to 500hz on all channels per another redditor’s advice to eliminate a sibilance issue I was having. That, combined with CinemaEQ engaged, helped a lot.
However, there is no CinemaEQ in 2.1 Pure Auto our Stereo mode, which is what I listen to music in.
When listening to tracks such as Take Five or Monkey Wrench, the hi-hats or cymbals are waaay too loud. It becomes fatiguing to listen to. And I have to listen in reference — listening in Bypass or Flat does bring out a bit more detail, but the high end becomes even more Obnoxious.
I tried going into the curve editor in MultEQ Editor, taking off the EQ limiter, and doing a smooth rolloff from 200, ending at about -10db, and then another curve that I left alone until about 3k, which I rolled off aggressively. The second of these curves reduced the harsh hi-hats nicely, but both of these curves resulted in a too-heavy bass response, when before everything was nice until the upper high-end, and when I watched TV in 5.1.2, everything especially dialog sounded all unbalanced.
I don’t know very much about this EQ stuff and have had/will have minimal time to research.
Would it best behoove me to take the time to run Audyssey again, or play with the EQs more? Any other suggestions?
Hi /r/FPGA, I'm developing an accelerator on Arria 10 GX 1150 and need a large amount of blockram for a design who'se targeted frequency is 400MHz.
I am hoping to be able to store ~1 million 32 bit words on the device. Obviously I know I can't just instantiate one large DPRAM module and expect it to meet timing.
I am not at all worried about latency but it is critical that I keep throughput at 1 read or write per cycle.
Currently my plan is to instantiate a bunch of smaller memory banks and use the lower bits of the write / read address to index into the proper bank. The indexing will obviously be pipelined over many cycles.
Has anyone managed to achieve something like this? If so, any tips?
Does my strategy make sense? If it does, how many bits are reasonable to index into per cycle. I'll most likely have 1024 banks of 1024 words (each bank is implemented with two 16b1024w DPRAM modules acting together as one 32b1024w module), so if I only use one index bit per cycle that would mean 10 cycles to get to the bank and 10 cycles to get back to the bus. Can I get away with more index bits per cycle?
Thanks!
I am hoping someone here can help me with this, as I am going a little bonkers over it. I work for a rental company and drive all sorts of cars, and have had my heart set on buying a 2018+ Camry for the past year or so. I saved up a large down-payment and got a beautiful 2018 SE, with 7k miles and a clean history. Everything seemed perfect on the test drive and thorough inspection of the car. The night I got my car home I noticed an extremely high pitched electrical noise, exactly the same as the noise a CRT TV makes, only louder, associated with the HVAC system. It is loudest when I have my front defroster on, but can be heard at varying degrees of intensity whenever the HVAC system is turned on. It becomes especially pronounced when the mode is cycled, but never fully stops.
The reason I gave context of my job, is that I have access to a number of Camrys at work, and was in a rented one for a few weeks while my last car was in the body shop over the summer and it definitely did not have this issue. This morning I checked the three Camrys on our lot, two of them did not make any such noise, but one of them did the same thing mine does. I am starting to seriously worry, because while I have found other people on the internet with the same issue, I haven't come across anyone finding a solution. I am beginning to suspect that this is why the previous owner traded it in, as it is a very piercing sound, albeit relatively quiet, and leaves my ears ringing at night after driving the 30 mins home from work. I unfortunately cannot afford to trade this one in, and I'm worried the dealer is going to claim they don't hear it, or throw possible solutions at it to no avail, as seems to be the case with the other owners I have come across online.
I was so happy to finally purchase the car that I aspired to own, with a nice feature-set at that, but at this point I am dreading having to drive the car after owning it for less than a week, and I feel sick imagining the possibility of being stuck with this for years. I got home at 6:45pm, and now at 9:00 my ears are still ringing and I just want to sleep.
Seeing as I don't seem to be the only one having this issue, has anyone else come across this problem, and was a solution ever found?
Thanks in advance for any help you guys are able to provide. I really want to love my car.
Looking for something to go at the very end of my chain right before going into an interface in stereo and/or mixer for playing through headphones, just to get rid of some of the highest frequency content.
Essentially, the chain goes: guitar -> mono effects -> preamp pedal -> Torpedo CAB M -> stereo effects -> interface/mixer with headphone monitoring.
One of the last pedals in the stereo part of the chain, the Source Audio Ventris, seems to have some very high frequency (~ 15 kHz) content on the spring settings in my particular setup.
Is there a pedal that works in stereo to take off the high frequency content? Ideally it'd work on both channels with identical gain and cutoff for each channel. I wouldn't need a ton of adjustment, but a sharper cutoff would probably work best.
Suggestions for DIY also welcome. I would also consider some kind of multiband compressor. I'd prefer not to use a plugin so I could avoid latency or not need a computer when playing.
Question is in the title. Is there a specific phenomena that makes the combination of a ferrite bead and bypass capacitor for moderate (1 - several MHz) and high frequency (several MHz - GHz) attenuation necessary, versus just a bypass capacitor? Why does the lowpass filtering effect get lost at higher frequencies?
using references wile mastering to get an idea of loudness, all of them renders from soundcloud. All of these tracks have a tail at the end of the eq. Ive tried everything to get that small amount of extra highs. I've tried thinning and widening, saturation, multi ban limiting with less on the highest ban, exciters, compresses, even bumping up the highest ban of my EQ to hit the very top and still no extra high end. So maybe I thought that my codec render was the problem, so I uploaded the track to soundcloud and re downloaded it off the same site I used to get all my other references and I still was not able to get it. Any suggestions?
...when a tower gets destroyed there is a very high beep not sure if everyone hears it but its there and it hurts my ears.
Wismec RX Gen 3. Like a very high pitched 'buzz', but very quiet. Doesn't matter which set of (3) batteries I put in it, it always does it.
EDIT: it only does it when the screen is on
Hi! I've just finished assembling my Bitx40, and when I turn on the radio, I hear a terribly loud noise (link to listen below). The radio works fine, because I can hear some operators behind that noise, but I cannot tune the radio loud enough to hear them properly, as the noise is extremely loud even on the smallest volume. I don't really know what's happening gere. Any help?
The noise: https://www.youtube.com/watch?v=1j0ywo45N7I
