They can. It varies by person. You should ask your doctor about your case.

* The laser breaks up the rear part of the capsular bag. * I don't think the 2 surgeons communicated. One is considered the local expert, the other just another ophthalmologist. They have their pecking order. * The wrong model choice was based on the measurements. So measurements are the input to the model. If the measurements are confusing to the doctor, and they are randomly trying to fit one model to them, that's a warning sign. * The second doctor used laser interferometry during surgery, after the natural lens had been removed. At this time, this seems to be the optimal solution.

"Thank you very much, it's very low quality but you can still hear little things, I didn't know that you could make sounds from the smallest, finest wire spools😅😅"In fact, it should be pretty clear in at least 1 station. It will depend on the station and your antenna and the build of your radio.

Basics on a transistor: kzbin.info/www/bejne/raGtaauar5ikaKc kzbin.info/www/bejne/ZnrLpquMZq6Kq5I

@Epistemesis Thank you. No reason not to combine the two! Best of luck in your studies.

I have a video on common problems: kzbin.info/www/bejne/oXTbgmufhbaratU Try those fixes. Let me know if you still have a problem. Your coil specs are close enough it should get something if you have a good antenna and AM stations in your area.

@charleswells9682 Yes, in fact I've bought/built a couple low power transmitters, but they did not have enough power. I've tried modulating my frequency generator with no success. Still on the table, but since I self fund, replacing 2 broken cameras got top priority this time around.

@marytymoshuk7176 I'm a graduate of the school of hard knocks. ;)

True. I have mine grounded. Also lightning ground is important.

@@tsbrownie good point, I have a combiner fuse box I lightning ground and it is surge protected.

@@Pygar2 I have a video on putting a 14 pF to 365 pF variable cap between the radio and antenna.

Wooden block? I have a 3D printed radio video and links to files on thingiverse to make them.

3D printing could work well making the housing also the former for the coil.

@kensmith5694 I have 3D printer files for crystal radios. Just add the coil core and metal parts. One has a built in cat whisker.

Spoiler: I'm strongly suspecting the coil diameter is too small. I know that Q (efficiency) increases with diameter, and I think it must decrease to the point with smaller and smaller cores that it's just too inefficient to work from the micropower coming down the antenna.

@@tsbrownie Well, looking at wikipedia, inductance increases faster with coil diameter than capacitance. So that appears to be it.

The bobbin seems to be acrylic, which should have little effect on the inductance, but it's hard to predict what kinds of plastic will interfere with the inductor. You might need to 3d print a bobbin to test against. A printed one would also give the advantage that you can make the divider only 1 mm and exclude the separation distance of the 2 halves as an additional trouble spot.

@@franzliszt3195 Yes, since you are keeping the wires further apart, the large diameter coil tends to have less capacitance. L = (0.2 * A^2 * N^2) / (3*A + 9*B + 10*C) where: ^2 means squared A is the diameter in inches of the middle of the winding B is the length in inches C is the thickness of the windings (Former surface to top of windings) N is the number of turns. L is inductance in uH For a coil that is more than 3 times longer than its diameter, increases in diameter increases inductance faster than linear. This equation seems to have always been good enough for me.

@@franzliszt3195 See my comment with equation below. Somehow youtube did a thing an put my reply in teh wrong place

@rogervaught3985 Thank you. I just replaced my 2 worn out Lumix GX-8 cameras with 2 Lumix GH5ii cameras. They record in 4K. You can tell videos prior to the GX-8s by the much lower resolution. For sound recording I originally used the cameras and again you can hear the lower audio quality. My first recorder was a DR-10. Towards the beginning of 2024 I switched to a DJI Mic version 1.

@SmartySmarts There could be several reasons including cables that are too long or not rated for POE. There might be high resistance points at cable connections or other because of corrosion. The supply may be defective, too small, or have too many things drawing on it. Etc.

@@tsbrownie all new, no corrosion, correct type and length.. assigned channels helped a little but still poor

@@J123G Very kind words, thank you.

I think your comment got cut off.

@@tsbrownie You're right. The last sentence should have read "my earpiece is a high-Z crystal earpiece from a commercial crystal radio kit." If you want more details on the "single-inductor, capacitor coupled", design, I could send an email if I had your address. I'm at "lathechuck (as shown in my photo)", using a popular email service (if you care to guess).

@cdorcey1735 My email is in the "about" on my channel. I'm always interested in new designs. Thanks.

Not really. It would make the spacing between the wires too much and it would change the coil properties.

@Dark_Matter2 It has to do with impedence matching, and I don't know how to calculate / measure the input impedence of these crystal radios. You can always just give it a try.

@tsbrownie I can add 5 meters of coaxial cable between my antenna and radio, I can compare volume with and without that cable, with connected gound and without ground

@Dark_Matter2 That's a reasonable test.

The impedance of a coax cable will be either 50 or 75 ohms, which is much lower than the impedance at the end of a long-wire antenna. If your outdoor antenna is a wire dipole, then it should drive the cable efficiently, but then your radio needs to be designed to match to the cable impedance. That means relatively few turns (like 1-4!) on the antenna link coil. Or, design for a tapped-C feed in to the resonator. (I'm driving a tapped-C crystal radio with 50-ohm cable to a dipole antenna that I use to transmit on the 80m amateur band; seems to work.) By the way, if you have a dipole antenna, you don't need a ground. The signal voltage is between the center and shield of the cable, not between antenna and earth.

@detaylor7 I'm functioning OK. There is still a fuzzy zone and depth of field issues, but they are relatively small inconveniences. The measurements you'd have to ask for and pay for. Are second opinions worth it? In my case it would have been, but for most not.

@@tsbrownie do you ever wear glasses or contacts?

@@detaylor7 I need to wear them if I have to have depth perception (driving, hobby work, etc.)

@noads1035 Just bought it online. I can't remember what I searched on. Something like "ferrite tuning slugs" or such. Yes, I just checked and that search works.

I'm re-discovering that.

@aaronwoodard3354 I have tried standing the fine wire coil on end and did not notice any difference. I mentioned in another video that coiling up the antenna and ground wires like that can change the circuit. Usually, it's a slight decline, but every once in a while, it helps or at least makes no difference. I have the extra wire so I can move the radio to my other bench.

@cmartinez0914 Glad you liked it.

@ not just “liked it“ I truly appreciate your wisdom. Thank you so much.

@franzliszt3195 Sure, OR that's extra wire that leads outside to the antenna under the eaves of the house. ;)

No, but I just ordered some, so we shall see.

The resistance is about 6x in the 0.227mm 31AWG wire compared to the 0.81mm 20 AWG wire. May not be enough power to properly drive the earphone.

@kensmith5694 Interesting information, thank you. I have been trying different coil / slug configurations, but can't get more than a 10 to 20 percent change in inductance. That's not nearly enough to tune in the AM band. Did your rocket radio have a small cap, like 3 pF?

@@tsbrownie Points at coil you can't see Points at slug you can't see 10.88mH without slug 61..55mH with slug Yes, it has a huge number of turns on it. Also, this is not enough range to do the whole dial. We need Range = 1700/500 = 3 is close enough F varies 1/sqrt(L) We need 3^2 = 10:1 close enough I may investigate further but a switch and a capacitor may be a good idea. ********************** Merry whatever you do to all who may pass this way

@kensmith5694 Or multiple coils you can select.

If they have metallic plating, it won't work. I do have some snowflake shaped spider web coils. There's a video and it has 3D printer file links in the description.

Yes. That was my idea too. It should lower the capacitance but it is harder to make such a winding.

It will drop the capacitance in the coil but I don't think it is a needed thing for the AM band. The tuning capacitor is huge compared to it. Scramble winding also decreases capacitance because there are gaps between the wires.

Like a bifilar "Mystery" set!

@@Pygar2 I also know that for making a coil with thick wire, using wire rope can work nearly as a well at litz wire.

@@kensmith5694 I have to wonder if putting a var. cap. between the antenna and bobbin would lower capacitance.

I've greatly enjoyed these various experiments with different wire gauges and types of coil forms so much that I ordered some #31 AWG wire and the plastic sewing machine bobbins to try the experiments for myself. I had the 1.65" diameter PVC tubing already. The wire came earlier this week but the bobbins only finally arrived today. I wound the bobbin using the #31 wire, trying to use the same technique with the variable speed drill and moving the wire back and forth on the bobbin. I didn't measure the wire, just wound what I thought was enough. The turned out to be over 1000 uH so I had to unwind quite a bit, I first got down to 513 uH and tested that--that had way too much inductance to cover the MW band (It wouldn't tune above about 1100 kHz) so I unwound more turns and finished with 222 uH which worked fine. I am extremely fortunate to own an HP4342A Q meter so tested all the coils on that--its variable cap goes from 20-470 pF. The bobbin coil at 550 kHz had a low Q of 17; at 1680 kHz it had even lower Q of only 8. As the video showed, it didn't receive anything in the crystal set. I then wound a PVC coil with the #31 wire, trying to emulate the small coil used in the video--my coil ended up with 203 uH. At 550 kHz it had a Q of 121; at 1700 kHz a Q of 83. As the video showed, this one worked moderately well in the crystal set. I wound another coil with #20 wire on the 1.65" dia. form, this had 221 uH. At 550 kHz its Q was 181; at 1700 kHz the Q was 276. This is unusual in my experience to have a Q that has a much higher Q at the top of the MW band--this is good! As the video showed, this is the reference coil for the crystal radio. (I used the DER DE-5000 LCR meter at 100 kHz test frequency for the inductance measurements.) Lots of fun doing my own tests and my thanks to TSB for doing these experiments and showing us the results that motivated me to do some tests of my own!

@steveratzlaff Thank you for posting your results. The confirmation of one's results is always a good thing. I'm envious of your Q meter. I'm looking into a new LCR meter, but even those aren't cheap.

@steveratzlaff Spoiler, I just finished a scatter wound coil on the 1.65" pipe that is 7mm long. Total wire length, including 1.3x for scattering, was 9.36 meters. It was a bear to wind (and rewind multiple times). We shall see. I think I might also try a straight wind on an 8mm diameter core like the bobbin, but it would have to be 20 cm long!

@@tsbrownie Should I assume you used the #31 wire for this new coil? If not, what gauge was used?

@steveratzlaff Yes, 31 AWG.

Yes, the D9K works. I was made in Ukraine. kzbin.info/www/bejne/ppmnkGWNopxsndU You can also use galena or iron pyrite if you use a cat whisker: kzbin.info/www/bejne/hoKTlJ-Nmp2Bfbc kzbin.info/www/bejne/d3_YhmudqKZ_sKs