Measuring turntable speed the easy way - with the RPM app

[@Techmoan]

If you do try out the RPM app - it’d be interesting to see your results. Here are mine: Denon DP47F: 33.45 RPM +0.36% 0.11% w/f Sony PS-Q7: 33.55 RPM +0.58% 0.32% w/f Spinbox: 33.52 RPM +0.65% 0.73% w/f Soundburger: 34.80 RPM +4.68% 0.77% w/f

[@Hagledesperado]

Rega Planar 3 bought in the 1990s, no upgrades or services since then: 33.4 to 33.5 RPM. Mesaured with the free Android app RPM Calculator.

[@JuraiEmperor]

Techmoan I’ve been watching you for a couple of years (I was frustrated with my Philips DCC player and found you while looking for answers) and now my wife too is a fan. Love the topics, delivery and, yes, the puppets! Thank you!

[@The_Original_Cujo]

Rega RP40 +0.27% 0.19% W/F ... not too bad for a belt drive.

[@The_Original_Cujo]

Rega RP40 33.40 RPM, forgot that part.

[@Napster050]

Dual 521: 33.35 RPM +0.06% 0.13% w/f you can see this turntable on my channel :)

[@grantsgear]

Watching the RPM counter on the app staying in the relatively same position as the phone spins around it is kind of hypnotic to watch.

[@MrButtonpresser]

Made me feel sick! ; p

[@chaos.corner]

It needs to be centered on the screen though for if you want to put it over the middle.

[@timmowarner]

At the end of every Techmoan video I do a quick scan with KZbin to see if there are any puppets coming up. If there are, I keep watching and wait for them. If there aren't I like to read the comments while the music plays. I really like the long outro for that!

[@pianoluthier]

that's exactly what i did/ am doing!

[@me3333]

I'm glad I'm not the only one that does that

[@AirborneSurfer]

Same, indeed!

[@ynotw57]

Ditto

[@flamencopeko]

Yes, fantastic outro. Puppets?...

[@james-5560]

Techmoan is in my top 3 KZbinrs, really great content which is unique and interesting with high quality production and no annoyances. Thank you for what you do, you make a lot of people happy.

[@MrGeoffHilton]

Go on, tell us what the other two are?

[@numptification]

If you're like me it's 8-Bit Guy and LGR.

[@ThumpertTheFascistCottontail]

You spin me right round baby right round.

[@headstrument7657]

Good one

[@JAYCEEDOUBLE]

That Enter the Dragon record looks awesome

[@andriealinsangao613]

HI-YAH!!!

[@paulaj2829]

I used the app which you said about from the phone app store & what I found was a good idea was to get 2 pieces of foam & place on the Turntable each side of the spindle then put the phone on top of the foam & that worked a treat.. Thanks for the info on the video again.

[@sandqwert]

I do not have an iPhone, I don't even have a record player but still liked the video. I watch your videos because they are very informative and very well done, keep up the good work as always!

[@Tecstar70]

How does anyone dislike a Techmoan video? I never understand it!

[@o_guguito]

What you should understand is that a "dislike" is as any good for the youtuber as a "like". It's a "reaction". If some jerk wishes to do some "harm" to the video, he shouldn't click either. :D

[@Tecstar70]

Yes I get that, it just doesn’t make any sense! 😁

[@novastarproductions]

Every time I get a notification that Techmoan has uploaded It means happy times!

[@thefrench8847]

band of misfits yup, true!

[@Daniel_de_lux]

your life is booring???

[@novastarproductions]

Tarot Marsella Esoterico no, far from but when I have some free time I love watching Technomoan.

[@chrisb6003]

Tarot Marsella Esoterico That's "boring". And besides, what are you doing here if you think that?

[@NewtHew]

I don’t even own a Turntable, nor am I thinking about buying one - I still watched all of this video! Just find your videos very interesting and I find the simple way they are presented, no fluff, very endearing. Great channel.

[@dinamitemaster]

My turntable has a built-in stroboscope with a light illuminating the edge of the platter which has the rings. Very useful feature, as it makes it trivial to always have the speed bang-on and make on-the-fly adjustments while playing a record.

[@JonniboyV2]

Love that feature on mine as well. They solved this in the 70s already haha!

[@simongreenidge6454]

Around 1982; I remember a friend's family's Pioneer turntable with a little red built-in strobe and those black graduations on the outside edge of the platter. There was a knob to allow for easy fine-tuning of the speed.

[@GlitchyBastard]

Who designed this app must be a genius, the sensors in nowadays high-end smartphones are really precise, way more precise than cheap laser rpm meter.

[@ceptabil]

That guy who made this app ":D"

[@GlitchyBastard]

You're a genius, harry!

[@volvo09]

It is amazing how precise the gyro sensors in phones are... I don't doubt that the results are quite accurate just by seeing in other areas what these sensors are capable of "feeling".

[@veteq101]

I didn't know about the app, very useful. My VPI is running at 33.33

[@freesaxon6835]

Techmoan ....... has become a KZbin Star ........ from the early days of getting back on his motorbike to STARDOM !!

[@dannyrodriguez5420]

The app is very accurate. I also use the “stop watch” method, where I literally use the built in stop watch on my phone to verify the app. So a track say listed at 3:20 plays for 3:21 is playing at .31% faster and then compared to the apps results for accuracy.

[@lululombard]

I have to say that I'm impressed!

[@HistoricaHungarica]

Now we need an app to measure how accurate the SoundWagon is. :)

[@WhiteBoxProductions]

I bought one of these Chinese RPM meters for checking the spindle speed on a lathe and I totally agree: They are rubbish. They do everything but measure the correct RPM. They just throw random numbers around which are nowhere near the real RPM. It's better to get something more expensive (~100 pounds ) if you need to measure RPM several times a year. On my lathe, I ended up installing a hall effect sensor which works great and only costs a dollar or so from China.

[@GRBtutorials]

WhiteBoxProductions Or make one yourself! You only need a laser, a receiver, a microcontroller and a screen. Oh, and you also need programming knowledge.

[@d2factotum]

Looking at it, I reckon the problem might be that the record you've got the tape attached to is quite glossy and obviously has a textured surface, so you're getting a lot of random reflections as it spins. I'd be interested to see how reliable one of those is if you made some sort of matt black disc with a reflective line on it to use for measuring.

[@WhiteBoxProductions]

Why make on myself if they are readily avaliable for affordable prices. Also, I got none of the above.

[@talshayar4279]

@d2factotum This is exactly the issue. I have a different but equally cheap Chinese rpm measurement device that works perfectly, but only on completely matt surfaces. Just tried it using an LP which gave me the exact same results as this video, but when I placed the reflective tape on the black rubber matt, I got a 100% stable 33.3 rpm reading. Mine was originally bought for setting the spin speed on a washing machine for which it has also worked flawlessly.

[@GRBtutorials]

If 100 pounds is affordable for you, good for you. But other people's budget (including mine, I wouldn't use it very much) isn't that big.

[@simonmacomber7466]

Thanks for the review of this app, now all I need is a video giving suggestions for someone who is new to the world of buying turntables, and which ones are worth getting opposed to which ones aren't.

[@wintermute5127]

What an excellent video. I have a Technics SL-10 that I've just restored. I didn't know about checking the speed as it's my first record player in a decade. Thank you.

[@inerlogic]

I bought a second-hand all in one record player system from a friend of mine, and I picked up "Pink Floyd: The Later Years" double record set.... i've been listening to Dave Gilmour sing for 45 years, I could tell the speed was off. I downloaded an RPM app from the Android store, the free version does 33, 45, and 78. Though at 78 my phone flew off the platter... no rubber mat.... Turns out the player was running about 5% too fast, got the screw driver out, got the speed sorted, Dave sounds great now.

[@danielarick2105]

When calibrating the speed on mechanical, acoustic machines, that best way to do it is by placing a piece of paper under the record and count the revolutions to set the speed, same can be done on cylinders as well

[@nevet1212]

Thank you so much for posting this. I just got a second hand record player as a gift that sounds like it’s running slow and now I can know for sure.

[@bansheemania1692]

My old Technics turn table from mid 80s, has Orange lights around the turntable and adjust the Fine adjust knob to slow or raise RPM. Pretty hypnotic and cool looking.

[@JMG72ARG]

You saved me a giant hastle with the little app. Just turned the vr screw and issue was fixed... it was running 4% slow, now got it to 33.3, just 0,11% off and wow of 0,13%. Sounds good to my ears now.

[@flamencopeko]

Probably my fave Techmoan video. So many good points and ideas here. I'm very interested in RPM and BPM.

[@C6438911]

This is one of the best channels to find on youtube. Techmoan thank you very much! Vintage or 20+ years old equipment is better in build quality and with audio the sound is also better or at least as good as modern new equipment. Although a nice combination of old and new could work as well at times. I mean for instance old televisions, no matter how good it is, it just lacks the modern connections and resolution (4K / wide screen and such) and even quality might be inferior to new televisions. But from a history standpoint and how old equipment used to work it is still very nice to have one ofcourse.

[@pantslangford1976]

Got an old Thorn 428 Solid State Record Player made in 1975. Bought it second hand took a bit of a chance and amazingly it's measuring +0.7%. Happy days.

[@middleclassic]

Techmoan : Yes I did try it but I did not purchase it. But I do own a turntable very similar to your turntable. I own the little brother / sister to your DP-47F, the DP-37F. I have owned this turntable purchased new in 1986 and do not recall ever having to have it serviced for any reason. So I was happy to see that when I tested the reading I reliably got from the RPM app was 33.39 +0.16% w/f 0.10%. And yes, mine is quartz lock also. And I absolutely love my turntable too :-)

[@TalenGryphon]

Can confirm. Compact flourescents do not work for stroboscope disks. My desk lamp just lit it up. Fortunately the crummy old flourescent in my kitchen works for this purpose, but because its bolted to the wall I did have to have my record player unnervingly close to the sink O.o That app work worlds away better tho. Even determined that I have excessive flutter and need to crack the turntable back open and go through the resistors. Thank you for letting us in internetland know about them

[@thinlizzysupporter]

Just tested my Audio Technica AT-LP5 direct drive turntable. Reading 33.41 +0.22% happy with that 😊

[@magreger]

I enjoyed this

[@jamesm90]

Technics SL-1210 MKII - 33.38 RPM w/f +- 0.03%. This one was made in 1989, a 30 year old TT, these 1200 series really do deserve their reputation for excellence.

[@sonorangaming449]

just finding this video, and it answered my question about using a TT weight on my Denon 52F

[@NotEliteGamer]

I've been using this app for two years now, it's decently reliable

[@austinallmond7211]

The last time I used a tachometer to measure the speed of one of my turntables, I used one with a direct contact feature that uses a spindle to directly measure RPM. It provided a more accurate reading than the non-contact retroreflective method since a turntable's speed is close to the minimum measurable speed by a retroreflective tachometer.

[@El_Smeghead]

My dad owned a Marantz hifi in the late 70s which had those strobe markings built in on the edge of the turntable.

[@Wildernessoutside]

I've been using this app for a few years ,tbh its really good

[@StarkRG]

I love it when people find new uses for these multi-sensor devices we've all got nowadays.

[@aspectcarl]

Brilliant! I was looking for something for my old dual cs505 and found rpm on the Google play store, never considered using my phone for something like this other than trying to strobe the led at at 50hz which didn't work too well on my old phone.

[@VGScreens]

Hey TizzleMizzle, I know the puppets were a huge effort, but just so you know I was a huge fan. Love your work :)

[@swanseauk]

That has to be THE coolest picture disc I have ever seen..............

[@eduardoavila646]

Another possible way is to put a sheet of paper, cut to be the same size as the disk. Then put a dot or a risk in one part of the paper so you can see when it done one turn. Now record with any camera for 1 minute. And count how many times the disk turned using the dot or risk you made in the paper as a reference. If the speed is too fast for you, just reduce the playback speed, many third party video players allow that, both in android and windows (android examples: mx player, vlc, etc) (windows examples: media player clasic, vlc). You can also use any video editor, as vegas (paid), kdenlive, blender, shotcut, premiere (paid), lightworks, etc, to decrease the video speed, even tho any decent video player should do the trick. It wont aways give a precise speed as 33.26rpm, but a good idea. So if, lets say it runs at 33rpm, but in the end of 1 minute, it dint complete the 33th turn, its too slow, if it passed a bit its too fast. Of course there are other many better ways to measure that, but in a emergency or any specific situation that tecnique may be usefull. I've used that to make a homemade turntable and make its speed right to playback a cheap disk, for a school science project.

[@scottplumer3668]

I've done something similar where I find a song with a definite start and stop (not a fade out or segue) and time it. The longer the song, the more accurate the timing.

[@JohnnyParanoid]

New Techmoan video day is the best day!

[@DavidBrown-zp5br]

My father has a turntable with a system like this worked into the front with an angled glass panel, some (I'm assuming) LEDs, and a little turn-wheel to adjust the speed of the light. Get the light to look like a solid line and youre good to go!

[@tonybuttifant9422]

I have to say I thought it was great, I love watching your videos, I had been wondering how to check the speed on a wind up gramophone which has absolutely no calibration marks on it, being made in the twenties. Counting with a stopwatch was possible but difficult. After seeing this, I downloaded an android version which just shows the speed orientated to the viewer, works perfectly, and showed that it was not out by very much. Obviously wind up gramophones have a lever to adjust speed via a governor so was easy to adjust. thanks for the tip

[@catfish552]

What a brilliant idea. Thank you for the video, I would never have known this existed.

[@DutchNostalgia]

You should not trust on the RPM app…. I tried this for a long time last few days and noticed that it is everything but accurate, on multiple phones it gives different results. What I did was, I was measuring the accuracy by putting a Newer record like 1989 taylor’s version next to the digital version and listened how much they stayed in the same tempo. This because new albums will be digital put on to a record… This helped me determine what speed to set it to. Now it’s only like 0.005 behind on the digital. So I am happy with that method.

[@TheSiftyzod]

Thanks heaps for that just tested that out on an old turntable i have just finished restoring and it was reading at 33.34rpm.. so least i know i got it pretty much spot on .. legend

[@zeerust2000]

Or........get a recording of Beethoven's 5th symphony and adjust your turntable until the first three notes are in tune with G natural. You should be able to get a reference tone from an app, a piano, or a good old fashioned tuning fork.

[@georgebliss964]

I also set the RPM to 33 1/3 by counting 100 revs in 3 minutes, using the strip of white paper and a stop watch. If your timing is between 2.59 and 3.01,then you are good to plus or minus 1/2 per cent. This is accurate enough for me,since on a 3 minute record track,a second either way is not noticeable.

[@michaeltache3681]

Thanks for that. I’m trying this before investing any money.

[@PEMAMETAL]

Thanks bro! I have a Regar PLannar 2. I tried 2 different apps. 1 gave me the result of 33,70 te other 33,90. But counting 100 BPM in 2:59,84 gave me the result of 33,36 which seems way more accurate than any app.

[@GroversMill]

I learn so much from these videos. TYVM Techmoan

[@PirateNovelist]

Good to see there’s another good app out there for this. I currently use Turntabulator. I might have to check this one out as well so it can act like a second opinion.

[@Eytaris]

Hi Mat! just a bit of knowledge on the laser tachometer. they tend to be absolute garbage at low speeds, especially the cheap ones, because of the refresh rate and the holding position, if the laser beam is not perpendicular to the tested surface and/or you move during the test, you will have incorrect values. the best way to test any rotation speed, is using a decent tachometer, with a dampened spindle that limit the force you put on the surface (a turntable spindle for example) but help the head of the tacho to stick on the surface. Thank you for the videos!

[@xboxandthat]

From watching all of your vids I've finally gone out and bought a proper turntable :D The Audio Technica AT - LP120 Black. I know you probably prefer the original equipment but bloody hell does it sound great.

[@Vanessa_Santillan]

Very neat! Thank you for the demonstration!

[@spruce2759]

I use my video camera on my phone, set to slow mo. works in any light setting just point it at the strobe markings on the platter works perfectly.

[@FreazyTek]

I already own this app and must say it's one of the best apps for tt,thx Matt for spreading the word ;-)

[@maxmuster2898]

My RFT Granat 227-2 has a built in scale underneath the plate and a strobe light with a mirror, which is really handy

[@SuiYo]

I don't really know much about turntables, but why can't there just be a test record that plays one constant frequency and the output of the turntable (auxiliary) is hooked up to a device that will say how fast the record is spinning

[@olipito]

Sui Yo yes, there is, the problem is that they seem pretty much out of stock everywhere.. Ortophon and clear audio made one.. But it's pretty much impossible to find one.

[@HawkOfGP]

Sounds like even more effort than the stuff that already exists.

[@SuiYo]

Oh shit it's VWestlife! I love your vids man.

[@johnfrancisdoe1563]

Sui Yo The stroboscope pattern works with nothing but the lamp that shines on your record player anyway. No annoying tone, no laser, just the pattern on the turntable and the reliability of your nationwide power grid. Becomes routine glancing at it when using the player. In the 1980s it was popular to engrave the pattern in shiny aluminium or steel on the edge of the platter so you could watch it while the music was playing.

[@Vode_ika]

And it's still done on record players made today, and with a light built into it. www.google.com/search?q=stanton+turntables&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiV3pGVs8PcAhVN1IMKHRc4CoMQ_AUICygC&biw=1920&bih=974#imgrc=tWCKiZmlZinBZM:

[@Tjita1]

Kenwood P-100 (plastic cheap turntable, but sounds surprisingly good), before adjustment ~35,9 / 46,7 rpm. After adjustment (for the first time since my dad bought it new in 1994, access holes holes for the trimmers on the bottom) 33,35 / 45,01 rpm, w/f ~0,6% across the board, would probably be significantly less without the phone on the platter. Also, we not only have the same phone, we actually have the same cases on them too. Cool.

[@purplefuku]

This is great! I love your usual content, but I’d also love to see more app reviews that tie in with physical objects in the future!

[@DavidFell]

I've been using a similar app, Turntabulator, for years. It doesn't have the logging feature or detect wow and flutter, but it's cheaper than the paid version of RMP, and gets an accurate reading of RMP.

[@onedeadsaint]

4:15 "a pinch of salt" thank you using that term! grain of salt is just plain wrong!

[@Fake_Blood]

Was half expecting a muppet rant on free apps at the end there.

[@daveb5041]

*Incandescent don't flicker do they?* The filament takes longer to dim them 1/60th of a second providing flicker free light. It may dim very slightly but not pulse like a metal halide lamp.

[@diatonicdelirium1743]

Just point your phone camera at it and you'll see!

[@RichardDzien]

I have one of those laser based counters, and can confirm they are a bit rubbish at slow moving things. it's much happier at speed. It would work well with the strobe discs. Just count up how many stripes there are in a circle and use it with the laser counter held at 90 degrees to the disc, then just divide through by the number of stripes on the disc. You should be able to get a fairly decent % of accuracy that way too.

[@ZappoB]

Very fine app tip! Thank you very much. 👍🏼

[@kevinatkab5219]

I think optical strobe discs are more sensitive to small changes in speed and you can see the drift quite easily with them. Hard to do that with a digital readout that is only sampling the speed maybe 2-4 times per revolution.

[@slyslaughter5115]

This was helpful. Having gone through 3 ProJect turntables, all of which clocked in at unbearable 33.80 and 43.30 speed, the app is indispensable. I used the strobe too, but the app is easier. Now onto a different brand. I am fed up with Joni Mitchell sounding like Minnie Mouse.

[@robbpeppertree]

I picked up a Linear Tracking Sharp RP-113 which need to be cleaned up, and need a new belt. There's a store that specialises in old stereo equipment in my city, but the service tech there used a 50Hz disk to test. In North America, our power is 60Hz, so everything was too fast. I ended up using a record with a pure sine wave, and "tuning" it to the new belt. I used an Android equivalent app and checked to see how well I did: Sharp RP-113: 33.64 RPM +0.91% 0.16% w/f

[@willrun4fun]

Sweet! I'll be checking this out.

[@LogiForce86]

I have bought a strobe disc, I used an app but at the end of the day I prefer using a digital source (CD, streaming service, etc) and play a copy of the same song from the same album, and simply using my ear to listen to the beat of the drummer. If I hear the record going too fast or too slow compared to the digital source, I adjust accordingly. Reasons for this choice: 1) Using an app... phone can bump the tone arm with horrible results in terms of scratches 2) The weight of your phone will cause drag as the motor you are adjusting will thus run too fast, as the weight will slow the platter down. So when you put a normal record on it'll play too fast. 3) A strobe disc doesn't account for the drag of the stylus in the grove of a vinyl record. 4) A strobe disc isn't made of vinyl and thus doesn't bite into the mat on your platter in the same way. (mind you also need to adjust speeds as you change mats)

[@vivalesvegas]

One of my GL75’s came with a small strobe disc. I used a strobe app on my phone and found that it’s running ever so slightly slowly. I can adjust the speed on it by just moving the speed selector slightly, it the preselected positions are so close, it doesn’t matter too much. With such a heavy platter, I don’t think there would be much wow and flutter, but I might get the app just to check it.

[@DrRChandra]

A turntable my father owned had a slanted (conical) shape, with a black background and silver rectangles, and a neon light to provide the 60 Hz light pulses. And it had two wheels which jutted out of the top, one to fine adjust 33 1/3 and another 45.

[@e28forever30]

Could be a Sanyo. Mine has the strobe and the adjustment wheels for both speeds. Pretty handy!

[@vencibushy]

You can check if the PRM meter is accurate with a test record that has 1kHz and a frequency meter and/or oscilloscope with a built in frequency counter.

[@bsadewitz]

You could also download an accelerometer app and secure the phone to the turntable in some manner. Then, start the app, which graphs the data in three axes. There you go. You could also use the phone as a strobe with one of those discs. There is also the new Google Augmented Reality platform, which could do this just using the camera. As a matter of fact, it might be able to sense the fields of the motor with the magnetometer. If it can be a compass, it probably could pick up the motor.

[@SergiuszRoszczyk]

I don’t know why but in times (actually for at least 15 years) when 8 pin AVR microcontroller paired with dirt cheap quartz crystal and tiny LED encoder (available since at least ball serial mice) and an PWM MOSFET motor driver precision turntable drive is something “special”... Anyway great review or better say, walk through the app and interesting video, as always :-)

[@Hyxtryx]

I have strobe dots on my turntable, so I just look at those. But I wanted to be able to tell what % fast or slow it is by observing how far the dots "walk" in a given amount of time. So I worked out the formula. If anyone is interested, here it is: PFAST = 100 * DOTS / (SECS * DCIRC * RPM / 60) PFAST is Percent Fast RPM is RPM... like 33.33333, etc. DCIRC is how many dots are around the circumference for that RPM. DOTS is how many dots it "walked" clockwise in some amount of time. SECS is that amount of time in seconds. My turntable has 216 dots around the edge for 33.333RPM 60Hz. I think the strobe disk in this video does as well. So if it takes 2 seconds for the dots to "walk" clockwise one dot, then PFAST = 100 * 1 / (2 * 216 * 33.333 / 60) = 0.41667% fast. Since I'm digitizing my vinyl, I strive to get even better than that. I try to adjust the speed so that it takes at least 5 seconds to walk 1 dot. That would be 0.16667% fast. Then to figure out how much that changes the length of a song: TIME1 = TIME0 / ((PFAST / 100) + 1) TIME0 is the length of the song as written on the album cover. TIME1 is the new length of the song due to your turntable speed. So if PFAST=0.16667 and TIME0=300 (5 minutes) Then the new duration of the song would be 299.5 seconds. Close enough to perfect for me. 🙂

[@zulumax1]

You have to calibrate the app to read 100 revolutions in 3 minutes. Go into settings by clicking on the gear icon in the top right, then calibrate at the bottom of the next screen.

[@Fluteboy]

There aren't many apps that I will end up paying for, but RPM is one of them. When I run my Dual CS505 it looks stable, but the app tells otherwise!

[@alexatkin]

Hard to say if putting it over the middle makes much difference as surely it depends on where in your phone the sensors actually are and if the app is already internally compensating for positioning (presumably it is as it knows exactly where the phone is in 3D space).

[@EspHack]

You need to hold the laser gadget absolutely still for it to be accurate at such low rpm, get a tripod or something, any movements will throw off the measurement

[@arbutuswatcher]

Entertaining & Interesting as always. My kids asked for more muppets! :) Keep up the awesome reviews.

[@romandjma.recordplayers7806]

Worth it watching at 3 am. (This video isn’t the reason I’m up at 3)

[@AsbestosMuffins]

you need 2-4 stickers placed equidistant on a laser tach, at least the one I have at work which was a little more expensive id guess, you can also use a contact tach which just tells you the rpm from the spindle

[@mikeos1]

My 40 year-old Thorens TD124/2 has illuminated strobe built in to the turntable.

[@fellipec]

Very cool app

[@RobertKohut]

Great for testing TT with strobe speed adjusters to see the accuracy of both the app and the strobes.

[@SinsBird]

For the laser RPM meter the surface has to be not reflective.

[@ookland81]

I down loaded the app and give it a go. Even shared the results. (Sony PS-33) Good app I thought so I decided I would pay for it. Well that was until I saw how much they want.

[@jjeshop]

Fantastic!

[@icebob8555]

Cool thanks

[@Ijdgafam]

Oh very nice app you spin me right round baby right round 😂

[@headstrument7657]

If I were only 1% as cool as Techmoan...

[@Tigrou7777]

3:03 you can measure RPM same way using a hall sensor with magnet and an Arduino (or a photodiode and the white strip)

[@chaos.corner]

I was watching some old Techmoan videos yesterday with some old tech doing cool stuff with vinyl and he bemoaned how most record players these days were pretty basic on the features and it made me wonder what records and record players would look like today if vinyl had not been replaced by CDs and later digital media. Built in frequency counters? Every deck would have dynamic speed compensation. servoed styluses to prevent skip, anti-scratch technology. Hi-def albums on 7". Encoded track names. What would you expect to see?

[@bharatsinhrathod8800]

very nice