A cheap strobe light for accurate turntable speed! 

Good to know!

Thank YOU for your feedback!

That is true, now that clocks do not depend on 50/60 Hz for accurate time keeping the power companies do not maintain the frequency as accurate as they did when we depended on our synchronous AC motor alarm clocks and business wall clocks to keep accurate time. The old rubber wheel rim drive AC phono motors also depended on it to rotate at a certain rpm. Power company induced wow in the speed as frequency changed.

er I'm calling you on that. Given its a fundamental part of how the power distribution system works, if there is a frequency mismatch even just between powerplants, it causes huge issues on the grid. For example in Europe the frequency is maintained even across countries, due to their interconnected grids and in fact countries that destabilise the network too much (we're talking 0.2 Hz [in the US I've seen 0.5 Hz being referred to] here) are cut off temporarily from the wider grids, until they can resynchronise with the rest of the grid. gridwatch shows the metrics for the UK over the last year and you can see its generally kept within .1 hz of the 50. gridwatch templar gives you a real-time dashboard of the current UK generation metrics. Can't share links here as it appears links result in my comment being deleted :(

The currencies are correct, just different prices around the globe. This video was done a minth ago so I don't know if by any change prices have changed.

@@anadialog thank you for your reply

Of course, I used my Kuzma disc

Nope, but that would complicate what is simple. Just rest it on something enough to let the light through. You aren’t going to find many true strobes and not at this price that is why I made this video. Otherwise there is always this alternative: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-_ug66WQAMeM.htmlsi=6Mnbjy8MgCmO2D7e

I see. Yes it is running slightly slow, you are correct. The EMTs are hard to setup. Gonna half to solve that.

Ya, you can check it, but if you have to do adjustments to the motor speed it is time consuming to keep going back and rechecking, and repeat the processes until it is spot on. Not practical, sorry.

So if the speed is not correct with this method how much do you adjust by? If you can work that out then you have to sit for another 3 minutes to check again. By the time you’ve done that I’ll have finished an LP side already 😂 totally impractical, you must have vast amounts of time to waste.

A made a comment in the video on this besides making a dedicated video also on the app. This is better, much more prices and useful to adjust.

True...it works!

@@anadialog no, it doesn't!! check your video material again! While filming a stripe has moved one position in both cases = speed is off. To be perfect on speed stripes got to appear standing still AND STAY IN THIS SAME POSITION!

Calm down it's ok. We're saying the same thing.

Should be the same if of good quality. The importance is the strobe frequency accuracy

Unfortunately Brexit is the answer to most of these higher prices...in any case try checking out eBay... P.s. it's not a torch it's a stroboscopic light. Try looking at other brands and the prices for a true strobo light....completely crazy!

@@anadialog Sorry but how could Brexit have anything to do with the difference in costs between the US and the UK? And a strobe light for engine timing costs around £12 -£20 here in the UK, thats less that half the price of this.

Well, all commodities raised in price in the UK due to import duties and the huge truck driver's strike that is still limiting supplying. It's in all the newspapers.

@@anadialog Firstly we (UK) has a trade deal with the EU, however bad it is for our fishermen and Northern Ireland but there are NO import duties between the EU and the UK and secondly the driver shortage is as bad or worse in the EU as it is here in the UK. So dont blame the propaganda you read in the tabloid press, thats just what the media owners want you to believe, try looking at the facts behind a story rather than taking everything you read in a newspaper at face value and you will be better informed. Blame high prices on the Covid 19 or the container crises that it led to if you like but that still doesnt account for the differential in prices between the US and the UK, the US also suffered from Covid lockdowns and their containers all being in countries were they werent needed due to port closures. The people of the UK are being ripped off.

😆

It says on the power supply INPUT 230v 50Hz, OUTPUT 15v AC 200ma. To me that means it is just using the mains 50 cycle as a reference. I was thinking it was quartz controlled frequency, doesn't look that way now. May as well just use a neon lamp and a printed up strobe disk.

@@zulumax1 Idk if the AC coming from the PSU is conclusive... The rectifier might as well be inside the lamp itself. I don't see the point of generating your own 50Hz frequency; the frequency of the power grid is very accurate - likely to be more accurate than an average oscillator used in consumer appliances.

@@QoraxAudio It does say 12v AC on the device itself. My guess is it is using that to run LED lamps. That would explain the low cost.

4:00 After watching again it does say 12VAC at the top of the device. Thinking about that I am almost certain they used white LED lamps which makes sense since a light emitting diode IS a diode it would only light on half of the 50 Hz cycle. This would create a clearer strobe image than a neon or fluorescent lamp which would dim only at the zero volt cross point.

@@zulumax1 Perhaps, but the ramp up and ramp down of the half sinewave makes visibility of the strobe bars an issue. Using a square wave makes LED turn on and off much quicker and that makes the strobe bars on the disc much better visible. So if that's the case, they probably have something like a zener diode in between that kicks in somewhere during the ramp up and cuts off somewhere during the ramp down. Or something similar... there's definitely more to it than just connecting a diode directly to a sinewave.

For R2R you need a calibration tape. For 78rpm just download and print what you can find on the web like vinyl engine

@@anadialog is there a r2r that has a speed control screw, like on some pick-up.

Yeah, most of them inside

I wish that was so. You need a stroboscopic light at specific frequency otherwise you will not see anything.

Yes, and to be sure of the frequency I use a digital test meter that reads AC line frequiency, as long as it shows your house current frequency at 60Hz or very near an incandescent should be fine, I also hear a neon lamp is very good but hard to find except for small electrical testers.