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Yi 2 - Best Budget 4K 

Gitup Git2 (My Pick)

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Yi Ultra 2.7K
Mobius (also works as a Dashcam)
Polaroid Cube+
Drift Ghost X

My favourite USB battery power Pack

This is the excellent USB power pack I use when I travel.

2 x 2.1amp outputs. 8400mAh capacity.

Two digit Led display shows battery level


What SD CARD should I buy?

If you want an SD Card for your camera - these are the ones I use and recommend. 

I'd strongly recommend not to buy any SD cards off ebay - I've heard about too many issues with counterfeit cards - often sold on by unwitting resellers. My inbox regularly gets messages from people who bought a £150 camera then cheaped out and bought a £3 memory card on ebay - Then when it doesn't worth they blame the camera! It doesn't make any sense. Good memory is cheaper than it's ever been - see the links above.

A lot of HD cameras will not work properly with cards larger than 32GB (cards over 32GB are usually SDXC rather than the SDHC standard used by 32GB cards. SDXC cards use the ex-FAT system rather than FAT32 - in short they are a different standard). - so don't just buy the biggest card you can afford - read the specs in the manual to see what it accepts.


RECOMMENDED CARDS (for action cams - see dashcams below)

CLASS 10 UHS-1 CARDS (For HD Cameras)


U3 CARD (For 4K cameras)




The SD card in a dashcam is re-written over, more frequently than in other types of cameras. Some manufacturers void their guarantee if an SD card was used in a dashcam. So, no surprise, there are special High Endurance SD cards made just for's some.


VERY IMPORTANT. These links take you to the product, however Amazon have three different ways of selling. There's Amazon Direct - This means that you are only dealing with Amazon themselves, then there's other sellers that use Amazon's facilities - these show as Fulfilled By Amazon and finally there's Market Place sellers that advertise on Amazon, but operate independently.  I strongly recommend that you only use the first...the Amazon Direct - Sold By Amazon option. Even if it appears that you are paying a couple of £/$ more it is more than likely you are comparing the price of a real item against the price of a fake.

To give you an idea of the extent of the fake goods problem. In a 2016 survey by Apple - 90% of the 'Apple' chargers sold through Amazon - using the other the two methods..which includes the "Fulfilled by Amazon" option -  were found to be counterfeit....90%! 

« Time for a quick nixie tube video | Main | Review: Feiyu Tech Wearable Gimbal »

CX Discs - Better, Worse & The Same as a normal record

CBS envisioned all records made after 1982 utilising their CX encoding system, but if you've bought any music on vinyl since the mid 80s, you won't see a CX logo on the what was CX and what went wrong. Watch this video to find out. 
As always there are some great contributions in the comments - especially this link to a DIY CX decoder kit.

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Reader Comments (16)

Great video! CX! ;) I completely forgot about it, except for analog sound on early Laserdiscs!
(Which used a modified version of CX)

Found this:

A DIY CX encoder!
Here's the complete issue:

So it sems your RS120CX have the 3-chip CX solution as you pointed out in the video. eg. 3 op-amps IC's, one (the 13700D ) a bit unusual... TL084 is industry standard op-amps.
Would be fun to see which CX design board they put into the direct drive RS220CX!

Also, the CX line output of the Telefunken players needs to adjusted if a new pickup or different brand is fitted, normally the Audio-Technia AT-72K was factory fitted. This is according to the manual and a german Forum I've found.

October 19, 2017 | Unregistered Commenterpinswede

Great video as always!
Ok, this doesn't have anything to do with it, but after watching it, I've thinked about TECHMOAN!

The console of the car! Am I the only one who thinks it's... beautiful!

have a great day everybody!


October 19, 2017 | Unregistered CommenterClaudio

CBS patent for CX system:

More nice info, albeit in German:

October 19, 2017 | Unregistered Commenterpinswede

Thanks for that amazingly in-depth video! Sorry if I sent you down the rabbit-hole (or is that pot hole?) with the suggestion. You covered more than I could ever imagine.

And I'm so glad for having lived on both sides of the pond to really 'get' both sides of your muppets' jokes. Brilliant!

October 19, 2017 | Unregistered CommenterDahFinstah

Oh, forgot to mention: the short clips you pulled from the Telefunken (CX) record player were out-of-phase.

October 19, 2017 | Unregistered CommenterDahFinstah

Hi Matt,
I must confess I am impressed by the amount of time and research you put into these videos. I worked in the Hi Fi Trade for many years and never came across this one. I never knew of it's existence.

Perhaps it was because I sold hi end equipment that I missed it and perhaps the reps didn't want to push their luck.

When you think of the technology of today you could probably introduce something similar today but I don't think the purists would accept it.
Thank you for your time and effort. I really enjoyed this one.
PS I suspect the motor in the belt drive turntable was of the frequently generator type and that was were the bad speed issue was.

Jeremy Travis.

October 20, 2017 | Unregistered CommenterJeremy

Hi, Mat. Once again you have made an interesting, informative and entertaining video on a technology that I have never heard of, and I used to think I was well up on these things! I immediately checked all the many CBS albums in my collection - not a single CX amongst them!
Quadrophonic next? - another abortive technology that Sony and Columbia (and others) tried in the 1970’s.....

October 20, 2017 | Unregistered CommenterRoland

Thanks for all the comments and info - I've added the link to the DIY kit into the post as well.

October 20, 2017 | Registered CommenterTechmoan

I searched your site for Quadrophonics with just this comment being found. Is there any Quadrophonic equipment about I wonder? In the 70's I visited Decca's studios in London and saw them testing Quadrophonic remixes (someone and his two pianos I think?). Sometime later I also managed to get a copy of Simon & Garf's Bridge Over Troubled Water in a quadrophonic format (I still have it somewhere!) never managed to play it on any Quadrophonic kit, but it was compatible with stereo cartridge & turntable and was very high audio quality. I'd be interested to know if you've ever seen any equipment around?

October 21, 2017 | Unregistered CommenterSteve Wootton

Want albums to sound better, do what i did back in the early 80's, get a dbx compressor/dynamic range expander.. Heck of a difference and you get to play engineer

October 22, 2017 | Unregistered Commentertj treinen

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