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Yi 2 - Best Budget 4K 

Gitup Git2 (My Pick)

Xiaomi Yi


DR02 D - Best Budget Dual Cam

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%! 

« A True Tech Classic - The Sony TC-D5 Field Recorder | Main | RetroTech: The Atari Video Music »

On Wax/Off Wax - Building an Edison Wax Cylinder Recorder Kit

In this video I’m assembling an educational kit from Japan. The end result should be a functional model of an Edison Cylinder Phonograph.
Places to find Gakken Kits...
1) Amazon  UK  US
2) ebay  (click a country, ensure ‘International Search’ is turned on
UK  US   DE   CA   AU   NL 
Here is the Gakken Japan website 

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Reader Comments (6)

Fascinating item - shame it didn't work. Great video as always. What is the difference between the record and playback heads?

May 3, 2017 | Unregistered CommenterRoland

They're angled in opposite the record head works as a cutter and the play head is supposed to ride along in the existing trough.

May 3, 2017 | Registered CommenterTechmoan

Have you seen this before

May 4, 2017 | Unregistered CommenterRon Bolton

It's quite funny when companies try to produce these sorts of educational kits. I had a friend who had an original Edison machine and the cylinders were a much bigger diameter. This looks like they are trying to record on a candle. Thank you for a very entertaining video Mat. You will probably find company in the future selling rolls of sticky tape and some iron filings trying to replicate a tape recorder.

May 5, 2017 | Unregistered CommenterJeremy

Tim Hunkin did exactly that a few years ago - check this link. He records and plays back from sticky tape covered in rust powder - 10mins in, but the whole programme bears watching.

May 5, 2017 | Unregistered CommenterRoland

Hi Roland,
I remember that series. I think we used to record them and show them to school kids back in the day.
Had Edison succeeded we would be making cylindrical tubes with optical data recoded on them.
Personally I am waiting for the SD card slot in the back of the head and do away with all the hardware.

May 5, 2017 | Unregistered CommenterJeremy

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