Martin-Jones Technology Ltd, technical problem-solver, electronics, software, hacking, making it work, from gigabit serial to EV charging.
Warsaw, PL and Cambridge, UK
Joined June 2015
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RIP William Orbit. A musical and production legend. youtu.be/PneAIfv30jA?is=hXxM…
Happy coincidence of the day: though UK electrical accessories use a large square mounting box and continental European ones a small round one, the screw spacing (2 3/8" vs 60mm) is close enough that some things fit. So I can use a BS546 5A socket to connect lights in Poland.
New electronics lab has, annoyingly, no earth connection on the mains sockets. This is quite typical in Polish houses older than about 20 years. 🧵/1
Plug in the Robin loop impedance tester. Mains voltage looks fine and the right combination of lights are on, which is promising. Let's see what the reading is. /3
In the car in Warsaw, Poland just now I was surprised to hear @TheRadCaroline coming through loud and clear on 648kHz AM. After a few minutes the signal faded out, to be replaced by @MurskiVal all the way from Slovenia.
"Daddy, why has the battery gone all puffy?" This is the USB charger supplied with a toy drone. Just a 3.9 ohm resistor in series with the (lithium) battery. No wonder it overcharged. Charger, and battery, now retired.
Chris Jones retweeted
#OTD 27th Sept 1825, LOCOMOTION № 1 ran along the Stockton & Darlington Railway. Now, Britain’s rail & heritage sectors have united to get this incredible replica train to do the same. So, hop aboard at 10x speed for your own ride… back in time!
(PS. thx @kylieminogue 🥰)
Enjoying doing analogue measurements to verify the results of digital calculations. Where's the fun in an FFT when you can twiddle knobs instead?
Chris Jones retweeted
The most INSANE Bohemian Rhapsody flashmob you will ever see!!
With 30 musicians and singers in the streets of Paris 😍
Lead singer: @mickeycallisto
Lead guitar: Olly Pearson
Pop choir: DDKN sisters, @sone_sings and @colinesicre
Counter-tenor solo: @michaelkonesaki
This is a surprisingly accurate insight into Polish society...
I can remember when we'd take a bucket and spade or a ball on a trip to the park with the children. Now we have to take this.
My children have these toy PMR446 walkie-talkies. We have three of them. Recently the blue and green one wouldn't communicate with the other two. Time for Dad to investigate. 🧵/1
The radio chip is a BK4819 and a data sheet is available. It says the master 26MHz crystal should be accurate to 2.5ppm, which is pretty ambitious for a toy. The example circuit diagram shows a trimmer on one leg of the crystal but that's not present in this radio. /4
We have a couple of these toy digital cameras. They take terrible photos and videos and print out on thermal paper, and the children love them (also because they play Snake). This one broke today. Time for daddy to fix it. 🧵/1
Add a bit of Kapton tape to try and prevent a recurrence of the fault. It's pretty certain to get dropped again! /7
