What’s inside a finger spinner? electronic version
Teardown of a fidget spinner. I wanted to make a video while on holiday, so I chose to take apart…
20,000mah failed powerbank teardown
My PowerAdd Pilot X7 powerbank failed - the torch LED is permanently on, the switch is unresponsive and there's was…
Julian’s postbag: #100 – a prediction for the future
A look at the YouTube silver play button which I received recently "for surpassing 100,000 subscribers". A look at two…
Update: supercapacitor powered bluetooth speaker
My 10k resistor mod to override the amplifier mute, is causing problems with speaker thump. Also, checking a different method…
Project idea: 8-cell balancer discharger using 9 arduinos
Disappointment with the extremely slow balance charging of the Turnigy 8150 got me thinking about a new project.
Review: 7.5w solar rucksack backpack from banggood
This nice looking green/brown denim rucksack has a solar panel which delivers more power than its 5W specification would suggest…
Muppet 2 – a bidirectional buck/boost dc/dc converter
New idea for the evolution of my MuPPeT (Maximum Power Point Tracking) solar charge controller.
Supercapacitor bluetooth speaker testing
Testing the amplifier module and 8 ohm speaker. Applying a modification to enable the Aux socket. Testing the module on…
Measuring the capacitance of a supercapacitor
Using the formulae for Coulombs to measure the capacitance of a SuperCapacitor. https://en.wikipedia.org/wiki/Coulomb
Making led bargraph single inline sil displays
Bespoke-made single inline LED bar arrays for the 8-bit breadboard computer