Ebay haul: lithium battery paraphernalia
In order to further my understanding of lithium battery technology, I've been on an eBay buying spree. It's all cheap…
12v meteor shower led strips
Fitted with 22 LEDs, a 14-pin microcontroller and a 5v regulator, these LED strips are described as having a meteor…
Fun with ice sculptures, a cpu heatsink and a peltier element
What started as a test on an 8A digital buck converter, quickly changed direction and became messing about with a…
Project preview: wearable oled data display wristwatch device
This is a wearable wristwatch data display combining an OLED display, 3v 8MHz Arduino Pro Mini, 240mAh LiPo battery and…
Charging a lithium 18650 cell using the tp4056
Using a very cheap single cell lithium battery charger module based on the TP4056. For less than £1 you can…
Lithium battery fun – testing 18650 cell undervolt protection circuit
For the very first time I step into the exciting world of lithium batteries - and I get my fingers…
Review: 2-wire led voltmeter takes 5v to 120v dc supply voltage
Just received this really neat LED voltmeter. It's 2-wire, so it measures it's own supply voltage, but that can be…
Using auto-reset refillable inkjet printer cartridges #1
I had to buy a new printer because my old Canon blew up - the power supply board failed (it…
Fake lm2596hv voltage regulator buck converter modules bought on ebay
There's a really useful variant of the LM2596 voltage regulator called the LM2596HV which can handle 60 volts on its…
Practical mosfet tutorial #6 – dcoi opto-isolator driver
Using the Dual Complementary Opto-Isolator (DCOI) MOSFET driver to interface a microcontroller with high-side and low-side, N channel and P…