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…
Led lenser m5 vs fenix tk41 vs $10 homebuilt 100w flashlight
A completely unfair comparison between the LED Lenser M5, the Fenix TK41 and my $10 homebuilt 100W LED flashlight.
Dual complementary opto-isolator dcoi mosfet driver #6 – holy grail
In preparation for my next MOSFET tutorial, I'm using the DCOI driver with an added bootstrap capacitor to drive the…
Dual complementary opto-isolator dcoi mosfet driver #5 – circuit diagram
I've finally got round to drawing the circuit diagram for the DCOI MOSFET driver, so here it is with an…
Testing a few cheap led ammeters bought on ebay
I just love these cheap LED voltmeters and ammeters you can get on eBay. Here I wire a bunch of…
Monster 7,500 lumens 100w led flashlight for under $10
Help support Julian's LED videos on Patreon: https://www.patreon.com/julian256 I discovered that due to a lucky co-incidence of voltage and internal…
How to use the xl6006 sepic led driver module #2
After a fair bit of experimentation, I've found that the 12v supply can be used as a shut-off signal for…