Few months ago I ordered ARTESYN – NLP40-7629J – SWITCH MODE POWER SUPPLY from element14. Including shipping and taxes, it took nearly Rs. 3500 (~USD $70) to reach me. Have a look at the SMPS in the pictures below.
Author Archives: Arup
H Bridge inverter power stage with passives
The above circuit I got from replies from edaboard. I had created a thread there on how can I drive a 2 pin primary transformer with H bridge configuration with my SG3524 PWM circuit. I got many replies to use dedicated driver ICs, suggestions to use floating high side gate driver, etc. But I […]
OSSDAS v1
The PCBs for OSSDAS came yesterday by post from SeeedStudio. This is the completed board. Looks like old firmware was still in the microcontroller. The board just booted up after soldering with old software. Now it’s time to work on the software. I’ll upload all project files to github once I learn how to use […]
LM317 regulator board PCB making
LM317 is the most used and easily available adjustable voltage regulator. Here I’ve designed a simple PCB for the regulator with surrounding diodes, capacitors, resistors, etc. In this board, the voltage adjustor connector is given into which a potentiometer can be attached for variable supply.I’ve designed the board from the given application circuit in the […]
How to repair mobile charger circuits
The above image shows the inside of a typical mobile charger. These chargers can burn anytime and then they need to be replaced or repaired. This tutorial is about how to repair mobile charger circuit. Fortunately the mobile charger repair process isn’t much hard. As there are few components to be checked and needs to be […]
Step by Step: Make an Inverter’s power stage (MOSFET)
Here I show how to make the Power stage of an homemade inverter. I’m using the following, Old UPS transformer 2x Alluminium Heatsink 2x N-MOSFET (IRF540N, P55NF06, B150NF55 etc) Screws, spade terminals, wires, etc First we need to place the MOSFETs in the heatsinks in appropriate place so that the heat tab i.e, metal part […]
Convert square wave Inverters to sine wave Inverter
There’s pretty easy to make square wave inverter circuit in the internet. But to run most load like fan, TV, etc you need to have a sine wave inverter. Making sinewave or near-sinewave inverter is more complex and costly. But we can also convert square wave inverters to sinewave inverters. A LRC resonant circuit is […]
DIY LED driver for 5Watt LEDs, 12V strips from 100-240 VAC
I got many requests to provide guide to build simple 230V to 1,3,5 Watt LED driver in response to my simple led driver diagram. So, below I’m writing an article on making of a high power LED driver circuit. The below device is able to run upto 5Watt LEDs from the LED supply line and […]
OSSDAS rev. beta
This is current revision of the OSSDAS project. This new beta design is as follows. After few days this design will go to a board house. Now just touching it for perfection. Any features/suggestions are welcome. Features added: Current sense through even lower valued resistor and using op-amp to multiply the very low drop voltage. […]
Simplest Solderless Breadboard Power Supply
To make a nice breadboard power supply at the cheapest and simplest way, you need the following, An old unused (working) mobile charger. A 2×2 0.1″ pitch male pin header. A LED of any color, any shape. I used 0603 SMD LED. A 1K resistor. I used 0603 SMD resistor. First of all, cut the […]