Circuits DIY – Page 4 of 12 – Electronics & Embedded System news, tips and tutotials

Failed Prototype: VAmeter v3

Last Updated on November 19, 2016 by Arup 11 Comments

Just a few days ago the PCBs for VAmeter v3 came in. VAmeter is a simple board that connects to your existing power supply and shows the volatge, current, etc. […]

Usb li-ion charger build

Last Updated on October 29, 2016 by Arup 37 Comments

This is the completed PCB of the USB li-ion charger circuit.

Low voltage cutoff circuit for Inverters

Last Updated on October 8, 2017 by Arup 14 Comments

Running inverters on battery drains the battery. This decreases the battery voltage. To regulate output voltage and to make it independent(upto a certain level) we use PWM based drivers like […]

USB li-ion charger revision

Last Updated on November 6, 2016 by Arup 34 Comments

An year ago, I’ve shared a circuit of USB li-ion charger based on LM358opamp. The circuit had some problems as reported by commentators that inclide wrong direction of LEDs. Features: […]

Bench PSU made by ARTESYN NLP40-7629J SMPS

Last Updated on October 29, 2016 by Arup 6 Comments

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 […]

H Bridge inverter power stage with passives

Last Updated on October 30, 2016 by Arup 10 Comments

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 […]

OSSDAS v1

Last Updated on October 30, 2016 by Arup 3 Comments

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 […]

LM317 regulator board PCB making

Last Updated on May 25, 2017 by Arup 10 Comments

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 […]

How to repair mobile charger circuits

Last Updated on January 8, 2018 by Arup 40 Comments

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 […]

Step by Step: Make an Inverter’s power stage (MOSFET)

Last Updated on October 30, 2016 by Arup 97 Comments

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, […]