Author Archives: Ajith

Simple Voltmeter schematic using Maxim’s ADC with LED driver

Posted on Monday, 9th May 2011 by Ajith

MAX1496 is an ADC with internal 31/2 digit LED display driver. This is an ideal IC for simple voltmeters. You just need the IC, and a couple more components and you are done. The following is a circuit I made … Continue reading →

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USB Microcontroller Programmers and Laptop RAM

Posted on Saturday, 23rd April 2011 by Ajith

After wasting a lot of time, I finally made the OpenProg. The whole deal was much easier because I had already built the USBPICprog. OpenProg is not just another programmer, it will program Microchuip’s PIC micro-controllers, Atmel’s controller and read … Continue reading →

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PWM chip CG8010DX16 SMPS schematic and datasheet

Posted on Friday, 4th February 2011 by Ajith

Murugesh, a reader had asked mt to identify an IC. Guys at edaboard have identified as a PC SMPS PWM controller – CG8010DX16 Continue reading →

Posted in IC | Tagged , , | 4 Comments

Op-Amp based voltage regulator tutorial and SPICE modelling

Posted on Friday, 14th January 2011 by Ajith

The tutorial is taking a long time. In the mean time here are the screen captures, schematic and the LTSPICE files. Downloads Op-Amp_linear_voltage_regulator SPICE files

Posted in Linear | 2 Comments

New multimeter – Extech EX430

Posted on Tuesday, 4th January 2011 by Ajith

My multimeter of 8 years a Mastech M92A had lost its accuracy. I was in dire need of a new multimeter. Here in India, all the Flukes and Extechs cost double of what its worth in the US or Europe. … Continue reading →

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Design : Linear Voltage regulator using Op-Amp Voltage follower

Posted on Monday, 15th November 2010 by Ajith

The was down for a couple weeks because my dealer couldn’t get me a replacement for the broken power supply. Although I had a friends laptop, the unreasonable delay got me quiet frustrated. In fact it pushed me so hard, … Continue reading →

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Breaking in – Compaq C770TU laptop

Posted on Sunday, 31st October 2010 by Ajith

My laptop is a Compaq C770TU which has been out of service for some time because of a faulty power supply. I tried to build a power supply temporarily due to delay in acquiring a new one. The plan was … Continue reading →

Posted in General | 1 Comment

PC SMPS schematics with IC 2003 and TL494

Posted on Friday, 29th October 2010 by Ajith

Switch mode power supplies (SMPS) schematic using TI’s TL494/LM339, Fairchild’s KA7500 and IC2003. Most of the datasheets and some pictures are also uploaded here. Continue reading →

Posted in Switching | Tagged , , | 39 Comments