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App note: Extend range of current-sense amplifiers
Written by Administrator   
Friday, 06 May 2011 00:00

A current-sensor would be useful in a lab power supply. This app note is about chaining two current-sense chips to use at high voltages: 

Using a transistor as shown, you can double the allowed voltage limit on a current-sense amplifier by stacking two such amplifiers one upon the other. The voltage signal from the bottom amplifier then represents current as the voltage across the sense resistor, times the product of the gains of the two amplifiers.

App note: Extend range of current-sense amplifiers – [via]


Last Updated on Friday, 06 May 2011 01:06
Driver for Nokia 6100 LCD
Written by admin   
Tuesday, 03 May 2011 00:00

Authors: admin

This project provides drivers for the Nokia 6100 LCD. The driver has only been tested with the new Epson unit from SparkFun (Chinese clone, red tab on protective cover, green PCB with brown traces). It should work with the Philips or the older Epson chips too but will inevitably need some fixes. The driver has been tested on the ATmega168 and the dsPIC33FJ128GP but has been designed to be easy to port to other architectures.

Driver for Nokia 6100 LCD - [Link]

Last Updated on Monday, 02 May 2011 23:58
PIC 12F675 mini protoboard
Written by Administrator   
Tuesday, 26 April 2011 00:00

b0j3 writes:

Since I have a lot of ideas about different usages of microcontrollers it always happens I have to build basic microcontroller setup (microcontroller with oscilator).  Finaly I decided to make a small (or should I say mini) protoboard for PIC 12f675 (which I wanted to use for a small project). You can see the result on the picture.

PIC 12F675 mini protoboard –[Link]

Last Updated on Tuesday, 26 April 2011 00:26
OpenServo project
Written by the machinegeek   
Monday, 25 April 2011 00:00

Authors: the machinegeek

The OpenServo Project is an open community project with the goal of creating a low-cost servo for robotics. Check out their step by step instructions, which include using the familiar Atmega168 in the servo controller board.

Via :OpenServo Project

Last Updated on Sunday, 24 April 2011 23:58
Pulse Width Modulation (PWM) tutorial
Written by admin   
Friday, 22 April 2011 00:00

Authors: admin


PWM circuits are fun. You can use them to dim LEDs, control the speed of fans and motors, control the power going to a thermoelectric cooler, or control the power going to pretty much anything you want. Just make sure that you don’t exceed the maximum voltage rating of your device. The video explains it all.

Pulse Width Modulation (PWM) tutorial –[Link]

Last Updated on Friday, 22 April 2011 00:46
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