About: Ibrar Ayyub

Despite the long-predicted demise of the 4- to 20-mA current loop, this analog interface is still the most common method of connecting current-loop sources to a sensing circuit. This interface requires the conversion of a voltage signal—typically, 1 to 5V—to a 4- to 20-mA output. Stringent accuracy requirements dictate the use of either expensive precision […]

I bought most of the parts to built a self balancing bot many months ago. This time I didn’t use cheap Chinese stuff. I actually bought Pololu parts from a local shop. Pololu has a nice range of motors and motor controllers. I wanted to keep the bot small so I used the micro metal […]

This project is an Automatic School bell system. Such a system triggers a bell (or operates any other load) at predifined time. In this version some advanced features are introduced: – 16×2 LCD Display ( Displays current date, time and day) – 4×4 Keypad for Inputs – Stand alone product ( no PC required to […]

Here is a very simple, inexpensive and interesting project which provides lot of fun to a home experimenter or hobbyist. This simple transmitter can transmit speech over a short range. It can be used as a simple cordless microphone. The circuit uses two integrated circuits from Maxim. IC1 a MAX4467, is an amplifier raising the […]

In 2011 Prof. Harald Haas (pictured) of the University of Edinburgh demonstrated streaming a hi-def video signal using a light beam as a transmission medium. He went on to explain how this technology might be used to address the growing paucity of free RF bandwidth and suggested that domestic LED lamps may in future provide […]

Key Features Video Decoder NTSC (M, 4.43) and PAL (B, D, G, H, I, M, N, N combination), PAL (60), SECAM support with automatic format detection Software selectable analog input control allows for combinations of single ended CVBS, differential CVBS, and S-Video Built-in analog anti-alias filter Two 10-bit ADCs and analog clamping circuit Fully programmable […]

Introduction  This little project will demonstrate how you can build NEC protocol based Infrared Remote Control to use with various NEC Protocol IR receivers. actually there are lots of projects out there to accomplish this task but i have to write my own code because of too many requests on this IR(infrared) Remote Control Relay Board with PIC 12F675 […]

Introduction This circuit is a data logger that records voltage samples at specific time intervals. I’ve used it to record the voltage discharge curve on NiCad battery packs. The data file can be dropped into a spreadsheet and plotted. I’ve also used it to record the amount of time a possibly defective refrigeration unit was […]

I had designed a remote unit for my ST4000+ autopilot. It did prove out the concept and I used it a lot, but it sported an unsightly coil cord (and of course unsightly coil cords have no place on boats) so I decided to build a wireless remote. The system (handheld Tx unit and stationary […]

An Analog & Digital propeller clock i made! It isnt Real its just because your so awfully slow!!! 😉 based on an afterimage phenomenon, ie the reaction slowness of the retina, the illusion of reality our brains are “lying” Picture’s made 12-12-1997 by Luberth Dijkman Clock was actually running 2 weeks earlyer Bob Blick started […]