Thursday, July 30, 2009


All of us must have studied 'DC coupling and Ac coupling', but most of us neglect the use of a coupling capacitor while designing our circuits. Be it in our old faithful 7805 circuit to power up our applications or on the VCCs of our ICs. And often we face the same problem of project not working specially in front of our Boss or Project Guides. Many a times it would happen that you are upto running a RS232 link between your board and PC, and sometimes it would run and sometimes wont. Interfacing a LCD is a pain if you are a novice. It will eat your head because of its timing conditions and initiallization problems. But many of us would have faced a certain problem many times. You switch on the supply and the LCD shows a lot of garbage data. And after a few struggles of turning on the power slowly you get ur data up and running. Or if you have just interfaced a some good motor on your project and your other peripherals stop working.

All of this could be avoided if we take care of inserting a few capacitors in our projects. It will drain out all the stupid noise and glitches you never ever wanted. But yes please do not forget to check the polarity of an electroltytic capacitor. Or else believe me, you'll have to taste some good electronic cigar!

Well I would like to have your comments on this very first article of mine. This post is also open for further discussions.

1 comment:

  1. good suggestion many times we neglect something considering not important but if we see conceptually noise is created everywhere let it be amplifier diode or even resistor too so if we have to minimize the noise effect we have to filter it by appropriate value of capacitor and resistor(if needed), obviously it depends on the circuit philosophy and psychology.
    well going mote