tutorial:DIODES
This tutorial is taken from the book MY EXPERIENCE IN AUTONOMOUS ROBOTICS. you can download it free from the files section(FILE-ROBO.PDF) of yahoo group-booksbybibin http://groups.yahoo.com/group/booksbybibin/ comments about this book on www.booksbybibin.blogspot.com DIODES Diodes are two terminal devices which conduct electricity in one direction. Current flows from anode to cathode when the diode is forward biased. In a normal forward biased diode, energy is dissipated as heat in the junction, but in LED's energy dissipated as visible light. In robotics we use normal diodes as free wheeling diodes or to make power supply. LED's are of two types - IR led and normal LED. IR LED emits Infra Red radiations while normal LED emit visible light. So first talk about a normal diode. Mostly we us 1N4001 or 1N4007 as free wheeling diodes for motors or relays, sometimes in H-bridge also.
From the above figure try to find out which diodes are forward biased and
which are reversed biased. You can see that a) is represents symbol of a
diode b), d) are forward biased and c) is reverse biased(voltage at the P
junction should be greater than N junction by .7V).
Figure shows normal diodes with different power ratings. I don't know
about the transistor type diodes. High power rating diodes are used for
high power motors. The following figure shows the normal diode available
in the market.
Above figure shows how to bend the leads of a diode and a resistor so that
a properly inserted into breadboard or PCB. But remember not to bend too
close to body.But there are different diodes-LED,IRLED,Photo Diode,Zener
Diode. But in robotics we use LED,IR LED's , Photo Diodes. Diode and
Zener diodes are used, but rarely.
Can u tell the voltage,v . Vcc ranges from 0-50(it can go up to 200v also, for
high power ). v range from .65 to .8 depending on series resistance(.7V)
This tutorial is taken from the book MY EXPERIENCE IN AUTONOMOUS ROBOTICS. you can download it free from the files section(FILE-ROBO.PDF) of yahoo group-booksbybibin http://groups.yahoo.com/group/booksbybibin/ comments about this book on www.booksbybibin.blogspot.com DIODES Diodes are two terminal devices which conduct electricity in one direction. Current flows from anode to cathode when the diode is forward biased. In a normal forward biased diode, energy is dissipated as heat in the junction, but in LED's energy dissipated as visible light. In robotics we use normal diodes as free wheeling diodes or to make power supply. LED's are of two types - IR led and normal LED. IR LED emits Infra Red radiations while normal LED emit visible light. So first talk about a normal diode. Mostly we us 1N4001 or 1N4007 as free wheeling diodes for motors or relays, sometimes in H-bridge also.
From the above figure try to find out which diodes are forward biased and
which are reversed biased. You can see that a) is represents symbol of a
diode b), d) are forward biased and c) is reverse biased(voltage at the P
junction should be greater than N junction by .7V).
Figure shows normal diodes with different power ratings. I don't know
about the transistor type diodes. High power rating diodes are used for
high power motors. The following figure shows the normal diode available
in the market.
Above figure shows how to bend the leads of a diode and a resistor so that
a properly inserted into breadboard or PCB. But remember not to bend too
close to body.But there are different diodes-LED,IRLED,Photo Diode,Zener
Diode. But in robotics we use LED,IR LED's , Photo Diodes. Diode and
Zener diodes are used, but rarely.
Can u tell the voltage,v . Vcc ranges from 0-50(it can go up to 200v also, for
high power ). v range from .65 to .8 depending on series resistance(.7V)