How to identify diodes from diodes, transistors from other transistors, IC's and LED's
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Posted by Albert on October 24, 2007, 5:56 am
Please log in for more thread options I'm pretty new to electronics. At school I'm making transistor switch, crystal radios, and crystal radios with amplification. Now in the room is the resister colour code which I can read pretty well, and I know where to put the right transistors by reading the colour 'bands'. I can also read '3-digit and a letter' capacitor codes. However, I can't seem to distinguish LED's, Integrated Circuits, Transistors or diodes! On a diode it reads 1N4148, on a transistor it states BC548 but what does this all mean? I don't imagine IC's have some 'value' or 'coding' since it's a circuit itself. And once I've worked out how to 'read diodes' hopefully I'll be able to read light- emitting ones too! Thanks for any help, albert | |||||||||||||
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Posted by Ross Herbert on October 24, 2007, 7:28 am
Please log in for more thread options >crystal radios, and crystal radios with amplification. Now in the
room
>is the resister colour code which I can read pretty well, and I know
>where to put the right transistors by reading the colour 'bands'. I >can also read '3-digit and a letter' capacitor codes. > >However, I can't seem to distinguish LED's, Integrated Circuits, >Transistors or diodes! On a diode it reads 1N4148, on a transistor it >states BC548 but what does this all mean? I don't imagine IC's have >some 'value' or 'coding' since it's a circuit itself. And once I've >worked out how to 'read diodes' hopefully I'll be able to read light- >emitting ones too! > >Thanks for any help, > >albert Think of all these component designators as the "names" of the boys and girls in your class. Each one of them will have certain characteristics which are slightly different to one another and as you slowly become familiar with the characteristics of these students you will begin to associate their names with those characteristics. In a similar manner you can become familiar with the names of electronic components and immediately associate those names with their characteristics. For the newcomer there is absolutely no better way to find out about electronic components than to read books, magazines and anything which describes basic electronics. Only by familiarity with the components and studying how they work will you gather the necessary insight which will enable you to instinctively recognise a component and what it does by its "name". There are many web based tutorial sites which can give valuable assistance. One of these is http://my.integritynet.com.au/purdic/ Read particularly the link describing recommended books. | |||||||||||||
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Posted by Eeyore on October 24, 2007, 8:51 am
Please log in for more thread options
Albert wrote: > Hi,
> > I'm pretty new to electronics. At school I'm making transistor switch, > crystal radios, and crystal radios with amplification. Now in the room > is the resister colour code which I can read pretty well, and I know > where to put the right transistors by reading the colour 'bands'. Transistors don't have colour bands. What exactly ARE you doing ? Graham | |||||||||||||
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Posted by Albert on October 25, 2007, 4:35 am
Please log in for more thread options wrote:
> Albert wrote:
> > Hi,
>
> > I'm pretty new to electronics. At school I'm making transistor switch,
> > crystal radios, and crystal radios with amplification. Now in the room > > is the resister colour code which I can read pretty well, and I know > > where to put the right transistors by reading the colour 'bands'. >
> Transistors don't have colour bands. > > What exactly ARE you doing ? > > Graham Well, I've got an assignment where I've been given the following components to research: resistor, capacitor, diode, led, transistor and IC. I have to research its value (or the measuring unit such as farads or ohms).Then How It's Identified (the bit i'm asking about): for a resistor, it's easy to write that on a 4-band resistor, the first two make a 2-digit number, the third is the 'multiplier' (or how many zeroes to add) and the last, its tolerance. And similarly for a capacitor (with slight differences, the ones i'm using have numbers writting on a dark pink circle). The function is pretty easy for everything, just required a google search and similarly for a circuit symbol. So that's exactly WHAT I'm doing: my problem is the How It's Identified section for the transistor, diodes, and Integrated circuits. Thanks | |||||||||||||
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Posted by Peter Bennett on October 24, 2007, 1:13 pm
Please log in for more thread options On Wed, 24 Oct 2007 02:56:49 -0700, Albert
>Hi,
> >I'm pretty new to electronics. At school I'm making transistor switch, >crystal radios, and crystal radios with amplification. Now in the room >is the resister colour code which I can read pretty well, and I know >where to put the right transistors by reading the colour 'bands'. I >can also read '3-digit and a letter' capacitor codes. > >However, I can't seem to distinguish LED's, Integrated Circuits, >Transistors or diodes! On a diode it reads 1N4148, on a transistor it >states BC548 but what does this all mean? I don't imagine IC's have >some 'value' or 'coding' since it's a circuit itself. And once I've >worked out how to 'read diodes' hopefully I'll be able to read light- >emitting ones too! > >Thanks for any help, > >albert Unlike the resistor and capacitor colour or number codes which do give the value of the part, the type numbers on diodes and transistors (particularly the North American "1Nxxx" and "2Nxxx" types) don't usually "mean" anything. That is, you can't generally look at a part number and determine anything about the device - you have to find a data sheet for that part to find its specifications. (I happen to know that a 1N4148 is a small signal diode and a 1N4007 is a 1 amp rectifier - but that's only because I've used both types.) (The European part number system used for the BC548 transistor you mentioned does provide some general information on the type of the device in the letters, but the numeric part is just a sequential number, so you still have to find a data sheet to get the detailed spec.) -- Peter Bennett, VE7CEI peterbb4 (at) interchange.ubc.ca new newsgroup users info : http://vancouver-webpages.com/nnq GPS and NMEA info: http://vancouver-webpages.com/peter Vancouver Power Squadron: http://vancouver.powersquadron.ca | |||||||||||||
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>
>I'm pretty new to electronics. At school I'm making transistor