Rolando Fallorina
- Mar 8, 2017
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Help! our project is to make a amplifier, but we must know what is the function of ECG, IRF, and 2N transistor, Help me pls 
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Can we avoid going on a snipe hunt here? Haven't used snipe components for amplifiers in ages, although I do have a stash of SN74xxx devices that might qualify.
correct
IRF and 2N (along with BC, TIP, 2SA, and numerous others) are just the prefix part of the manufacturers part number.
On its own it gives you very little information (some tell you more than others. 2SA tells you more than 2N, but not much).
The next part of the part number tells you enough to look for a data sheet. For example 2N2222 and 2N3055 are the part numbers of some traditionally commonly used transistors.
Following this there may be more letters and numbers which can define all sorts of stuff. TIP31C, for example.
For some devices the full manufacturer's part number goes on for up to a dozen or more additional characters, defining subsets of parameter ranges, the package the transistor is in, and even how the individual devices are packaged for delivery and use (loose, on tape, in tubes, on trays, etc).
On its own it gives you very little information (some tell you more than others. 2SA tells you more than 2N, but not much).
The next part of the part number tells you enough to look for a data sheet. For example 2N2222 and 2N3055 are the part numbers of some traditionally commonly used transistors.
Following this there may be more letters and numbers which can define all sorts of stuff. TIP31C, for example.
For some devices the full manufacturer's part number goes on for up to a dozen or more additional characters, defining subsets of parameter ranges, the package the transistor is in, and even how the individual devices are packaged for delivery and use (loose, on tape, in tubes, on trays, etc).
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Taking a wild guess at it, I'd say "no." We probably won't escape a lengthy bout of Twenty Questions, either.
To the OP: you've asked for information we cannot possibly provide. First, transistors don't have functions other than what they're called on to do in a specific circuit. Without knowing the circuit you have in mind, we can't even guess what those transistors' functions might be.
Second, ECG, IRF, and 2N are just part number prefixes; they're only partial part numbers and do not denote specific devices; they don't even necessarily denote general classes of devices.
If you expect to get any meaningful help here, you need to post a circuit diagram with all pertinent information, including complete part numbers for all semiconductors and component values for all resistors, capacitors and other passives.
Rolando Fallorina
- Mar 8, 2017
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oh I'm sorry, i thought they denote a specific device, maybe that is the reason of having a hard time to find the data sheets on google. Thanks for these comments
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You really need to give some thought to what you ask Google to find. For example if your class assignment is to build an amplifier from semiconductor components, ask yourself what kind of amplifier ir should be, and what kind of signals it should amplify. What will the signal input amplitude be? What is the bandwidth of the signal? What input impedance do you need? What is the impedance of the signal source? How much output signal must the amplifier provide? What impedance should it be able to drive? Is distortion important, and if so, how much and what kind of distortion? Hi-fi buffs want (unrealistically) zero distortion at any output level. Guitar amps, OTOH, often require a certain kind of distortion to produce a characteristic sound. And that's just for audo amplification. You can go on up in frequency as high as you want and find an amplifier circuit that will work. But answer the questions first, then form a well-crafted Google search string. Try this one: "transistor for audio microphone amplifier" and see what Google finds for you. You will almost instantly get something on the order of half a million results. So scan down the links and narrow your search. How many transistor stages for this project? Adding or deleting words in your Google search string can have profound effects on the results that Google returns. Play around with this until you begin to get a feel for how Google searches. Remember, you are human and Google isn't. What Google is is damned fast. Once you find something you think might work, open that link and read it for some key words you can use in another Google search... some transistor part numbers for instance. Open links in new tabs so you can quickly go back and forth to review and compare what you find, deleting the tabs that lead down blind alleys. This is called research, and you should learn how to do it.
oh I'm sorry, i thought they denote a specific device, maybe that is the reason of having a hard time to find the data sheets on google. Thanks for these comments
no problems
so if you have specific devices search for the full device name eg,. 2N2222, 2N3904, IRF 511, BC546 etc
2Nxxxx are generally American made
BCxxx were British made
2SAxxxx, 2SBxxxx, are PNP transistors from Japan
2SCxxxx, 2SDxxxx, are NPN transistors from Japan
2SKxxxx, and 3SCxxxx are FETs also from Japan
Dave
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