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Chip Amps Amplifiers based on integrated circuits

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Old 25th September 2012, 02:36 AM   #11
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i don't have any packages i scrounged these off of old TV circuit boards and other random circuit board pieces.
I have a couple of them and i'm not sure if they even work or not..
here's the numbers and letters than i can read
different transistors seperated by ()'s

(2SD2599N 0770) biggest one I have and im not sure if that is a D or a 0

(C4458 M 2K4) the M is below the C and the 2K4 is under the 8

(GF 7809A) this one is a little smaller than the second one.

(D2102 301) this one has more readable letters and numbers on it

there was one that i used one time I got it to work as a switch amplifier though it sounded like turd it actually amplified my computers headphone output to way louder volumes but i cant use or find that one anymore
first because one of the leads on it broke off making it useless and now i just cant find it anymore. so i cant find the numbers for that one.
and all of these transistors are way way way bigger than the little tiny ones shown in that tutorial at least 5 or 6 times bigger and one is pretty big

also.. i have no breadboard.. i only use wires to wrap around the leads of the transistor or to other wires.

Last edited by realflow100; 25th September 2012 at 02:40 AM.
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Old 25th September 2012, 02:54 AM   #12
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Don't bother trying to help this guy, look at his other thread...

exactly HOW does a tube amp work? or a vacuum tube?

He's just laughing up his sleeve at you.
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Old 25th September 2012, 02:56 AM   #13
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There is a semiconductor numbering scheme in which the transistor name begins with "2N". This signifies that the device has 2 PN junctions. You'll see diodes numbered with "1N" for the same reason. There's another numbering scheme where letters like "SC" and "SD" are used to better describe the transistor. And sometimes the "2S" is omitted because that just tells you it is bipolar silicon.
So your transistors are 2SD2599N, 2SC4458, and 2SD2102. You'll notice that the 3rd on your list doesn't have that kind of numbering. That part isn't a transistor; it is a 9 volt positive voltage regulator, a 7809.
Enter those numbers into a web search engine and you'll find datasheets. None of them are FETs.
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Old 25th September 2012, 03:12 AM   #14
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i see and i noticed there is no metal backing on the other two.
so i'm guesing it's npn transistors that i'm working with?
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Old 25th September 2012, 03:26 AM   #15
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Stop guessing and look at the datasheets.
Folks here, including myself, will be more inclined to assist if they see you making an effort to learn. "Silver platter" requests are generally (and rightfully, IMO) ignored, or derided.
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Old 25th September 2012, 03:57 AM   #16
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i did read the data sheets and it's exactly the help i needed thanks

Last edited by realflow100; 25th September 2012 at 04:03 AM.
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Old 25th September 2012, 04:07 AM   #17
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The best thing to do is at least learn somthing .. There is a million and one small amplifier projects on the net. At first learn ohms law and then move on to identifiying diffrent conponents . The resistor color code would be a good place to start.. Anyway good luck with your new found hobby It looks like it will be a long trip..

Regards
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Old 25th September 2012, 04:25 AM   #18
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Quote:
i did read the data sheets and it's exactly the help i needed thanks
Happy to hear it.
You'll notice that 2 of the 3 transistors you hold have integrated resistors across the bases and emitters. The resistors are formed right along with the transistors. Keep that in mind when experimenting. And one of those two is a Darlington type, two transistors connected together for extra high gain.
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Old 25th September 2012, 06:58 AM   #19
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thanks it works great although I can't seem to make it sound clean it sure amplifies the bass a lot! my 12 inch subwoofer is flexing from this thing with only two double A batteries!!
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Old 25th September 2012, 10:41 PM   #20
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The subwoofer is probably flexing so much because without an output capacitor (to block the DC) the DC is causeing your subwoofer to extrude ....
Audio signals are AC and you run transistors (and most curcuitry) off of DC so usually there is a capacitor to block the DC from getting to your speaker , the DC will slowly but surely ruin your speaker ......
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