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Old 11th May 2013, 03:22 PM   #1
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Default cannot find circuit diagram for transistor

it is a transistor with these numbers and letters written on it

S
185 7-42
T317

not very helpful search results on google any combo of searching these numbers?
can someone guide me on how to find the circuit diagram for this transistor?
And just to let you know I have 4 of these all the same numbers and letters on them.
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Old 11th May 2013, 03:37 PM   #2
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You mean "datasheet"?
Where did they come from?
Could you place some pictures?
Thank you!
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Old 11th May 2013, 03:52 PM   #3
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"T317"
looks like regulator, ain't it?
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Old 11th May 2013, 03:53 PM   #4
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datasheet would be very helpful! that's just what I need but I cannot find one that matches... all of the ones that I find are just voltage regulators and i know for sure what I have are transistors. (I managed to get one to work as an audio amplifier except the fact I have no clue which lead is truly the base collector or emitter. and there was DC flowing to the output but it was many times louder than just what the headphone output on my computer normally could put out. I cannot take a picture at the moment because I dont have a camera
they appear to be high current transistors (they came out of an old turntable circuitboard and conveniently had wires already coming off of the leads.
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Old 11th May 2013, 04:45 PM   #5
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I'm willing to bet it is an adjustable voltage regulator IC. These can even be configured to function as an amplifier, I believe board member Elvee has some examples posted. Look at this data sheet:

http://www.datasheetcatalog.org/data...0/52713_DS.pdf
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Old 11th May 2013, 04:49 PM   #6
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well I guess even though I have 4 of them I cannot make a push-pull transistor amplifier.. they're probably all the same type.. way to waste my own time..

Last edited by realflow100; 11th May 2013 at 04:52 PM.
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Old 11th May 2013, 04:55 PM   #7
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The data sheet I directed you to shows the TO-3 style can, the TO-220 and the TO-18 case styles. From what you describe it will be one of the TO-3 types. Please look closely at the data sheet.
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Old 11th May 2013, 05:15 PM   #8
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it appears to be the 1st one in the list second to last page.
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