(Read 386 times)
Mar 17, 2013, 05:23 am
ok i know about npn pnp transistors but i want to salvage used ones from electronics to save a few bucks but they all seem to have different model numbers on them do they all still function the same?
Mar 17, 2013, 05:47 am
Look up the numbers and see what they tell you.
Location: Johannesburg. UTC+2
Mar 17, 2013, 05:52 am
Well all npn work the same in the sense that active they can switch a collector-side load on, and pnp's active can switch an emitter-side load off. (I think I got that the right way round
But they all differ in terms of gain and the voltage and current they can handle. A site like
is useful to get sight of the various datasheets.
might help, as might
Roy from ITCrowd: Have you tried turning it off an on again?
I'm on LinkedIn:
Mar 18, 2013, 01:50 am
Also they vary in their high-frequency performance and noise performance. However for simple uses you really just
need to check the voltage, current, power and gain ratings are adequate. Also for use as a switch the Vce(sat) rating
tells you how much voltage and power will be lost in it when switched on and carrying a certain current.
[ I won't respond to messages, use the forum please ]
Location: New York, NY
"Why should I bother with made-up games when there are so many real ones going on." (c) Kurt Vonnegut
Mar 18, 2013, 06:12 pm
They all work the same but just vary in quality and current handling.
Arduino Uno R3
Mac OSX Lion
Where is your SSCCE?!?!
Mar 18, 2013, 06:15 pm
Be warned that what looks like a transistor may not be a transistor. Besides NPN and PNP Bipolar Junction Transistors you also have FETs of various kinds, diodes, sensors, etc all in the same or similar housings.
Get 10% off all 4D Systems TFT screens this month: use discount code MAJENKO10
Location: Manchester (England England)
Solder is electric glue
Mar 18, 2013, 07:10 pm
A lot of multimeters have a transistor testing socket on them. That will tell you what you have.
This project will tell you what you have and what pin out it is:-