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Old 29th July 2004, 09:55 PM   #1
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Location: Springfield, MA
Default How do you test transistors?

Everyone says to test the transistors on a broke amp because they are usually the culprit. I see that some people desoder them first and some people don't. Some people say you can use a multimeter and some say you need other tools. My amplifer is broken but nothing is physically damaged. Could someone point me in the right direction?
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Old 30th July 2004, 06:56 AM   #2
Netlist is offline Netlist  Belgium
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I keep recommending this nice fellow's site:

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Old 30th July 2004, 08:36 AM   #3
Vivek is offline Vivek  India
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If I was in your place, I would remove the transistors and test them like one tests a diode. Most DMMs have a diode test facility. Use that.

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Old 30th July 2004, 10:35 PM   #4
NB23 is offline NB23  United States
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If you don't have a transistor or diode tester, you could easily use an ohmmeter on your multimeter. You need to make sure that if it is a bipolar or FET tranistor. Bipolar tranistors could either be NPN or PNP. FET's could be JFET's, MOSFET's, etc... Most commonly amplifiers use NPN tranistors or modern amplifiers use MOSFET's N-channels I think. Oh yea, there are two types of MOSFET's N-channel, and P-channel. The gate to source and drain on an ohmeter should read about 35ohms(varies on each transitor). Drain to source should have continuity. It would be easier to check out bcae1, great website if your getting into electronics and/or car audio.
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Old 31st July 2004, 02:45 AM   #5
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Thank you everyone for all your help!
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