Identifying Which Side Of A Switching Transistor Is The Collector

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On a bi-polar junction transistor BJT , those pins are labeled collector C , base . Alternatively, we can use a PNP transistor to create a high-side switch: . but if you can begin to identify common transistor circuits you 're on the right track!.

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    The construction and terminal voltages for an NPN transistor are shown above. The PNP Transistor has very similar characteristics to their NPN bipolar cousins, except that the polarities or biasing of the current and voltage directions are reversed for any one of the possible three configurations looked at in the first tutorial, Common Base, Common Emitter and Common Collector..

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    Back to SMPS Repair FAQ Table of Contents. Switchmode Power Supply Troubleshooting SAFETY The primary danger to you is from the input side of the supply which is directly connected to the AC line and will have large electrolytic capacitors with 320 V or greater DC when powered often, even if the supply does not work correctly and for some time after being unplugged especially if the power .

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    Back to Troubleshooting Table of Contents. Tools, Test Equipment, and Other Stuff Hand Tools Invest in good tools. If you are into garage sales, you can often pick up excellent well maintained tools very inexpensively but be selective - there is a lot of junk out there..

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