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im need book help me how i can test transistors in pc boards .

So, you want to test transistors while they are in the circuit.-- tell us when power in on or power supply removed? if in circuit testing is required you can test by junction voltages -if powered-- or in dide range of DMM if power is removed.-- you sshould have a comperhensive idea of adjecent circuitry for this type of testing as junction some other transistoir can be parallel to the one under test --perhpas a diode is alrady across collector emiter if you test without imagining situations like that-- you will be likey misguided as to the condtion of the device under test (DUT)

perhaps electronic principles by AP Malvino may be a better book -- try it

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