pnp tansistor problem(2n3906)

[daredavel]

How can you determine if the transistor is broken? without the data sheet, how can you determine the right pin assignment of a pnp transistor? a simple experiment about the transistor to know which is the emitter, base, collector? Thank you!!

 

[KMoffett]

Do you know how the get data sheets? Google: 2N3906
https://www-inst.eecs.berkeley.edu/~ee105/sp10/labs/2N3906.pdf

You can use an Ohmmeter. You can tell if the junctions are good, but you will not be able to differentiate the collector from the emitter.

Ken

 

[daredavel]

thank you sir! do you know a simple circuit experiment to know if the transistor is ok or not? maybe to lit up a LED.. thank you sir!

 

[MikeMl]

Hook a load resistor (about 1K) from collector to negative supply set to ~10V.
Hook positive supply to emitter, call that ground.
Hook base to neg supply through a 47K current limiting resistor.
The collector should switch from ground to negative as the base resistor is connected/disconnected.

If it works, the β is at least 47K/1K.

 

[schmitt trigger]

If you are serious about electronics, you should invest in test equipment. Of course there is the multimeter and power supply, but one tester that has proved invaluable more than once, and highly recommended, is the Peak Atlas semiconductor tester:

Peak Electronic Design Limited - Atlas DCA - Semiconductor Analyser - Model DCA55

 

[daredavel]

thanks guys!! i'll try it!! pretty cool device!! i want one..^^