| Electronics > Beginners |
| Pulling my hair out here .... |
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| austfox:
--- Quote from: Rigolon on December 03, 2019, 01:22:08 pm --- Transistor seems to be OK. 2n2222a pinout is Emitter (1) - Base (2) - Collector (3). Emitter will be pin 3 with the p2n2222a (PNP transistor) . --- End quote --- Oops, I was indeed looking at the P2N2222A datasheet. It seems both are NPN transistors. To cause even more confusion, at least one retailer is linking their 2N2222As to a P2N2222A datasheet. |
| Jwillis:
The P2N222A and 2N222A are both NPN . The only difference is the PN222A is a plastic case and the 2N222A is a metal case. You have the plastic case . Pin 1 is collector ,2 Base and pin 3 Is the emitter. 2N222A https://www.onsemi.com/pub/Collateral/P2N2222A-D.PDF P2N222A https://media.digikey.com/pdf/Data%20Sheets/ST%20Microelectronics%20PDFS/2N2219A,%202N2222A.pdf Besides you take you out put signal from the collector not the emitter. your transistor is backwards |
| mikerj:
--- Quote from: Jwillis on December 05, 2019, 07:25:28 am ---The P2N222A and 2N222A are both NPN . The only difference is the PN222A is a plastic case and the 2N222A is a metal case. You have the plastic case . Pin 1 is collector ,2 Base and pin 3 Is the emitter. --- End quote --- For extra confusion, there is also the PN2222A that uses the more common EBC pinout. |
| Ed.Kloonk:
--- Quote from: not1xor1 on December 01, 2019, 06:56:18 am ---Do you know what "subject" means? Please edit your thread subject --- End quote --- Being that it was posted in Beginners area of the forum, what did you honestly really expect them to say? |
| austfox:
--- Quote from: Ed.Kloonk on December 05, 2019, 09:04:25 am --- Being that it was posted in Beginners area of the forum, what did you honestly really expect them to say? --- End quote --- Maybe ‘Problem with my common emitter amplifier circuit’. They have a scope so are probably a bit more advanced than a true beginner. |
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