| Electronics > Beginners |
| Pulling my hair out here .... |
| << < (3/4) > >> |
| LateLesley:
I'll second what silverback says. That output capacitor is not connected to the pin with the yellow wire. The output capacitor is connected at row 14 - row 13, but the pin and yellow wire are on row 12, unconnected. At least from what I can see in the pic. |
| austfox:
I agree with Andy that you have the collector and emitter around the wrong way. Emitter (pin 3) should be going to ground, looks like it is going to 12V. |
| g0mgx:
Looks like the output cap is connected to fresh air. I really dont like the 2 separate resistors in the same hole connecting to the base either. |
| Rtwo:
Plenty to look at, thanks all Unfortunately I've not had time today to look at it further. I'm now away at work until Christmas so I'll revisit it then. |
| Rigolon:
--- Quote from: austfox on December 01, 2019, 02:37:15 pm ---I agree with Andy that you have the collector and emitter around the wrong way. Emitter (pin 3) should be going to ground, looks like it is going to 12V. --- End quote --- Transistor seems to be OK. 2n2222a pinout is Emitter (1) - Base (2) - Collector (3). Emitter will be pin 3 with the p2n2222a (PNP transistor) But I agree that output capacitor is not connected with yellow wire and test pin. That should be your problem, and I didn't do the math but double check if you are biasing your transistor correctly. |
| Navigation |
| Message Index |
| Next page |
| Previous page |