Electronics > Beginners
Pulling my hair out here ....
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
[0] Message Index
[#] Next page
[*] Previous page
Go to full version