Electronics > Beginners

Pulling my hair out here ....

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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.

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