Electronics > Beginners
How to wire this setup?
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Youkai:
I wonder if not having the grounds tied together before is what was causing it to be super dim when it was wired with the transistor in the correct orientation. That's the only thing I can think of that has changed between then and now. I didn't have the jumper from Arduino ground to Wall Wart ground before.
MarkF:
I believe that was exactly the cause of the LEDs beinig super dim.  There would not have been any return current path for the Arduino outputs.  You could try to verify this by removing the ground jumper to the Arduino.

Sorry it took me so long to reqlize you were using the BC547B transistor instead of the 2N3904 and that you had them wired correctly in the first place.
Brumby:

--- Quote from: Youkai on May 21, 2018, 06:30:32 pm ---I wonder if not having the grounds tied together before is what was causing it to be super dim when it was wired with the transistor in the correct orientation. That's the only thing I can think of that has changed between then and now. I didn't have the jumper from Arduino ground to Wall Wart ground before.

--- End quote ---

That is why I said this:


--- Quote from: Brumby on May 17, 2018, 04:48:21 am ---
--- Quote from: MarkF on May 17, 2018, 04:09:09 am ---
* The Arduino GND and the 12V GND should be connected together.  Your 12V supply IS isolated?  Correct?

--- End quote ---

This would be the FIRST thing I would attend to.

--- End quote ---

Without a solid ground connection, any voltages between the two sections of your circuit would have been from parasitic and non-obvious sources.  Getting anything to happen was a miracle.
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