James, Thanks for the response.
I was quite surprised that the circuit didn’t work as it seems to me to be a simple “no brainer”! But as I mentioned I’m not that familiar with designing circuits. I did forget to mention that the capacitor I use as Cin is really way out from what the Datasheet suggests. Datasheet shows .33µF and the closest electrolytic I have is a 10µF…wondering if this filter cap is even necessary as the datasheet says “Cin is required if regulator is located an appreciable distance from power supply filter.“ It doesn’t define “Appreciable Distance”!
I included a couple more photos below of what I’m doing. I also drew up a schematic of what I have. I did notice that the LM7809 I’m using is a “Positive Voltage Regulator”. Is it possible I should be using a LM7909 to regulate the negative voltage instead, or as well, in a split configuration (shown in the datasheet for the LM7909 and included below).
I won’t waste any more of your time on this. I will try removing Cin and see if that doesn’t eliminate whatever feedback that’s getting to the meters. I will either connect the meters to batteries or build a 9V power supply separate from the main PS if all that fails.
I want to thank you for spending the time to put together your AddOhms videos…it’s actually what made me decide to build this project. I would like to start getting into microcontrollers and dinking around with designing circuits to keep my aging mind stimulated! I’m old enough to have started my electronics hobby when tubes were the thing you had to work with for switching and amplification and making AC in to DC.
I tried to include separate photos of each item but I received and error that new users can only include one photo in a post so I combined them in this single photo…hope it comes through!