VU meter and buffer circuit for amp - compressing readings logarithmically

[metaphile]

Huge apologies, everyone, for the LONG delay here. I've attached the gerbers as well as a PDF copy of the KiCad schematic of the final design.

I hope this is helpful. I ended up getting Modushop to make me a custom cut and screen printed front panel for my 4U case to mount the meters inside. I think it looks quite nice! (I may have borrowed the old RCA logo)... Photo attached.

 

[metaphile]

I should add: if anyone is interested in this exact circuit, I have extra boards I'd be willing to part with for the cost of postage within the US (no promises that I will mail them expediently). Just send me a PM if you're interested.

Attached: pic of the boards + pic of me testing the boards plus the +/- 12VDC supply board I used.

I ended up mounting the board on the back of the front panel between the two meters.

 

[DontHertzMe]

That looks great! Out of curiosity, what board did you use for the power supply?

 

[metaphile]

I bought this regulator from banggood, which I powered from a 12VDC wall wart.

Because the lamps require so much current on the positive rail (creating a lot of heat on the regulator board) I am powering those directly from the 12VDC wall wart and the board is only providing power to the buffer circuit board.

 

[NeonHypercube]

Great job on this. Any idea how the circuit might be adapted for differential input (XLR)?

 

[dotneck335]

Here's some good information about meter circuits:
https://sound-au.com/articles/meters.htmhttps://sound-au.com/project55.htmhttps://sound-au.com/project128.htmhttps://sound-au.com/project180.htm