I don't know about the hardware, but I wouldn't think the software would be that difficult.
Jack, W8TEE
On Tuesday, June 19, 2018, 2:40:16 PM EDT, Arv Evans <arvid.evans@...> wrote:
Seems that a simple LM3914 bargraph driver coupled with a log detector like the AD8307 might be easier to build than using a micro-controller and writing software.