When I was a kid, I saw my friends dad open up his audio cabinet for the first time to put on a movie for us and there I saw a huge array of LEDs come to life as the 20th century fox tune blasted through the speakers, I was mesmerized as the bars danced in time to the audio. That was my first love of VU meters, and now that I'm 20years older and earning a bit more then a paperboy in the 90's. I to want to have my own multi channel UV meter display.
On aliexpress I found a "VU Meter Level Indicator Amplifier Board Dual Channel 32 LED MCU Adjustable Display Pattern LED"
https://www.aliexpress.com/item/VU-Meter-Level-Indicator-Amplifier-Board-Dual-Channel-32-LED-MCU-Adjustable-Display-Pattern-LED/32810039688.html?spm=2114.10010108.1000014.5.30ed99cdJyHugN&traffic_analysisId=recommend_3035_null_null_null&scm=1007.13338.80878.000000000000000&pvid=58acd4ca-23ca-437d-adb1-aa9d46953612&tpp=1I'm wondering if anyone knows of a board or circuit that will take an audio feed from a stereo jack, and out put a feed suitable for one of these modules. It would need a tune-able upper and lower cut off threshold, so that one board and module can control one frequency band of of the audio spectrum. This way one module can be set for a certain band by playing a tone and tuning that board and my hope is that it can be scaled so you can have as many bands in the VU meter that you want 4,8,16,32 and my hope eventually, 64 band.
If it was something I could solder up on a thin strip of perf board, or maybe get a simple pcb made for it about the same width as the module that would be great I'd like to say clear of microprocessors and coding as I see it more as a plug in and tune module some thing that could be installed in a euro rack synth or a 19" rack unit if you made a front panel for it I don't want it to control the volume or effect the audio it is only to display,
Ive made a rough block diagram of how i think it might work
if it was possible to have one board capable of doing all the bands with only changing the values of the trim pots that would be good. But as you probably can tell my actual circuit design and component selection knowledge is non existent but I'd like to think this idea could be made in to a "solder your own" style of kit for common folk and diy synth or just any one that wants a cool LED UV meter
Any help ,designs or guidance would be appreciated in the far brained plan
-Sizigi