42 Bands Audio Spectrum Analyzer - SMD

This board layout is intended to accomodate for 42 Bands Audio Spectrum Analyzer using 6 x 7 Band MSGEQ ICs (SOIC-8) and 2 x Si5351 surface mount clock generator circuits. Board size is 90.0mm x 54.5mm which is reasonable size for using a Hot-plate. Added to the design is a TPA3116D2 audio amplifier 2 x 50 Watts  with left and right volume control which needs 12-24V supply and a heatsink. Available on Aliexpress, search HX-M562 50W + 50W stereo for $0.99 each.
https://www.youtube.com/watch?v=HEnO0TTUdRU

To order 5 boards, with laser cut Stencil plus shipping is $35. Assembly will be additional $80. LEDs can be ordered at BTF-Lighting.com for $88, 2 x 22x22 panels (WS2812B Mini Led SMD 2427).

March 03 2025 - Received 5 bards and aquired the parts needed .. 
Completed building one board and one 42-band LED panel everything tested okay, including the oprional Mic input.

BOM - tentative (prices may vary): ($36.53 without the LED panels) 

I suppose you can use ESP32_Cloner_By_GlitchTronics to upload the .bin files.

GitHub - vishalsoniindia/ESP32_Clonner: In the tutorial there is two method to Clone one ESP32 Code to another ESP32.

ESP32 Dev 38-pin Type-C  x1 = 3.50  ESP32 Development Board TYPE-C MICRO USB CH340C WiFi+Bluetooth Ultra-Low Power Consumption Dual Core ESP32-DevKitC-32 ESP-WROOM - AliExpress 502
MSGEQ7 Analyzer ICs        x5 = 25.00  MSI MSGEQ7 Seven-Band Spectrum Analyzer Chips – Whizoo Electronics
Si5351 smt chips                 x2 = 2.40  (5-10piece)100% New SI5351 SI5351A-A-GTR 5351 SI5351A-B-GTR MSOP10 Chipset - AliExpress 502
Audio Amp 2x50watts          x1 = 1.36  1-10PCS TPA3116D2 Digital Audio Amplifier Board Class D Voice Sound Amplifier Module Two Channels Double 50W*2 - AliExpress 502
M18 BlueTooth                    x1 = 1.96  1-6pcs MH-MX8 MP3 Decoder Board M18 M28 M38 Bluetooth-Compatible 4.2 MP3 Wireless Audio Receiver Module DIY Refit Loudspeaker - AliExpress
5v DC-DC buck converter   x1 = 0.50  DC-DC Buck Converter Step Down Module Adjustable Voltage Regulator Module 5V-30V To 3.3V 5V 9V 12V 3A for Car Motorcycle Battery - AliExpress 502
25Mhx 4-pin xtal3.2 x 2.5   x2 = 0.33  10PCS 3225 4PIN 25Mhz 25M 25 MHz 3.2*2.5mm Passive SMD Quartz Resonator Crystal - AliExpress 502
10Kohm variable Potmeter x5 = 0.62  10pcs RV09 Horizontal 12.5mm Shaft 3pin Potentiometer B102 1K 2K 5K 10K 20K 50K 100K 500K B103 B503 0932 Adjustable Resistor - AliExpress 502
220uF electrolitic  Cap        x3 = 0.11  50PCS 16V220UF In-line Electrolytic Capacitor 220UF 100UF 16V Volume 6X7mm 5X7 - AliExpress 502
DC jack                               x1 = 0.10  10PCS 5.5x2.1MM DC-005 Black DC Power Jack Socket DC Connectors Supply Barrel-Type Right Angle PCB Mount Terminal - AliExpress 502
Audio 3.5mm jacks             x2 = 0.30  2.5MM 3.5MM Audio Jack Female Connector Through Holes PCB DIP SMD Headphone Jack Socket PJ-242/301M/313E/320D/327A/391/392/393 - AliExpress
Terminal 3 pin for LEDs      x2 = 0.20  20pcs Kf350-2p 3p 3.5mm 300v 10a Pitch 2 3 Pin Spliceable Plug-in Pcb Screw Terminal Block Connector For 24-18 Awg Cable Kf350 - Terminals - AliExpress
Terminal 2 pin for Audio      x2 = 0.15  20pcs Kf350-2p 3p 3.5mm 300v 10a Pitch 2 3 Pin Spliceable Plug-in Pcb Screw Terminal Block Connector For 24-18 Awg Cable Kf350 - Terminals - AliExpress
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LED panel                             x2 = 66.17  Ws2812 full color LED screen RGB color dot matrix 16 * 32 dot matrix SPI protocol 2020 small light beads - AliExpress 39