Ambient Background Sound Part 3: Here is the list of items used. Summary: The MP3 player requires 4v so I used a power rectifier which has a small screw allowing you to reduce the output voltage. It also has a display so you can see the input or the output voltage. The 4ohm speaker is connected to the board and by having the MP3 file on the micro SD card inserted into the board, basically is the high level. List of items: 1 - Power Source: (Drives all 6 of my boards) 12v 3a Power Supply Supplier: Amazon Cost: £7.99 2 - Power Rectifier: (1 for all 6 MP3 boards) Adjustable DC-DC Voltage Rectifier / LED Driver (#LED02) Supplier: JS Models Cost: £6.50 3 - Power Connector: VCE DC Power Connector Male Female 5 pairs 5.5mm x 2.1mm 13v Power Jack Plug for CCTV Brand: VCE Supplier: Amazon Cost: £3.99 4 - MP3 Players: Voice Sound Playback Module Arduino MP3 Player Brand: Cncedi Supplier: Amazon Coat: £7.99 5 - Micro SD Card: Storage Capacity: 32Gb x2 (could use smaller capacity) Brand: Kootion Supplier: Amazon Cost: £7.64 6 - Speaker: LuluDa 4xSpeaker 3w 8 Ohm Mini Speaker Brand: LulaDa Cost: £7.59 7 - Wiring: JST-PH 2.0 plug connector. JST 2 pin micro electrical Male / Female (30 pairs) Brand: Generic Supplier: Amazon Cost: £7.59 8 - Computer Software: Audacity (Free software) 9 - Sound Sources My own videos where I take the sound and create MP3’s BBC Sound Effects: (Free) https://sound-effects.bbcrewind.co.uk 10 - Control Box (Optional but happen to have one) A4 Layout Control Panel / Mimic Panel Enclosure Supplier: Scale Model Scenery Cost: £21.99

Posted by Rob York at 2026-04-14 19:24:01 UTC