Board amplifier power supply board

Feature:   Onboard 2W mono amplifier (5V power supply up to 3W) can directly connected speakers (recommended with 4Ω3W speakers), 3.5mm gold-plated headphone jack can be accessed by headphones or external audio. With MicroUSB power supply interface, using mobile bank power or USB charger power supply, can also be used 3.7V lithium battery, USB 5V power supply. Support TF card (mobile phone memory card), U disk playback mode. With a speaker terminal without soldering, easy wiring.   1) Support MP3 format, power automatically play, led status turn to red. 2) Support U disk (tested with 32G), TF card (tested with 16G) playing mode, power default TF card mode, if the TF card does not exist automatically jump to U disk mode, and both devices are installed, you can manually set the playback mode, please refer to the key operation instructions.   Key operation instructions:   "Prev / V--" key: "short press" to switch "Previous" song, "long press" to switch "volume down" "Next / v ++" key: "short press" to switch "next song", "long press" to switch "volume increase" "P / P / Mode" key: "short press" to "play / pause" switch, "long press" for the U disk, TF card "mode" select "Repeat" key: "short press" for the "single / full song" cycle switch (no long press function)   Note:   1. Long press time about 2S 2. If you use U disk mode, the recommended 5V power supply, some U disk does not support 3.7V power supply.   Specifications:   Power supply range: 3.7 - 5.5V Product size: 45mm * 36mm   Package includes:   5 x MP3 Lossless Decoder Board

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AC 12V Stereo VU Meter Driver Board Amplifier DB Audio Level Input Backlit Feature: Adopting professional audio VU drive IC, which contains root dynamic compression circuit, effectively avoid small signal pointer, large signal, the phenomenon of pointer to render. This IC with mute function, Mute function feet will get a low level at the moment you turn it on, for avoiding pointer overload Using AC12V power for supply circuit, more convenient using Using double-sided circuit board, for ensuring that the fastness of wire terminals, with fastness bonding pad, not easy to loose Driver board design with beautiful and reasonable layout, without any interference and self-excited phenomenon Specifications: Size: 55 x 66mm Rated voltage: AC 12V Distance of locate holes: 50 x 56mm Diameter of locate holes: 3mm Package included: 1 x VU Meter Driver Board