Electrifier AMP100 Class D Bt 5.0 Amplifier Board 2x100W 4-8 Ohm 5-24V | Wireless Bluetooth, AUX in and 3.5mm out, USB U-disk playback | stepless volume with play and pause push control

The Electrifier AMP100 is a compact Bluetooth amplifier board built for makers who want stereo sound from a small footprint. Pair a phone over Bluetooth 5.0, plug a source into the 3.5mm AUX input, or load music onto a FAT32 USB drive up to 32GB — the board handles all three, and a separate 3.5mm audio output passes the signal on to an active speaker or recorder when you need it. At its core is a Class D output stage driving two independent channels. Into 4 ohm speakers it delivers up to 100W per channel; into 8 ohm speakers it runs at 50W per channel, so it pairs comfortably with the 4 to 8 ohm drivers found in most bookshelf, desktop and custom enclosures. The switching design keeps the board compact and cuts wasted heat compared with linear amplifiers, and a finned heat sink mounts onto the power device to help it hold up over longer sessions. A DC input from 5 to 24V gives flexibility with adapters, battery packs and bench supplies, with 19V recommended to reach full rated output. Volume runs through a rotary encoder rather than a stepped potentiometer, giving smooth, detent-free adjustment across the range. A short press plays or pauses the track and a long press powers the board on or off — handy when it lives inside a sealed speaker build. That makes the AMP100 a practical core for home and desktop speakers, workshop and garage audio, replacement amp modules and custom Bluetooth speaker projects. It ships with a heat sink, a screw-terminal DC adapter and the volume knob, ready to wire in. Every Electrifier board is manufactured in an ISO-certified facility and backed by a one-year warranty, with support that understands how builders actually use these modules.