Adafruit Stereo 2.1W Class D Audio Amplifier Tpa2012

This Incredibly Small Stereo Amplifier Is Surprisingly Powerful - Able To Deliver 2 X 2.1W Channels Into 4 Ohm Impedance Speakers (@ 10 Pct Thd). Inside The Miniature Chip Is A Class D Controller, Able To Run From 2.7V-5.5Vdc. Since The Amp Is A Class D, It'S Incredibly Efficient (89 Pct Efficient When Driving An 8 Ohm Speaker At 1.5 Watt) - Making It Perfect For Portable And Battery-Powered Projects. It Has Built In Thermal And Over-Current Protection But We Could Barely Tell It Got Hot. This Board Is A Welcome Upgrade To Basic ''Lm386'' Amps. The Inputs Of The Amplifier Go Through 1.0Uf Capacitors, So They Are Fully 'Differential' - If You Don'T Have Differential Outputs, Simply Tie The R- And L- To Ground. The Outputs Are ''Bridge Tied'' - That Means They Connect Directly To The Outputs, No Connection To Ground. The Output Is A ~300Khz Square Wave Pwm That Is Then 'Averaged Out' By The Speaker Coil - The High Frequencies Are Not Heard. All The Above Means That You Can'T Connect The Output Into Another Amplifier, It Should Drive The Speakers Directly. Comes With A Fully Assembled And Tested Breakout Board With 1.0Uf Input Capacitors. We Also Include A Dual Mini Dip Switch For Setting The Amplifier Gain On The Fly, 3.5Mm Screw-Terminal Blocks So You Can Easily Attach/Detach Your Speakers, And Some Header In Case You Want To Plug It Into A Breadboard. You Will Be Ready To Rock In 15 Minutes. Speakers Are Not Included, Use Any 4 Ohm Or 8 Ohm Impedance Speakers. Output Power: 2.1W At 4 Ohn, 10 Pct Thd, 1.4W At 8 Ohm, 10 Pct Thd, With 5V Supply Psrr: 77 Db Typ @ 217 Hz With 6 Db Gain Designed For Use Without An Output Filter, When Wires Are Kept At Under 2''-4'' Long Four Pin-Selectable Gains: 6Db, 12Db, 18Db And 24Db. Select With The Onboard Switches Or By Setting The G0 And G1 Breakout Pins (See Schematic For Breakout Board Showing Gain Pin Settings For Details) Excellent Click-And-Pop Suppression Thermal Shutdown Protection Independent Channel Shutdown Low Current Draw: Typ 6Ma Quiescent And 1.5Ua In Shutdown Mode Note: The Terminal Blocks Included With Your Product May Be Blue Or Black