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It runs on a 13.8V supply and can provide 36W RMS OR 70W of music power. It is based on a Philips class-H audio amplifier IC. With a 13.8V supply, our new Mighty Midget Amplifier can provide up to 36W RMS continuous into a 4-ohm load. What really gets you to pay attention, though, is the 70W of output power it can produce under dynamic (music) signal conditions. The circuit diagram and the pictures show that the Mighty Midget just needs a few pieces.
Although its dimensions are small (104 x 39 mm), its power output is anything but modest. It is constructed on a PC board. Furthermore, the distortion and noise statistics are also really good. The TDA1562Q IC, which Philips refers to as a "monolithic integrated Bridge-Tied Load (BTL) class-H high-efficiency power amplifier," is the central component of the circuit. It is intended for use in mains applications such as TV sound and mini/midi audio components, in addition to automotive audio and portable PA work. It is packaged in a 17-pin "DIL-bent-SIL" plastic container.
Output power:----------------------36W RMS into 4R
Music power:-----------------------70W into 4R
Frequency response:---------------1dB down at 28Hz and 55kHz
Input sensitivity:-------------------130mV RMS (for 36W into 4?)
Harmonic distortion:----------------typically 0.2% (see graphs)
Signal-to-noise ratio:----------------95dB unweighted (22Hz to 22kHz)