AMPS3

AMPS3 Stereo Audio Power & Headphone Amp 3W

AMPS3 stereo audio power amplifier 2x1.5W ptp (Class D)

Frequency Response: 30Hz-15kHz -3db
Gain: max. 24db (16 times the voltage gain)
Power: 1.5W+1.5W ptp with 4Ω load at 5V
Minimum load: 4Ω (4Ω-32Ω optimal)
Max. input voltage: 10VAC
Input impedance: 60kΩ
Output: unbalanced R+ GND L+
Max. output voltage: 2.5V
Output Impedance min 2Ω
Noise: < 100uV
Clipping: from > 0.3V AC input voltage
permanently short-circuit proof
Thermal shutdown in case of overload

operating voltage: +5V (up to 1.2A at full power, normally 100mA 0.5W)

Use: headphones, to some degree none active speakers

The AMPS3 module uses a 3W Class-D audio amplifier chip, delivering high-quality playback with low noise levels. The noise depends on the output power. The input voltage and should therefore be > 100mV ptp.

The Class D power amplifier drives the loudspeakers without a low-pass output filter. Due to this filterless design, however, the output signal is only suitable for driving further power amplifiers if a 250kHz low-pass filter is switched into the signal path. (Plugging 32Ω stereo headphones into the stereo out socket and connecting to the power amp via the output sockets from channels 1+2 to the power amp also serves this purpose). The actual AMPS3 Module uses 2Ω Resistore in all outputs inorder to prevent accidental shortages when plug/unplug the headphone jacks. The AMPS3 power is not throttled and delivers the output signals to GND, so that they can be reused in the system. Input voltages of up to 10V AC can be attenuated with the gain controls in order to obtain full modulation. Larger input voltages lead to clipping at the output, which in the long run damages the lifetime of the output transistors.

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