A 2.5W audio amplifier to give some punch to your Maker project
A little super-powerful super-strong mono amplifier - capable of delivering up to 2.5 Watts on a speaker with a 4-8 Ohm impedance. This small component contains a class D controller capable of operating with a voltage between 2.0V and 5.5C continuous. As the amplifier is class D, it is very efficient (efficiency above 90% on a speaker of 8Ω above 1/2 watt) making it a perfect tool for portable projects or powered by batteries. It has a thermal protection (and over-current) are nevertheless careful because the circuit can become terribly hot well before the activation of the thermal protection. The card has a small potentiometer to adjust the volume (so you can decrease the volume below the default gain of 24dB).
This card is a nice upgrade compared to a simple amplifier "LM386"!
The inputs A+ and A- of the amplifier pass through a capacity of 1.0uF, so it is a 'differential' amplifier.
If you don't have a differential output, then connect the Audio output to the ground.
The output is of type "Bridge Tied", which means that the output pins are connected directly to the pins of the speaker, no connection to the ground.
The output is of type PWM (square wave) at 250kHz high frequency and it is the speaker coil that performs "average" signal - the high frequency signal at 250kHz is inaudible.
All this means that you have to connect this product directly to a speaker, you can't connect the output to another amplifier.
Use with a speaker having an impedance of 4 Ohms and more.
The product is delivered fully assembled (except PinHeader and terminal block) and tested by Adafruit. The product contains amplification, a PinHeader and a 3.5mm terminal block to easily connect/disconnect your amplifiers. You will be ready in less than 15 minutes! The speaker and breadboard used for illustration purposes are not included.
- Output power: 2.5W to 4Ω, 10% THD, 1.5W to 8Ω, 10% THD, with 5.5V power supply
- 50dB PSRR at 1KHz
- Design without filter, with ferrite + capacity on the output.
- Gain set at 24dB, potentiometer (on the card) to adjust the input volume.
- Thermal protection and short-circuit.
- Low current consumption: 4mA at idle and 1µA in shutdown mode (off)
- Dimensions: 15mm x 24mm x 2mm (without pinHeader)
See the images of the product sheet. One of them explains how to connect the PAM8302 to a Raspberry-Pi 2.