Bring back the speakers from the garage and throw the party of the year. Just don’t get carried away, otherwise you may have some loud banging on your walls.
At first glance, an amplifier is a big, bulky “black box” with wires and cables and magic.
This amplifier from the Troyka Module Series is hundreds of times smaller. We can achieve this by using a class-D pulse amplifier.
The sound wave is modulated by triangular oscillations and turns into pulse-width modulated pulses. The pulses, in turn, open and close transistors whose output is two half-waves. The waves are then combined with a low pass filter and we hear an amplified analog signal.
Synchronous operation the pair of transistors, a.k.a. “key mode”, increases the efficiency of the amplifier up to 95%. Other amplifiers can’t even dream of this kind off efficiency.
The module has two groups of contacts:
- Signal (L) - audio input signal on the left channel. Connect to a sound source. For example, to a phone or DAC microcontroller.
- Power (V) - power amplifier. Connect to a power source of 3 to 5 volts. For example, to the power supply or the output voltage of a microcontroller.
- Ground (G) - amplifier ground. Connect to ground.
- Signal (M) - turn on the “Mute” mode. Designed to attenuate the input signal, turns off the input sound source from the chip. Active at low.
- Signal (S) - the inclusion of the “SHND”. Software amplifier on/off. Active at low.
- Signal (R) - audio input signal of the right channel. Connect to a sound source. For example, to a phone or DAC microcontroller.
To connect the load, there are two terminals:
- Signal (L+) - positively amplified signal of the left channel. Connect to the positive terminal of the first speaker system.
- Signal (L−) - negatively amplified signal of the left channel. Connect to the negative terminal of the first speaker system.
- Signal (R+) - positively amplified signal of the right channel. Connect to the positive terminal of the second speaker system.
- Signal (R−) - negatively amplified signal of the right channel. Connect to the negative terminal of the second speaker system.
You can connect the amplifier to a phone, music player, or laptop; you don’t need a microcontroller.
If you want to voice your DnD campaign or teach a robot to speak, use a control board that supports a digital-to-analog converter.
- Amplifier Chip: PAM8403
- Amplifier Type: Class D
- Frequency: 20-20000 Hz
- Gain: 24 dB
- S / N Ratio: 80 dB
- Dynamic Range: 90 dB
- Number of Channels: 2
- Operating Mode: Mono / Stereo
- Output Power: 1.5 W × 2 channels (with a load of 8 Ohms), 3.0 W × 2 channels (with a load of 4 Ohms)
- Efficiency: ≤ 95% (does not require cooling fans)
- Power Supply: 3.3–5 V
- Current Draw: up to 16 mA (no signal); up to 1 A (in peaks)
- Input Interface: two digital-to-analog signals from a microcontroller or an external player (Troyka contacts)
- Output Interface: two amplified audio signals to acoustic devices (contacts for screws)
- Overheating Turn Off: > 120 °C (248 °F)
- Dimensions: 25.4 × 25.4 mm (1 × 1 in)