40mm Speakers Expansion

New Product

PUI Audio offers a diverse range of 40mm speakers featuring various mounting options and performance specifications. We are thrilled to announce three new 40mm speakers, each offering a distinct high-fidelity sound experience. Additionally, we are introducing an 18mm speaker with high-temperature surface mount capabilities, catering to specific applications in the medical, consumer, and industrial sectors.

PUI Audio has a speaker for when you need to be heard!

Drive Circuit

There are various means of driving a speaker depending on the specifications. Please reference our Speaker Whitepaper for various power levels. Below is an example of Class D amplifiers that have the primary benefit of higher efficiency when compared to analog amplifiers operating at the same output power level. The amplifier below operates on a single supply (applied to pins B1 and B2) ranging from 2.5V to 5.5V. At VDD = 5.0V, the output power into an 8Ω load is a nominal 1.46W and 2.57W into a 4Ω load.

Utilizing the TPA2038D1 from Texas Instruments, this amplifier has two gain settings determined by the GAIN pin (A2) voltage applied. A gain of 6dB is selected by connecting GAIN to the supply voltage (VDD), and a gain of 12dB is achieved by applying GND.

The input coupling capacitor (CI) value working with the input resistance of IN will determine the high-pass filter’s cutoff frequency formed at the amplifier’s input. The input resistance is a function of the voltage applied to the GAIN pin: with the supply voltage applied, the input resistance is a nominal 150kΩ; with GND applied to the GAIN pin, the input resistance is 75kΩ. Therefore, the capacitor’s value can be determined as follows: CI = 1/2π(R IN )f(-3dB)