The PAM8904 amplifier is the ideal solution to get the most out of your piezo speaker. It is designed for driving piezo elements and boasts BTL output, up to 300 kHz frequency, and a built-in boosting circuit capable of delivering up to 3x voltage multiplication - up to ~13Vpp. Traditional 3V logic microcontrollers enable 3Vpp through PWM output or 6Vpp in differential with two complimentary outputs. But for a noisier and higher-quality sound, the PAM8904 is the amplifier of choice.
We whipped up a quick breakout in our 2mm JST-PH STEMMA form-factor to make it easy for anyone who wants to beep their boops very loudly.
Usage is easy: power with 3 to 5VDC on the Vin and GND pins. Then provide a square wave on the signal pin, from 20Hz to 300KHz - any duty cycle is ok but 50% will probably work best. Theres a dual DIP switch to set the gain: you can set it to off (zero gain), x1 gain, x2 gain and x3 gain. The output is differential so 2x gain will give you 4xVin peak-to-peak across the piezo lines. Connect your piezo to the terminal block and you're ready to rock.
Please note: If you are powering the driver from 5VDC, don't set the gain to x3 because the 15V output is higher than the driver is specified for. (Yeah we also sorta wondered why the chip manufacturer allows it). So if you are using 3.3V power, x3 gain is OK and will give you about 10V out but if you're powering with 5V use 2x gain max to keep the max voltage at 10V.
Piezo element and 3-pin JST PH cable not included! But we stock em in the shop if you want to pick up separately.
Technical Details
Product Dimensions: 22.5mm x 17.7mm x 10.2mm / 0.9" x 0.7" x 0.4"
Product Weight: 2.8g / 0.1oz
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