{"product_id":"adafruit-stemma-piezo-driver-amp-pam8904","title":"Adafruit STEMMA Piezo Driver Amp - PAM8904","description":"\u003cp\u003ePiezos make noise when you put an AC voltage across them: and the bigger the Vpp the louder they are. With your standard 3V logic microcontroller you can make 3Vpp with a PWM out, or 6Vpp differential with two complimentary outputs. But what if you want even louder? Or if you're using a piezo to sense distance using ultrasonic bounces?\u003c\/p\u003e\n\u003cp\u003eWe found the nifty PAM8904, which is an amplifier specifically designed for driving \u003ca href=\"\/ru\/products\/large-enclosed-piezo-element-w-wires\"\u003epiezo elements\u003c\/a\u003e - and unlike audio amplifiers, it's good for up to 300 KHz! It's a switched-cap piezo driver that has bridge-tied load (BTL) output and up to 3x voltage multiplication thanks to a built-in boosting circuit for up to ~13Vpp.\u003c\/p\u003e\n\u003cp\u003eWe whipped up a quick breakout in our \u003ca href=\"\/ru\/products\/stemma-jst-ph-3-pin-to-male-header-cable-200mm\"\u003e2mm JST-PH STEMMA\u003c\/a\u003e form factor to make it easy for anyone who wants to beep their boops very loudly.\u003c\/p\u003e\n\u003cp\u003eUsage 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 okay but 50% will probably work best. There's 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 4x Vin peak-to-peak across the piezo lines. Connect your piezo to the terminal block and you're ready to rock.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlease 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 sort of 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.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/ru\/products\/large-enclosed-piezo-element-w-wires\"\u003ePiezo element\u003c\/a\u003e and \u003ca href=\"\/ru\/products\/stemma-jst-ph-3-pin-to-male-header-cable-200mm\"\u003e3-pin JST PH cable\u003c\/a\u003e \u003cstrong\u003eNOT\u003c\/strong\u003e included! But we stock them in the shop if you want to pick them up separately.\u003c\/p\u003e\n\u003cp\u003e\u003ciframe width=\"560\" height=\"315\" src=\"\/\/www.youtube.com\/embed\/iRbaohHzbNA?si=MxR_OnlLMDTwFp2P\u0026amp;start=138\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen=\"allowfullscreen\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eProduct Dimensions: 22.5mm x 17.7mm x 10.2mm\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eProduct Weight: 2.8g\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan\u003eResources\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/learn.adafruit.com\/adafruit-stemma-piezo-driver-amp\"\u003e\u003cspan\u003eProduct Wiki\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Adafruit","offers":[{"title":"Default Title","offer_id":50847587303697,"sku":"ADA5791","price":4.8,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0901\/6285\/6209\/files\/adafruit-stemma-piezo-driver-amp-pam8904-the-pi-hut-ada5791-40917526970563.jpg?v=1735215966","url":"https:\/\/abcd3032.myshopify.com\/ru\/products\/adafruit-stemma-piezo-driver-amp-pam8904","provider":"Tayyab Zak","version":"1.0","type":"link"}