{"product_id":"4-and-tda1387-chip-directly-replace-tda1541-audio-decoding-board-saa7220pic-digital-to-analog-converter","title":"4 and TDA1387 chip directly replace TDA1541 audio decoding board SAA7220PIC digital-to-analog converter","description":"\u003ch1\u003eSPECIFICATIONS\u003c\/h1\u003e\u003cp\u003e\u003cspan\u003eBrand Name\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eNONE\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eCondition\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eNew\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eHigh-concerned chemical\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003enone\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eOrigin\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eMainland China\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eType\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eModule\u003c\/span\u003e\u003c\/p\u003e\u003cdiv class=\"detailmodule_html\"\u003e\u003cdiv class=\"detail-desc-decorate-richtext\"\u003e\n\u003cdiv class=\"\"\u003e\n\u003cdiv class=\"\"\u003e\n\u003cstrong\u003e\u003cspan style=\"color:rgb(41, 128, 185)\"\u003e\u003cspan style=\"font-size:20px\"\u003e\u003cspan style='font-family:\"Comic Sans MS\", cursive'\u003eWhy choose 4 parallel connection instead of 8 parallel connection?\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e \u003cspan style=\"color:rgb(0, 0, 0)\"\u003e\u003cspan style=\"font-size:20px\"\u003e\u003cspan style='font-family:\"Comic Sans MS\", cursive'\u003e\u003cbr\u003e\n\u003cbr\u003e\nBecause the TDA1541 is \"inhaling\" about 2MA of current per channel, there is 0.002*R (IV resistor) V DC voltage at the output.\u003cbr\u003e\n\u003cbr\u003e\nIn accordance with the 1.8K resistor: 1.8K * 0.002 = 3.6V at the coupling capacitor side\u003cbr\u003e\n\u003cbr\u003e\nThe TDA1387 is \"exhaled\" 0.54MA of current per channel, 4 and is 2.16MA of current, the out side has -0.00216*R(I\/V resistor) V DC voltage.\u003c\/span\u003e\u003cbr\u003e\n\u003cbr\u003e\n\u003cspan style=\"font-family:Arial,Helvetica,sans-serif;\"\u003eAccording to the calculation of 1.8K resistor: the coupling capacitor has -1.8K*0.00216=-3.888V\u003cbr\u003e\n\u003cbr\u003e\nNote for substitution\u003cbr\u003e\nBecause the TDA1541 output is positive voltage, so the circuit on the positive side of the coupling capacitor connected to the 1541 pin.\u003cbr\u003e\nThe TDA1387 is a negative output, so after the replacement, the coupling capacitor on the board should be reversed, or use\u003cbr\u003e\nUse a non-polarized capacitor.\u003cbr\u003e\n\u003cimg data-id=\"ckeditor_img35\" referrerpolicy=\"no-referrer\" src=\"https:\/\/ae01.alicdn.com\/kf\/Sd6f25c7b97df4cc4b09c54439bfec71c0.jpg?width=800\u0026amp;height=800\u0026amp;hash=1600\"\u003e\u003cimg data-id=\"ckeditor_img36\" referrerpolicy=\"no-referrer\" src=\"https:\/\/ae01.alicdn.com\/kf\/Sbd1bed8ea6da498ab260e97e15bf85fcl.jpg?width=800\u0026amp;height=800\u0026amp;hash=1600\"\u003e\u003cimg data-id=\"ckeditor_img37\" referrerpolicy=\"no-referrer\" src=\"https:\/\/ae01.alicdn.com\/kf\/S332f01faea3b4586ace6f8dec76372d9T.jpg?width=800\u0026amp;height=800\u0026amp;hash=1600\"\u003e\u003cimg data-id=\"ckeditor_img38\" referrerpolicy=\"no-referrer\" src=\"https:\/\/ae01.alicdn.com\/kf\/S8849f9e8b2c944838dbd41c48d020dc2Y.jpg?width=800\u0026amp;height=800\u0026amp;hash=1600\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e \u003cspan style=\"font-family:Arial,Helvetica,sans-serif;\"\u003e \u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\r\n","brand":"Yoeruyo","offers":[{"title":"Default Title","offer_id":55368919253291,"sku":"\u003cnone\u003e","price":77.36,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1000\/5744\/8747\/files\/S0489f343f95c4c1db911532a4a71a4061.webp?v=1788318552","url":"https:\/\/yoeruyo.com\/products\/4-and-tda1387-chip-directly-replace-tda1541-audio-decoding-board-saa7220pic-digital-to-analog-converter","provider":"Yoeruyo","version":"1.0","type":"link"}