{"product_id":"mofi-t-phonum-2-mm-mc-phono-amplofier-riaa-diy-kit","title":"MOFI-T-Phonum 2  MM\/MC Phono Amplofier RIAA –DIY KIT","description":"\u003cdiv class=\"detailmodule_text\"\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cspan style=\"color:rgb(244, 78, 59);font-size:26px\"\u003eMaterial update information:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color:rgb(244, 78, 59);font-size:26px\"\u003eFrom December 3, 2024, JRC5534D is updated to TI NE5534\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003cdiv class=\"detailmodule_text\"\u003e\n\u003cp style=\"font-family:OpenSans;font-size:20px;font-weight:900;line-height:28px;white-space:pre-wrap;color:rgb(0, 0, 0);margin-bottom:12px\" class=\"detail-desc-decorate-title\"\u003eDIY KIT  Project\u003c\/p\u003e\n\u003cp style=\"font-family:OpenSans;font-size:14px;font-weight:300;line-height:20px;white-space:pre-wrap;color:rgb(0, 0, 0);margin-bottom:12px\" class=\"detail-desc-decorate-content\"\u003eTo complete this project, high level knowledge of electronics and rich experience in terms of soldering and testing are required.\u003cbr\u003e\u003cbr\u003eDue to time zone and language communication restrictions, we can only provide limited technical support, and you need to solve problems by yourself.\u003cbr\u003e\u003cbr\u003eWe do not provide information other than the product introduction page.\u003c\/p\u003e\n\u003c\/div\u003e\u003cdiv class=\"detailmodule_text\"\u003e\n\u003cp style=\"font-family:OpenSans;font-size:20px;font-weight:900;line-height:28px;white-space:pre-wrap;color:rgb(0, 0, 0);margin-bottom:12px\" class=\"detail-desc-decorate-title\"\u003eMOFI-Shiratori MM\/MC Phono Amplofier RIAA  Project\u003c\/p\u003e\n\u003cp style=\"font-family:OpenSans;font-size:14px;font-weight:300;line-height:20px;white-space:pre-wrap;color:rgb(0, 0, 0);margin-bottom:12px\" class=\"detail-desc-decorate-content\"\u003eTech highlights\u003cbr\u003e\u003cbr\u003e1、\tThe circuit employs a particular two-stage RIAA equalization network, one active and one passive, which effectively solves the problems of accuracy, noise and input dynamics that typically arise using traditional active or passive networks.\u003cbr\u003e\u003cbr\u003e2、\tSome DIP switches on the board allow you to adjust the gain (MM and MC modes), the input capacity (to optimize the interface of the MM heads) and the input resistance (for the MC heads).\u003cbr\u003e\u003cbr\u003e3、\tThe circuit employs a total of four individual operational amplifiers for audio applications, two for each channel.\u003cbr\u003e\u003cbr\u003e4、\tThe two-stage RIAA network is low impedance to minimize thermal noise.\u003cbr\u003e\u003cbr\u003e5、\tThis is driven by the first op-amp, which also provides a significant portion of the overall gain. The second op-amp provides the remaining necessary gain, which can be adjusted according to the output level of the cartridge used.\u003cbr\u003e\u003cbr\u003e6、\tThe DIP switches can be activated according to various combinations to obtain 4 gain values, 8 capacitance values and 4 input resistance values.\u003cbr\u003e\u003cbr\u003e7、\tPCB Size:  100x120x1.6mm   1oz Cu, HASL with lead.\u003c\/p\u003e\n\u003c\/div\u003e\u003cdiv class=\"detailmodule_text\"\u003e\n\u003cp style=\"font-family:OpenSans;font-size:20px;font-weight:900;line-height:28px;white-space:pre-wrap;color:rgb(0, 0, 0);margin-bottom:12px\" class=\"detail-desc-decorate-title\"\u003eProduct configuration\u003c\/p\u003e\n\u003cp style=\"font-family:OpenSans;font-size:14px;font-weight:300;line-height:20px;white-space:pre-wrap;color:rgb(0, 0, 0);margin-bottom:12px\" class=\"detail-desc-decorate-content\"\u003eDIY kit: Contains the PCB and the components needed on the PCB, but does not include the power transformer .\u003cbr\u003e\u003cbr\u003eFinished board: Based on the well-tested board on the standard version kit, we verified all key points' voltage, and used the signal generator and oscilloscope for analog waveform double verification. We will not use this board for listening test.\u003cbr\u003e\u003cbr\u003eAll finished pcbs are all carefully hand-soldered and fully tests, so the price is higher and less cost performance. Price-sensitive consumers but with have DIY ability are recommended to choose the kit.\u003c\/p\u003e\n\u003c\/div\u003e\u003cdiv class=\"detailmodule_text-image\"\u003e\n\u003cp style=\"font-family:OpenSans;font-size:20px;font-weight:900;line-height:28px;white-space:pre-wrap;color:rgb(0, 0, 0);margin-bottom:12px\" class=\"detail-desc-decorate-title\"\u003eSchematic \u0026amp; key point of debugging\u003c\/p\u003e\n\u003cp style=\"font-family:OpenSans;font-size:14px;font-weight:300;line-height:20px;white-space:pre-wrap;color:rgb(0, 0, 0);margin-bottom:12px\" class=\"detail-desc-decorate-content\"\u003ePCB comes with component parameters for easy installation.\u003cbr\u003e\u003cbr\u003eWe only refer the schematic of the amplification part of the circuit. If you need full circuit parameter, please read the component value with the PCB by yourself; we do not provide additionally.\u003c\/p\u003e\n\u003cp style=\"font-family:OpenSans;font-size:14px;font-weight:300;line-height:20px;white-space:pre-wrap;color:rgb(0, 0, 0);margin-bottom:12px\" class=\"detail-desc-decorate-content\"\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003cdiv class=\"detailmodule_text\"\u003e\n\u003cp style=\"font-family:OpenSans;font-size:20px;font-weight:900;line-height:28px;white-space:pre-wrap;color:rgb(0, 0, 0);margin-bottom:12px\" class=\"detail-desc-decorate-title\"\u003eDIY KIT Instructions\u003c\/p\u003e\n\u003cp style=\"font-family:OpenSans;font-size:14px;font-weight:300;line-height:20px;white-space:pre-wrap;color:rgb(0, 0, 0);margin-bottom:12px\" class=\"detail-desc-decorate-content\"\u003eSince the PCB holes are plated through, you only need to solder the parts from the bottom of the board. Do not drill or enlarge the holes because that would damage the through-plating.\u003cbr\u003e\u003cbr\u003eClean both sides of the blank PCB with paper towel and isopropyl alcohol or electronics flux remover, then solder the components to the board, starting with the lowest profile parts.\u003cbr\u003e\u003cbr\u003eMake sure the correct part goes into each position on the circuit board. Measure each resistor with your multimeter to ensure it's the proper value.\u003cbr\u003e\u003cbr\u003eClean up the solder flux residue from the board with isopropyl alcohol (or electronics flux remover) and a brush.\u003cbr\u003e\u003cbr\u003enspect all solder connections carefully, using a magnifying glass, to make sure there are no solder bridges or cold solder joints. Use a multimeter in ohms scale to check for short circuits. As a minimum, you should verify that the V+ DC are not shorted to ground, or to each other, and that the output pad isn't shorted to ground. Correct any mistakes before proceeding to the next phase.\u003c\/p\u003e\n\u003c\/div\u003e\u003cdiv class=\"detailmodule_text-image\"\u003e\n\u003cp\u003e\u003cspan style=\"background-color:rgb(255, 255, 255);color:rgb(0, 0, 0);font-size:20px;font-family:OpenSans\"\u003eParts list\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003c\/div\u003e\u003cdiv class=\"detailmodule_text-image\"\u003e\n\u003cp style=\"font-family:OpenSans;font-size:20px;font-weight:900;line-height:28px;white-space:pre-wrap;color:rgb(0, 0, 0);margin-bottom:12px\" class=\"detail-desc-decorate-title\"\u003ePics\u003c\/p\u003e\n\u003cp style=\"font-family:OpenSans;font-size:14px;font-weight:300;line-height:20px;white-space:pre-wrap;color:rgb(0, 0, 0);margin-bottom:12px\" class=\"detail-desc-decorate-content\"\u003eDIY KIT\u003c\/p\u003e\n\u003cdiv\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003cdiv class=\"detailmodule_text-image\"\u003e\n\u003cp style=\"font-family:OpenSans;font-size:20px;font-weight:900;line-height:28px;white-space:pre-wrap;color:rgb(0, 0, 0);margin-bottom:12px\" class=\"detail-desc-decorate-title\"\u003eFinished Boatd\u003c\/p\u003e\n\u003cdiv\u003e\n\n\u003c\/div\u003e\n\u003c\/div\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cdiv class=\"dropship-description-images\" style=\"margin-top:24px;display:grid;gap:16px;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0902\/5142\/7874\/files\/Se852a197d222427b84ed8d932787a528n.webp?v=1791225967\" loading=\"lazy\" style=\"display:block;width:100%;max-width:900px;height:auto;margin:0 auto;\" alt=\"\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0902\/5142\/7874\/files\/Sbaffa7b48b784dddba5fb2be64d83edan.webp?v=1791225967\" loading=\"lazy\" style=\"display:block;width:100%;max-width:900px;height:auto;margin:0 auto;\" alt=\"\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0902\/5142\/7874\/files\/S8143571f8a3b4c77a45610b02f2bd7b3q.webp?v=1791225967\" loading=\"lazy\" style=\"display:block;width:100%;max-width:900px;height:auto;margin:0 auto;\" alt=\"\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0902\/5142\/7874\/files\/Sc603d53514d74ca8a71412401329b81dR.webp?v=1791225967\" loading=\"lazy\" style=\"display:block;width:100%;max-width:900px;height:auto;margin:0 auto;\" alt=\"\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0902\/5142\/7874\/files\/S263d0cdbad874d60ae8c8535cfd06434D.webp?v=1791225967\" loading=\"lazy\" style=\"display:block;width:100%;max-width:900px;height:auto;margin:0 auto;\" alt=\"\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0902\/5142\/7874\/files\/See5116d40a3e49c1ad38733242670d8dW.webp?v=1791225968\" loading=\"lazy\" style=\"display:block;width:100%;max-width:900px;height:auto;margin:0 auto;\" alt=\"\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0902\/5142\/7874\/files\/S3cdce6c0a10b4faeb5287f7935d1f37dr.webp?v=1791225968\" loading=\"lazy\" style=\"display:block;width:100%;max-width:900px;height:auto;margin:0 auto;\" alt=\"\"\u003e\n\u003c\/div\u003e","brand":"Pin \u0026 Tumbler","offers":[{"title":"Finished Board","offer_id":67804021424162,"sku":"ALI-1005004014043334-12000027741431148","price":56.9,"currency_code":"USD","in_stock":true},{"title":"DIY KIT","offer_id":67804021456930,"sku":"ALI-1005004014043334-12000027741431147","price":47.08,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0902\/5142\/7874\/files\/Se852a197d222427b84ed8d932787a528n.webp?v=1791225967","url":"https:\/\/pinandtumblr.com\/products\/mofi-t-phonum-2-mm-mc-phono-amplofier-riaa-diy-kit","provider":"Pin and Tumbler","version":"1.0","type":"link"}