{"product_id":"classic-single-ended-otl-circuit-stk-beautiful-sound-thick-film-stk437-power-amplifier-board-diy-finished-product-board-strong-taste-sweet-voice","title":"STK437 amplifier board – classic single-ended OTL circuit, STK sweet-sounding thick-film, DIY finished board","description":"\u003cul style=\"box-sizing: border-box;margin-bottom: 8.0px;margin-top: 0.0px;padding-left: 20.0px;color: #222222;font-size: 16.0px;font-style: normal;font-weight: 400;letter-spacing: normal;orphans: 2;text-align: start;text-indent: 0.0px;text-transform: none;widows: 2;word-spacing: 0.0px;white-space: normal;background-color: #ffffff;\"\u003e\n\t\u003cli style=\"box-sizing: border-box;font-weight: 400;list-style-type: disc;padding-left: 4.0px;\"\u003e\n\u003cstrong style=\"box-sizing: border-box;font-weight: 600;\"\u003epower output\u003c\/strong\u003eSTK437 has a channel output power of 10W (TDH = 0.2%) at a typical operating voltage of 33V, which has a certain power output capability and can meet some audio playback scenarios that do not require particularly high power\u003cspan\u003e \u003c\/span\u003e.\u003c\/li\u003e\n\t\u003cli style=\"box-sizing: border-box;font-weight: 400;list-style-type: disc;margin-top: 8.0px;padding-left: 4.0px;\"\u003e\n\u003cstrong style=\"box-sizing: border-box;font-weight: 600;\"\u003esound quality characteristics\u003c\/strong\u003e:\n\t\u003cul style=\"box-sizing: border-box;margin-bottom: 0.0px;margin-top: 8.0px;padding-left: 20.0px;color: initial;\"\u003e\n\t\t\u003cli style=\"box-sizing: border-box;font-weight: 400;color: initial;list-style-type: circle;padding-left: 4.0px;\"\u003e\n\u003cstrong style=\"box-sizing: border-box;font-weight: 600;\"\u003eLow distortion\u003c\/strong\u003eTotal harmonic distortion (THD) is low, like only 0.2% under the above typical conditions, which means that it can accurately restore the audio signal, play the sound is relatively pure, less obvious distortion phenomenon, for the pursuit of high fidelity sound quality is an important indicator for users.\u003c\/li\u003e\n\t\t\u003cli style=\"box-sizing: border-box;font-weight: 400;color: initial;list-style-type: circle;margin-top: 8.0px;padding-left: 4.0px;\"\u003e\n\u003cstrong style=\"box-sizing: border-box;font-weight: 600;\"\u003eSound reduction is better\u003c\/strong\u003eIt can amplify the audio signal more accurately, perform more balanced in terms of frequency response, and present the various frequency components of the audio signal relatively completely, so that the played sound is closer to the original audio signal in terms of timbre, tone, etc., giving people a more realistic auditory experience.\u003cspan style=\"font-size: 16.0px;font-style: normal;font-weight: 400;letter-spacing: normal;orphans: 2;text-align: left;text-indent: 0.0px;text-transform: none;widows: 2;word-spacing: 0.0px;white-space: normal;background-color: #ffffff;display: inline;float: none;\"\u003e:\u003c\/span\u003e\n\u003c\/li\u003e\n\t\t\u003cli style=\"box-sizing: border-box;font-weight: 400;color: initial;list-style-type: circle;padding-left: 4.0px;\"\u003e\n\u003cstrong style=\"box-sizing: border-box;font-weight: 600;\"\u003eHigh audio transparency and level of detail\u003c\/strong\u003eSince the OTL circuit does not use a protection circuit, the signal transmission path is more concise, providing a purer audio signal, making the STK437 generally have a higher audio transparency and level of detail, which can more clearly show subtle changes in music\u003cspan\u003e \u003c\/span\u003e.\u003c\/li\u003e\n\t\t\u003cli style=\"box-sizing: border-box;font-weight: 400;color: initial;list-style-type: circle;margin-top: 8.0px;padding-left: 4.0px;\"\u003e\n\u003cstrong style=\"box-sizing: border-box;font-weight: 600;\"\u003eGood low-frequency control and dynamic response\u003c\/strong\u003eThe key goal of the OTL circuit design is to make the output impedance as low as possible to match the impedance of the loudspeaker. This way, the audio signal can be better transmitted to the loudspeaker, and the STK437 can provide better low-frequency control and dynamic response, making the bass sound fuller and more powerful. It can also cope better when playing large dynamic music\u003cspan\u003e \u003c\/span\u003e\n\u003c\/li\u003e\n\t\t\u003cli style=\"box-sizing: border-box;font-weight: 400;color: initial;list-style-type: circle;margin-top: 8.0px;padding-left: 4.0px;\"\u003e\n\u003cstrong style=\"box-sizing: border-box;font-weight: 600;\"\u003eBetter immersion\u003c\/strong\u003eSTK437 is usually able to provide a better immersive stage effect, that is, the audio signal is close to the speaker position, as if the music is coming directly from the speaker, rather than from behind the speaker, allowing the listener to have a more immersive feeling\u003c\/li\u003e\n\t\u003c\/ul\u003e\n\t\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003c\/p\u003e\u003cdiv\u003e\u003cimg align=\"absmiddle\" referrerpolicy=\"no-referrer\" src=\"https:\/\/img.alicdn.com\/imgextra\/i2\/88221699\/O1CN01vl2Pjz1OQBtwfHLPH_!!88221699.jpg\" style=\"max-width: 750.0px;\"\u003e\u003c\/div\u003e\n\n\u003cp\u003e\u003cspan style=\"font-size: 26.0px;\"\u003e    \u003cspan style=\"color: #ff0000;\"\u003e\u003cstrong\u003eParameter:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\t\u003cli\u003e\u003cspan style=\"font-size: 22.0px;\"\u003e\u003cspan style=\"\"\u003ePower supply voltage: AC single 23V-33V recommended 30-60W transformer\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\t\u003cli\u003e\u003cspan style=\"font-size: 22.0px;\"\u003e\u003cspan style=\"\"\u003e\u003cspan\u003eFrequency response: 15Hz-45KHz\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\t\u003cli\u003e\u003cspan style=\"font-size: 22.0px;\"\u003e\u003cspan style=\"\"\u003eInput Sensitivity: 300mV\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\t\u003cli\u003e\u003cspan style=\"font-size: 22.0px;\"\u003e\u003cspan style=\"\"\u003eInput impedance: 220K\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\t\u003cli\u003e\u003cspan style=\"font-size: 22.0px;\"\u003e\u003cspan style=\"\"\u003eMagnification: 4Ω 32 times 8Ω 33 times\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\t\u003cli\u003e\u003cspan style=\"font-size: 22.0px;\"\u003e\u003cspan style=\"\"\u003eMeasured power: 4Ω 18W x 2 8Ω 12.5W x 2\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\t\u003cli\u003e\u003cspan style=\"font-size: 22.0px;\"\u003e\u003cspan style=\"\"\u003e\u003cspan\u003eDimensions: 105 L * 63 W * 62 H mm\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\t\u003cli\u003e\u003cspan style=\"font-size: 22.0px;\"\u003eProduct Net Weight: 150g\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp style=\"box-sizing: inherit;padding: 0.0px;word-break: break-all;color: #000000;font-style: normal;font-weight: 400;letter-spacing: normal;orphans: 2;text-align: start;text-indent: 0.0px;text-transform: none;widows: 2;word-spacing: 0.0px;white-space: normal;margin: 1.12em 0.0px;font-size: 14.0px;background-color: #ffffff;\"\u003e\u003cstrong style=\"box-sizing: inherit;font-weight: bold;font-size: 20.0px;\"\u003e\u003cspan style=\"box-sizing: inherit;word-break: break-all;color: #0000ff;\"\u003e \u003c\/span\u003e\u003c\/strong\u003e \u003cstrong style=\"box-sizing: inherit;font-weight: bold;color: #000000;font-style: normal;letter-spacing: normal;orphans: 2;text-align: start;text-indent: 0.0px;text-transform: none;widows: 2;word-spacing: 0.0px;white-space: normal;font-size: 20.0px;\"\u003e\u003cspan style=\"box-sizing: inherit;word-break: break-all;color: #0000ff;\"\u003e\u003cspan style=\"box-sizing: inherit;word-break: break-all;\"\u003eDIY is very simple, no debugging required. DIY, upgrading and modifying speakers are all good choices.\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e \u003cstrong style=\"box-sizing: inherit;font-weight: bold;font-size: 20.0px;\"\u003e\u003cspan style=\"box-sizing: inherit;word-break: break-all;color: #0000ff;\"\u003eRecommended match\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp style=\"box-sizing: inherit;padding: 0.0px;word-break: break-all;color: #000000;font-style: normal;font-weight: 400;letter-spacing: normal;orphans: 2;text-align: start;text-indent: 0.0px;text-transform: none;widows: 2;word-spacing: 0.0px;white-space: normal;margin: 1.12em 0.0px;font-size: 14.0px;background-color: #ffffff;\"\u003e\u003cstrong style=\"box-sizing: inherit;font-weight: bold;font-size: 20.0px;\"\u003e\u003cspan style=\"box-sizing: inherit;word-break: break-all;color: #0000ff;\"\u003e2-5 inch small bookshelf box or unit, accessories: copper pillar nut * 4, screw * 2, three-core shielded cable * 1\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp style=\"box-sizing: inherit;padding: 0.0px;word-break: break-all;color: #000000;font-style: normal;font-weight: 400;letter-spacing: normal;orphans: 2;text-align: start;text-indent: 0.0px;text-transform: none;widows: 2;word-spacing: 0.0px;white-space: normal;margin: 1.12em 0.0px;font-size: 14.0px;background-color: #ffffff;\"\u003e\u003cstrong style=\"box-sizing: inherit;font-weight: bold;font-size: 20.0px;\"\u003e\u003cspan style=\"box-sizing: inherit;word-break: break-all;color: #0000ff;\"\u003eThe finished board is tested and shipped, non-human damage, and the warranty is 3 months.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003c\/p\u003e\u003cdiv\u003e\u003cimg align=\"absmiddle\" referrerpolicy=\"no-referrer\" src=\"https:\/\/img.alicdn.com\/imgextra\/i4\/88221699\/O1CN01zU8rxa1OQBtw4vVMJ_!!88221699.jpg\" style=\"max-width: 750.0px;\"\u003e\u003c\/div\u003e\n\n\u003cp\u003e\u003c\/p\u003e\u003cdiv\u003e\u003cimg align=\"absmiddle\" referrerpolicy=\"no-referrer\" src=\"https:\/\/img.alicdn.com\/imgextra\/i1\/88221699\/O1CN01s1kPGq1OQBtmPIaR9_!!88221699.jpg\" style=\"max-width: 750.0px;\"\u003e\u003c\/div\u003e\n\n\u003cp\u003e\u003c\/p\u003e\u003cdiv\u003e\u003cimg align=\"absmiddle\" referrerpolicy=\"no-referrer\" src=\"https:\/\/img.alicdn.com\/imgextra\/i3\/88221699\/O1CN01uQfDXI1OQBtrgJqcA_!!88221699.jpg\" style=\"max-width: 750.0px;\"\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cimg align=\"absmiddle\" referrerpolicy=\"no-referrer\" src=\"https:\/\/img.alicdn.com\/imgextra\/i1\/88221699\/O1CN01cKoxXI1OQBtv2Duh5_!!88221699.jpg\" style=\"max-width: 750.0px;\"\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cimg align=\"absmiddle\" referrerpolicy=\"no-referrer\" src=\"https:\/\/img.alicdn.com\/imgextra\/i1\/88221699\/O1CN01IU5wHL1OQBtwhKvhj_!!88221699.jpg\" style=\"max-width: 750.0px;\"\u003e\u003c\/div\u003e\n","brand":"GoMakerHive: Ignite Your Spark into a Blaze.","offers":[{"title":"Default Title","offer_id":66600740028720,"sku":null,"price":29.54,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/2367\/2112\/files\/O1CN01vl2Pjz1OQBtwfHLPH__88221699.webp?v=1777032861","url":"https:\/\/gomakerhive.com\/products\/classic-single-ended-otl-circuit-stk-beautiful-sound-thick-film-stk437-power-amplifier-board-diy-finished-product-board-strong-taste-sweet-voice","provider":"GoMakerHive: Ignite Your Spark into a Blaze.","version":"1.0","type":"link"}