{"product_id":"4b-pure-rear-class-a-power-amplifier-board-90wx2-diy-assembly-power-amplifier-board-hifi-audio-amplifier-board","title":"4B Pure Rear Class A Power Amplifier Board 90Wx2 DIY Assembly Power Amplifier Board HIFI Audio Amplifier Board","description":"\u003cdiv\u003e\u003cspan\u003e\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e  \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e Using high-quality original parts, not only The safety quality is guaranteed, the service life is long, and more importantly, it is a strong guarantee that the actual performance can reach the design goal. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePursuit Quality is our consistent aim. This board is designed with reference to the 4B circuit of Bai Shitong, the distortion is very low, the treble is clear and bright, and the bass is clear. Powerful, not loose, not sloppy. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe inter-stage coupling capacitor adopts two 47UF capacitors in series, the sound is natural and the sound field is wide \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe resistor adopts five-ring metal resistor, and the main circuit adopts five-ring metal film resistor with an accuracy of ±1%, which ensures a good signal-to-noise ratio of the whole machine. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe wiring layout of the entire circuit board is quite rigorous and reasonable, and the overall PCB wiring adopts a one-point grounding method. The power amplifier board works stably and reliably, with large output power; the sound is beautiful and round, and the sound field is wide. Strong three-dimensional sense, stable and powerful low frequency, excellent signal-to-noise ratio, wide dynamic range. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePower parameters: DC+-55V (AC: transformer 400W dual 40V, need to add rectifier board) \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePower: Class A and B 350W (Total Harmonic Distortion THD+N Less than 0.1%), DC+-55V 4 ohms, Class A 90W+90W 8 ohms \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eClass A 90W, measured under 8 ohm load \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSpeaker impedance: 4-8 ohms. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe quiescent current of the large tube is 100MA: adjust the adjustable resistor VR2 (1K) so that the voltage of A and B is 22MV, at this time the quiescent current I=22MV\/0.22R resistance is 100MA; if the customer's heat sink is large enough, it can make Increase the static current, generally 100MA-300MA sound effect is the best. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003esize: 130 x 270MM \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eMaterial: plastic \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ecolour: black \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePackage Contents: \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e2 x Audio Amplifier Board \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOnly the above package content, other products are not included. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNote: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e  \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003c\/span\u003e\u003c\/div\u003e","brand":"mickcara","offers":[{"title":"Black","offer_id":41207551426697,"sku":"02622-1","price":266.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0365\/2131\/2393\/products\/c3c1ea38a0afd70ef0f7e65df9c8246a.jpg?v=1680073341","url":"https:\/\/mickcara.com\/products\/4b-pure-rear-class-a-power-amplifier-board-90wx2-diy-assembly-power-amplifier-board-hifi-audio-amplifier-board","provider":"mickcara","version":"1.0","type":"link"}