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{"api":"mtop...","data":{"":[{"name":"Color Classification","value":"Red, Blue, green"}],"":"","":{"":[],"pages":["\u003e shock launch! Front-level electronic Three-frequency board with direct adjustable frequency division point! \u003c/txt\u003e "," \u003e which frequency division point do you want? Just adjust it by hand! \u003c/txt\u003e "," \u003e,\u003c/txt\u003e "," \u003e can \u003c/txt\u003e ","\\u003e provides some information about the finished machine for your reference, including the seller's link address of all aluminum alloy chassis, the opening size of the front and rear panels, the opening size of the bottom plate, technical information on the procurement and manufacture of assembly parts. \u003c/txt\u003e "," \u003e copy this link to browse the introduction of previous complete machines. For more information, see \u003c/txt\u003e ","\\u003e in the second half of this page, some information about the finished machine will be displayed. Friends who need information will leave their email address to you after taking the board,\u003c/txt\u003e "," \u003e no information will be sent if you do not order,\u003c/txt\u003e "," \u003e please understand. \u003c/txt\u003e "," \u003e information includes the following documents for reference:\u003c/txt\u003e ","\u003cimg size = 835 x110\u003e // img. Awesome_!! . jpg\u003c/img\u003e "," \u003e product introduction:\u003c/txt\u003e ","\\u003e this is a recent fever work of Mr. linquetz, an internationally famous sound master, which has become popular in European and American countries, the biggest highlight is that you can change the frequency division of the three-frequency board without changing components, which brings great convenience to friends who want to change but are difficult to grasp the frequency division point of their speakers. It can easily adjust the frequency division of the board output. By listening carefully and constantly changing the frequency division, you can find the frequency division point that you are satisfied, make your sound system play the best effect incisively and vividly. \u003c/txt\u003e "," \u003e a digital multimeter, plus simple computing (can provide you with computing tools and software), just adjust the resistance of potentiometer to the calculated value, accurate to HZ. \u003c/txt\u003e "," \u003e the introduction to this frequency division board seems cumbersome, but it is actually very simple, but it is still not recommended for pure music enthusiasts who do not have any electronic Foundation, because they may connect the most basic frequency calculation formula \u003c/txt\u003e "," \\= 1/(2*3.14 * R * C)\u003c/txt\u003e "," \u003e does not know how to master. This frequency division board is equipped with detailed debugging instructions for your reference. \u003c/txt\u003e "," \u003e our famous linquitz. The Ruili filter circuit can be made through \u003c/txt\u003e "," \u003e, and this adjustable three-frequency board is designed by a master, the former has been popular for 40 years. This excellent circuit aims to solve the problems of friends around the world. You don't have to question the circuit principle. It comes from master linquitz and is excellent! Practical! You will be very satisfied! \u003c/txt\u003e "," \u003e this circuit uses \u003c/txt\u003e "," \u003e state variable filter \u003c/txt\u003e ","\\u003e achieves frequency selection, rigorous design, strong theory, simple circuit, only need to change the potentiometer resistance can change the frequency division in a large range, most applications can be applicable. \u003c/txt\u003e" , "\\u003e about \u003c/txt\u003e","\u003e state variable filter technical information, you can Baidu, there are many introductions. \u003c/txt\u003e "," \u003e combined with the following figure to understand the structural characteristics of the frequency division board:\u003c/txt\u003e "," \u003e★The parallel power supply of Class A with excellent power supply characteristics is adopted to supply power to the board. The music details are more delicate and authentic, and the noise is almost unaudible;\u003c/txt\u003e "," \u003e★Choose the King of the operational amplifier imported from TI, you can change it to other dual operational amplifier with more fever \u003c/txt\u003e "," \u003e★WIMA capacitor, Thomson capacitor, Philips capacitor, Panasonic capacitor, Nikon capacitor, etc. are selected for signal coupling frequency division decoupling \u003c/txt\u003e "," \u003e★Brand BOCHEN 3296W multi-ring precision potentiometer, adjust up to 25 turns, so the resistance value can be more delicate to distinguish \u003c/txt\u003e "," \u003e★The layout is clear and clear, and the frequency division size can be adjusted perfectly without mastering the circuit \u003c/txt\u003e "," \u003e this product is recommended to use 15-30W ring or R-type transformer, AC output double 15V is OK, this board is not equipped with transformer. \u003c/txt\u003e "," \u003e setting of frequency division point:\u003c/txt\u003e "," \u003e under \u003e \u003c/txt\u003e ","\\u003e yellow table "common frequency division point range reference" \u003c/txt\u003e "," \u003e provides you with an alternative frequency division point range, you can select the frequency division range of two serial numbers according to your own speaker and personal preference or directly inform the seller that the seller will make the frequency division according to your requirements. If you do not specify, the seller will deliver the goods according to the default frequency division point. The Default Frequency Division point serial number is serial number 7 and serial number 16, that is, the low frequency division point can be adjusted between 105-1064Hz and the high frequency point can be adjusted between 1054-10639Hz. Please note. \u003c/txt\u003e ","\\u003e main technical parameters:\u003c/txt\u003e ","\\, filter type:\u003c/txt\u003e "," \\u003e state variable filter \u003c/txt\u003e "," \, frequency division point: freely adjustable \u003c/txt\u003e ","\\, \u003c/txt\u003e "," \u003e attenuation slope:-12dB/Oct\u003c/txt\u003e "," \, plate structure: stereo six-channel output, the output amplitude of total output (Volume), treble, alto and bass can be adjusted. \u003c/txt\u003e ","\\, operational amplifier chip:\u003c/txt\u003e "imported from TI company,"\\, potentiometer type: 09 type sealed potentiometer +3296 precision multi-ring potentiometer \u003c/txt\u003e ","\\, board shape size: 178 * 100mm\u003c/txt\u003e ","\\, power supply voltage and current \u003c/txt\u003e "," \u003e: AC Double 15V to double 16V (recommended double 15V AC voltage, too high will only cause useless heat loss), the DC current of the board is not more than 64mA (when the voltage is plus or minus 15V, that is, the current of each operational amplifier is 8mA)\u003c/txt\u003e ","\\, plug-in parts:\u003c/txt\u003e ","\\Lotus socket and wiring terminal are optional (RCA Lotus holder input and output is sent by default when not specified)\u003c/txt\u003e "," \u003e our store also has the same principle as this frequency division board \u003c/txt\u003e "," \u003e, if your current work Put, audio hardware does not meet the requirements for three-frequency, please \u003c/txt\u003e "," \u003e this product. \u003c/txt\u003e","\u003cimg size=800x600\u003e//img.alicdn.com//i3 //!! . jpg\u003c/img\u003e "," \u003e for demonstration only, the frequency division board does not contain toroidal transformer \u003c/txt\u003e "," u003cimg size = 2000 x1500\u003e // img. Awesome//!! . jpg\u003c/img\u003e "," \u003e the following figure shows the active servo power supply board controlled by LF353 operational amplifier. Only the power supply mode is different, other boards with Class A power supply are exactly the same. \u003c/txt\u003e "," \u003e (also available with Lotus socket and wiring terminal)\u003c/txt\u003e "," u003cimg size = 800 x600\u003e // img. Awesome//!! . jpg\u003c/img\u003e "," \u003e how to adjust the frequency division point? \u003c/txt\u003e "," \u003e there are 2 rectangular white frame lines on the board, and 4 small rectangular frames in each white frame line, as shown in the following figure. There is a capacitor in each wire frame. This capacitor is the frequency division Capacitor. Before shipment, use 0.3% digital bridge to test the parameters and mark them at the end of the page of your instruction manual for calculation. The 3296W potentiometer with 8 copper handles on the board is responsible for adjusting the first frequency division point and the second frequency division point of the left and right channels respectively. If the frequency division point is changed, First, calculate the resistance value required by the new frequency division point (provided by the store through calculation software), and only need to adjust the resistance value of 3296W Multi-turn potentiometer (use digital multimeter to measure the measuring point on the board, preferably 1/4 digital table) you can accurately adjust it to the desired frequency. Note that when adjusting the potentiometer, disconnect the power supply and signal input to avoid affecting the accuracy. For more information, see the description. \u003c/txt\u003e "," \u003e The following is the effect diagram of PCA lotus base input and output board: for the input and output board of the 2-wire copper terminal, see the figure above \u003c/txt\u003e "," u003cimg size = 600 x800\u003e // img. Awesome//!! . jpg\u003c/img\u003e "," \u003e friends may want to ask, why not use double potentiometer or 4 potentiometer, isn't this more convenient? \u003c/txt\u003e "," \u003e this is because the resistance error of double potentiometer and multi potentiometer is too large, and the consistency is very bad! The allowable error of potentiometer resistance on the market is 20%. Even if the potentiometer with an accuracy of 10% is high, the resistance range of 50K is between 45K and 55K, The resistance value is so, and the consistency is not guaranteed, and the synchronous adjustment of frequency cannot be realized. Therefore, if we want to get accurate frequency division point output, the multi-joint potentiometer is not competent. In addition, the multi-joint potentiometer does not have multi-ring design, with a slight rotation, the resistance changes greatly, and it cannot be used to require accurate resistance. \u003c/txt\u003e "," \u003e multi-turn 3296W potentiometer can solve this problem very well. The number of turns that can rotate 25 turns can adjust the resistance value to very accurate, precise adjustment can make the frequency division point accurate to 1Hz, even the burning friends with strict requirements can meet it. Although the adjustment is a little troublesome, the accuracy is guaranteed. This trouble is worth it for our friends. \u003c/txt\u003e "," \u003e the following table shows the range of commonly used frequency division points. For the three-frequency division, there must be two frequency division points, namely the low frequency division point (the first frequency division point) and high frequency division point (second frequency division point), the frequency range given by each serial number is relatively wide, you can choose what you need within these frequencies, for example, the minimum lower limit of your first frequency division point must be between 80-700Hz, then select the number 13 to tell the seller, Your second frequency division point should be 700-4000Hz, then the serial number 6 and serial number 7 can be met. Select one and tell the seller that the seller will use the capacitance value in this serial number to make it for you according to your requirements. \u003c/txt\u003e "," \u003e if you feel dissatisfied with the frequency range after purchase, you only need to replace the capacitor with other new values (the reserved position on the board can be used to connect one capacitor to the original capacitor). There are 8 frequency division capacitors on the frequency division board, if only one frequency division point is changed, only four capacitance values need to be changed. \u003c/txt\u003e","\u003cimg size=661x684\u003e//img.alicdn.com//i1//l _!! . jpg\u003c/img\u003e "," \u003e computing software introduction:\u003c/txt\u003e "," \u003e actually, the calculation formula is the commonly used formula for calculating the resistance frequency,\u003c/txt\u003e "," \= 1/(2*3.14 * R * C\u003c/txt\u003e ","\\u003e, but this calculation is very inconvenient. Use software "\u003c/txt\u003e","\u003e circuit expert \u003c/txt\u003e","\\u003e" This tool is very convenient, but this small software is running on it, which is no problem. We all have it and can turn on computing at any time. Besides, there are many computing functions inside, for example, there are more than 20 kinds of "resistor color ring calculator" and so on, which are very suitable for electronic enthusiasts. You can find it in "360 assistant" or open this web page http://pan.baidu.com/s/1\u003c/txt\u003e "," \u003e can be installed on it to run. \u003c/txt\u003e "," \u003e The following is the interface on which the software runs. Open the "filter" calculation function:\u003c/txt\u003e "," u003cimg size = 1226 x768\u003e // img. Awesome//!! . jpg\u003c/img\u003e "," \u003e enter any two of the three items to obtain the value of the third item. In the figure, R = 22.3K, C = 0.01UF frequency is 71.37Hz \u003c/txt\u003e "," u003cimg size = 2000 x1500\u003e // img. Awesome//!! . jpg\u003c/img\u003e "," \u003e the adjustable range of resistance in the frequency division board is generally 3.3K-23. Between 3K (the fixed resistance is 3.3k potentiometer is 20K), changing the capacitance, the frequency can be changed in a large range, so it can fully adapt to the demand of frequency division. \u003c/txt\u003e","\u003cimg size=2000x1500\u003e//img.alicdn.com//i1 //!! . jpg\u003c/img\u003e ","\\u003e the following pictures are the previous complete machine pictures of our store for reference:\u003c/txt\u003e ","\\u003e friends who need to install the machine, please send the following information to your email address if necessary after taking the board. Do not provide too much support in production, please understand! \u003c/txt\u003e","\u003cimg size=835x110\u003e//img.alicdn.com//i1//sS9 _!! .jpg\u003c/img\u003e","\u003cimg size=800x600\u003e//img.alicdn.com//i3 //!! . jpg\u003c/img\u003e "," \u003e internal installation diagram:\u003c/txt\u003e "," \u003e rear panel of the whole machine:\u003c/txt\u003e "]," ":[] >>," ret ":[":: call succeeded "]," v ":" 6.0 "}