Six-channel remote control the number of NC-speed volume control potentiometer 256 100K

Six-channel remote control the number of NC-speed volume control potentiometer 256 100K advantages: 1, using SCM control. 2, the control precision 0.5dB, can be used as a standard sound engineer. 3, full remote control. 4, with four LED digital display, volume gear at a glance. 5, with news source switching circuit, the switching function in the process of fade, no impact sound switch. 6, with a total power control circuit. 7, the use of resistors and gold-plated relay contacts to control the volume, no transistors, tubes, IC brings coloration, can be used with any circuits. 8, constant input impedance, input impedance of any gear are equal to the nominal impedance. 9, the imbalance between channels with the general resistance rings can do the tracking error (2,4,6,8) channel is ± 0.005dB. 10, with a mute function. 11. Do not adjust properly installed can work. Parameters: Nominal Impedance: Nominal impedance: common for 100 K. (10 K, 50 K, 100 K, 250 K, 500K optional bulk orders required). Potentiometer control range: from 0dB to -127.5dB 256 files potentiometer control accuracy: 0.5dB / file potentiometer attenuation amount display: four 0.56-inch LED digital tube; (red, green, blue optional) input source Switching Control: CD, DVD, TAPE, AUX four source input switching display: 4 bulb; (red, green, blue optional) the entire audio or amplifier power control: 10A relay; waiting: red bulb; work : Green light emitting tube control: 1, infrared remote control: POWER, CD, DVD, TAPE, AUX, VOL +, VOL-, MUTE 2,6 touch of a button hand control: MUTE, S +, S-, VOL +, VOL -, POWER 3,2 pulse potentiometer: VOL + / -; SOURCE + / - in Hi-Fi amplifier and pre-production or production process, the volume control potentiometer is a very important part, because it is used in the main signal channel, the signal current is then directly through it. Secondly, in all the parts, only it is the most frequent element of rotation, rotating frequently prone to wear and tear, carbon will lead to poor contact wear resulting noise, a different degree of wear of each channel, left and right channels are not prone Balanced causing movement and lead to a stereo sound image positioning allowed, let alone the current market the sale of mechanical potentiometers difficult to find the quality of clearance. In addition, two-channel resistance is symmetrical, the rotation of the whole trip is to keep track (that is, each through an angle and then measuring the two potentiometers jib either end of the resistance are the same). To this end, a number of high-end audio band switch are used (usually 24 stalls), then use a series resistor, which controlled the amount of about 2 ~ 4dB of each file, this solves the problem and balanced two-channel tracking, but mechanical wear and tear caused by friction contact and the principal contradiction, not to mention ordinary band switch contacts are break before make before, on the main channel signal will produce \ "; clicks \"; the noise, for Amplifier output power is relatively large impact on the loudspeaker. Switzerland has a gilded band switch, is specifically designed for the volume potentiometer, and when the rotary contacts can be done after the first off, to some extent, to avoid the \ "; clicks \"; the impact of sound, but there are still shortcomings : ① expensive, two-channel switch will light band to 1,000 yuan, quadraphonic about 2,000 yuan. ② only 24 stalls, thick tranches. ③ not remote control. ④ source switching is not possible fade process. ⑤ still worn with a long and poor contact phenomenon. In response to these problems, the author designed a multi-channel potentiometer for use on high-end audio, the main properties are as follows: ⑴ Japan Matsushita miniature relay gold seal as the contact point, this relay for industrial control and even on the plane had no problems reliable contact. ⑵ use MCU control, control in the form of a binary type, a few resistors can be constituted, control accuracy of 0.5dB, the control range from 0dB to -128dB total of 256 stalls, imbalance between channels depends on the resistance, with the general Rings resistance they can do the tracking error of four channels is ± 0.005dB. ⑶ full remote control. ⑷ with four LED digital display (with blue LED tube to choose from), the volume of stalls at a glance. ⑸ with news source switching circuit, in the process of information sources handover can do fade. ⑹ volume adjustment process because of resistance remain in contact state and never have \ "; clicks \"; sound. ⑺ can be used with the pulse potentiometer or touch of a button, easy to install anywhere in the panel. ⑻ low cost. ⑼ this quad potentiometer input impedance throughout the adjustment process (from 0dB to -128dB) are kept constant (equal to the nominal value of the potentiometer), and the market potential of other numerical input impedance than the ups and downs, called constant input impedance. Constant input impedance advantage is a serious distortion does not affect the coupling between the front stage, thereby avoiding impedance changes brought about by the frequency response curve, some numerical potentiometer input impedance can vary from a few dozen in Europe adjust the volume during to 100K, it will affect the output of the frequency response characteristics of the pre-information sources. ⑽ available upon customer request to join multi-point accurate loudness control circuit. ⑾ with a mute function. ⑿ thoroughfare home automation system can be achieved with different rooms or different floors control volume, while listening room to answer the phone when the volume is automatically reduced from the background music. When using the thoroughfare's future system does not replace the volume potentiometer, avoid duplication of investment. Circuit Analysis: How it works on this potentiometer see Fig. 1, seen from the figure, it is by multiple sets of attenuation circuit. Can be seen from the figure, the main signal path, R11, R21, R31 series is always, no matter the entire work process is not always "off", therefore, the signal path is working reliably. Taking into account the analysis of convenience, the circuit shown only three attenuation circuits. R11 and R12 constitute the first stage attenuator circuit Z1, the R21 and R22 constitute Z2. From the amount of attenuation of each attenuation circuit stage output obtained Z1 = R12 / (R11 + R12), Z2 = R22 / (R21 + R22) ..., is converted into the corresponding amount of attenuation dB readings should be logZ1 (dB) = 20logR12 / (R11 + R12), to said tertiary circuit, for example, when a certain level attenuation circuit does not work, as long as the K11 closed, K12 is lost, the amount of attenuation Z1 makes zero. Set up three attenuation were Z`1, Z`2, Z`3, the control switch will get the following closing eight combinations, = 1dB = 2dB = 4dB this is exactly the number of combinations 2 = 8 kinds. Table 1 clearly 8 group faders 2 = 256 kinds can be obtained which is equivalent to 256 steps stepping potentiometer, if the smallest file is 0.5dB, then 256 kinds can be done 127.5dB attenuation amount of attenuation. This article describes the potentiometer is based on this principle designed. Since 8 group attenuator design is relatively complex, and in order to ensure that all the results can still do a combination of constant input impedance calculation it is more trouble. Therefore, the author devotes VFP database programming language designed to write a resistance attenuator for each program, simply enter attenuator series, the desired input impedance, 8 groups will immediately calculate the resistance (16 species) of the value, Very convenient. This software only needs to contact a friend to free access to the thoroughfare. To put this modern means of potentiometer and automatic and remote control link, it is considered to use MCU control, instead of using the relay contacts switch in Figure 1. Combined with infrared remote control mode, for the value or amount of attenuation potentiometer can be seen, in particular the use of three and a half LED digital displays decibels attenuation. IC1 can figure IC4 receives instructions via infrared transmitter through after shaping into the IC1, IC1 solution in the corresponding directive, by J3 to 5 to control the opening and closing associated relay by the attenuator switch contact resistance aim to control the volume. In addition, through the IC2 decoded to drive the four-segment LED display pen corresponding attenuation in decibels, go through the IC3 decoding of four LED digital tube-bit drivers. The potentiometer addition to the remote control, but also for manual control, manual control is mainly through buttons on the panel. Transformer T1 is guarding this figure transformer, taking into account the remote control switch host power transformer, the transformer can not be present with the use of the main power transformer, and use a separate transformer. Figure 6 is a power supply circuit, and there is no place in particular to explain, but it requires the transformer must not be shared with the analog part of the original machine, and electrical shielding of the transformer should also pay attention to before conversion does not affect the original front or amplifier signal to noise than prevail. When the plates butt, socket can not be wrong, pay attention to distinguish each terminal, figure T2 transformer control transformer, independent selection of the best. So as not to cause interference to the preamplifier. J3 220 VAC outlet for the host transformers for switching by remote control or manually controlled by a relay VD4. On the control circuit shown in Figure 5, Figure 5 can be divided into three parts: Part potentiometer, control section, the source switching section. Wherein part by the potentiometer 16 and the corresponding relay group of 8 resistors, each resistor attenuator instead of a set, the total resistance values ??are 100K, 50K and 10K are three different resistors have different resistance values, the resistance also depending on the step length, depending on the series, so the actual value not shown in FIG. As the picture shows fully balanced, so a total of four channels, four channels are exactly the same. When the user needs two channels, you can cancel the half. Metal film resistors rings should choose better. Small relay must be small in size, good sealing, access to reliable gold-plated contacts as well, this figure using Panasonic products. Installation use: Considering that most fans have hands hobby, this circuit layout in the part surface when specially arranged for the installation of a clear figure number and component values, generally based on the correct welding circuit debugging can be completed successfully. It should be noted that component parts must be precisely potentiometer, the error is greater than 1% of the expected parameters will not be achieved, then some of the advantages and strengths of the circuit will not be established. As the circuit section except potentiometer, 尚集成 the source switching, remote control switch, mute, waiting for planes and other functions, and therefore is a package solution or a high-end pre-merger machine program, high-level main circuit (front set, amplifier) ??plus the appreciation of the circuit immediately as an automated, modern sound products, in addition, in the source switching, the microcontroller program includes a fade process: the conversion source → volume descending → Volume zero → switching signal source → volume steeled reply to attenuation level before switching. This feature will be more humane. As the circuit is basically no analog circuit, so this problem does not exist debugging. The figure chosen to relay the most critical element, it requires small size, high reliability. How it works: Set 8 attenuators are based on the binary principle, followed by 0.5dB, 1dB, 2dB, 8dB, 16dB, 32dB, 64dB, if these faders mix and match, you can get from 0.5 ~ + 128dB continuous Each steps of 0.5dB attenuators, 2 = 256, so the total of 256 steps. If you do not 80dB attenuation later, the eighth gear is not designed to 64dB, and 16dB can be only designed for. For 0.5dB precision adjustment allows the volume adjustment process is very smooth, did not notice the feeling of jumping. In the design process, each attenuator stage input impedance are equal to the nominal value, e.g., if the nominal value of the potentiometer 4 × 100K, the attenuator input impedance of each stage should be maintained 100K, regardless of the use of the number of class, the total input impedance should remain 100K, so as to achieve a constant input impedance of constant input impedance to match the previous stage is very important, change the input impedance of the input frequency shift will result in deterioration of the line calculated to that end process is more complex, for which, as a user design, I use VFP calculated for each group wrote a resistance attenuator program, simply enter each stage of the use of step (for example 0.5dB), the total number of stages, potentiometer required nominal value. The program automatically calculates the list stall resistance required due to the resistance of the Yu (strictly speaking, should be half the resistance) is kept connected in series, so the relay switching process is definitely not produces a "click" sound, which is all the other bands or other forms of relay switch potentiometer can not be compared. Because the line is more complex, generally single printing plate easy cloth good, so in addition to the power board, the all with double printing plate. Feeling: I have a full balance of bile before class, before the use of ordinary band switch, the Swiss gold-plated band switch, ALPS potentiometer famous are not satisfied, especially with ALPS, since the four channels can not be accurately tracked, so adjust the volume when Pan will move in favor of the potentiometer, the feeling pan positioning accuracy, however adjust the volume, the sound field is always the same. Digital Potentiometer Quote: 100K finished board: 1, a full set of finished products containing remote control, display panels, control panels, power and total power control panel (which 4/6/8 1/2/3 block channels plus auxiliary control panel) two-channel, four-channel, six-channel, eight-channel. 2. It may be a blue LED digital plus 30 yuan. 3. A full-volume printing plates, finished remote control, microcontroller IC and IR receiver prices are negotiable. Address: 6-8 Lu Jing Road, Guangzhou City, the first floor (510091) ?????????????????? Tel:? 020-83592575 18929579698 QQ:? 806620209