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Item: 334747092934
Condition:New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is … Read moreabout the conditionNew: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is applicable). Packaging should be the same as what is found in a retail store, unless the item is handmade or was packaged by the manufacturer in non-retail packaging, such as an unprinted box or plastic bag. See the seller’s listing for full details. See all condition definitionsopens in a new window or tab
MPN:Does Not Apply
Country/Region of Manufacture:China
Type:XLR to RCA Double Amplifier Board
Amplifier Board:Amplifier Board
Unbranded/Generic:Unbranded/Generic
UPC:Does not apply
eBay XLR to RCA Balanced to Unbalanced Pre-amplifier Headphone Amp Low Distortion XLR to RCA Balanced to Unbalanced Pre-amplifier Headphone Amp Low Distortion LG139 Board Circuit principle: The distortion and noise of this circuit are much lower than ordinary circuits, so the circuit looks less simple and more complicated, and the purpose is low distortion and low noise. Generally speaking, to convert a balanced signal into an unbalanced (single-ended) output signal, you can use 1/2 NE5532 plus 4 10K resistors, which can be realized according to the IC2A connection in the figure. At this time, R5~R8 are all 10K in the figure, and a pair of balanced signals are input from the left end of R5 and R6, and a single-ended output signal can be obtained from the right end of R9. This differential amplifier circuit is quite simple. The output noise is also low, roughly reaching -104dBu (0dBu=775mV), but the noise is still large. For this reason, the so-called double-balanced stage is used, that is, two differential amplifier stages composed of IC2A and IC2B, which are simultaneously received and balanced. After the input signals are added together, the uncorrelated noise can be partially cancelled, so as to obtain a noise reduction of 3dB, and also improve the circuit common-mode rejection ratio (CMRR). A further improvement is to add a voltage follower IC1A and IC1B before IC2A and IC2B. This not only increases the input impedance, but also reduces the resistance of the 8 resistors R5, R6, R7, R8, R13, R14, R15, R16 from the original 10K to 820 ohms, which greatly reduces the thermal noise of the resistors. Finally, the noise of this stage is reduced by -112dBu, which is 8dB better than the above-mentioned traditional single difference amplifier circuit. One board is mono, and two boards form stereo. Exquisite FR4 double-sided glass fiber board, high-quality PCB board (77×37mm), board thickness 2mm, and arc wiring is grounded at one point. Imported high-quality RC components are assembled. Japan KOA 1/4W high-precision five-color ring metal film resistor, Nissan’s famous electrolytic, gold-plated IC socket (convenient to upgrade), 2 US-made NE5532 dual op amps, connect to ±5V～±15V stable voltage to work. Working mode: This circuit board is used for the balanced XLR signal output of the CD player and converted to the single-ended RCA output to the next stage (pre-stage or power amplifier) through this circuit. Input balanced signal and output unbalanced signal. It is suitable for sound system with balanced output of sound source and unbalanced input only for subsequent equipment. Especially for those who use professional equipment as their homes, the professional audio source is XLR balanced output. This board can convert your signal source to the single-ended RCA signal required by a general power amplifier. This circuit board can be replaced with a better operational amplifier, such as AD826, AD827, OPA2134, OPA2604, OPA2111 and other high-end operational amplifiers, the effect will be better. Note: When using, pay special attention to the power supply voltage not exceeding ±18V, and the three wires of the balanced XLR signal cannot be connected incorrectly. The NE5532 integrated block on the circuit board is a genuine second-hand disassembled machine. Because the components on the board are different due to different assembly batches, the brands, models, and specifications of some capacitors will be slightly different. The components and parameters on the received board shall prevail! Packing List: 1pcs Balanced to Unbalanced XLR to RCA Pre-amplifier Headphone Amp Low Distortion About PaymentAbout DeliveryAbout ReturnsAbout FeedbackContact us About Payment Please told us your special request (e.g. Colors or Size) in ebay message when you paid. Any special request cannot be accepted after 24 hours of payment, because most of orders will be processed instantly and same day dispatched. About Delivery 1, Default send by airmail, about 45-52 days can arrive most of countries, but Brazil, Africa,Ukraine and some other remote countries may be will need some more days. If you need it urgently, please contact us for adding money using a faster courier(DHL, EMS, FEDEX etc.) 2, International shipping requires complicated shipping procedures(such as both countries customs, transit sattions etc.), also will be affected by many factors, such as holidays, weather conditions etc, so if you have not received your item within 50 days, please contact us. 3, For cross-border transactions, we are not responsible for tariffs and duties. About Returns 1, We accept returns & replacements within 30 days from the day of customer receive the products, please make sure first contact within 30 days from receiving the order. Products should be returned in original condition. 2, Please don’t easily open an ebay or paypal case or return case with us, tell u what is the problem, we will solve any problems and cover your own rights. About Feedback Dear buyers, we appreciate your business, if you are satisfied with our service, please leave me a postive rate, Your recognition will make us more confident to develop business and serve you better. Our goal is to make sure you are a happy buyer and pleasant shopping with us. Please give us ebay message before leaving any 1 or 2 ratings, neutral, negative feedback or open any dispute. We understand the concerns and frustrations you might have, and will do our endeavor to resolve the issues. Please give us the opportunity to resolve any problem. thank you very much! And hope to see you soon. Contact us If you have any questions, please feel free to email our service specialists 24 Hours a Day, and we will reply you ASAP. If no response within 24 Hours, please check the spam of mail box or kindly re-send it to us. We greatly appreciate your POSITIVE feedback. Please do NOT leave negative or neutral feedback without any contact. 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