XLR to RCA Balanced to Unbalanced Pre-amplifier Headphone Amp Low Distortion

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eBay XLR to RCA Balanced to Unbalanced Pre-amplifier Headphone Amp Low Distortion Description: The circuit is designed by the famous British power amplifier designer Douglas Self. The circuit design is unique, which makes the circuit machine have excellent performance of ultra-low distortion and very low noise. Circuit principle: The distortion and noise of this circuit are much lower than those of ordinary circuits, so the circuit looks less simple and more complicated, and the goal 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 of the 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, a pair of balanced signals are input from the left end of R5 and R6 respectively, 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 it still feels noisy. 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, irrelevant noise can be partially cancelled, so as to obtain a noise reduction of 3dB, while also improving 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 values of the 8 resistors R5, R6, R7, R8, R13, R14, R15, and R16 of IC2A and IC2B 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 brand electrolytic, gold-plated IC socket (convenient to upgrade), 2 US-made NE5532 dual op amps, connected to ±5V～±15V stable voltage to work. Working mode: This circuit board is used for the balanced XLR signal output of the CD player to be converted to a single-ended RCA output to the next stage (pre-stage or power amplifier) via 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 later stage equipment. Especially for those who use professional equipment as home, 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, and the effect is immediate. Friendly reminder: When using, pay special attention to the power supply voltage not to exceed ±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. The components on the board are different due to different assembly batches, and the brands, models and specifications of some capacitors will be slightly different. The components and parameters on the received board shall prevail! Package including: 1PCS * XLR to RCA Balanced to Unbalanced Pre-amplifier Headphone Amp Low Distortion PaymentDelivery detailsTerms of salesReturnContact us Payment We accept payment by PayPal only. Payment must be received within 7 days after auctions ended. Delivery details Items will be shipped within 1-2 business days when we received payment. Shipping to USA takes about 8-15 days in normal condition,other countries takes about 15-35 days. Please verify your eBay primary shipping address. We are not responsible for any wrong or undeliverable addresses. Terms of sales All items will be checked before packing Your feedback and 5 star ratings are much appreciated. If you are unhappy with your purchase, please contact us on negative / neutral feedback or low star ratings. Return If you receive an item is damaged or defective, we will refund you or replace it with identical one. All damaged or defective items may be exchanged within 30 days. Contact us We take full responsibility if you receive wrong item or damaged item or item not as describled. If you’re not satisfied for any reason, please feel free to contact us.Just send us an eBay message.

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