Mono Balanced to Unbalanced Audio Converter Pre-amplifier ULTRA LOW NOISE PCB

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Product Description
100% Brand New and High Quality
Balanced XLR to single-ended RCA output dual op amp line finished board: line by the famous British amplifier designer Douglas Self design, line design unique, making the circuit with ultra-low distortion of the excellent performance, the noise is very low.
T
he
Color of the
New PCB
may
change
Circuit principle:
The distortion and noise of this line is much lower than the average circuit, so the circuit looks less simple and slightly complicated, the purpose is low distortion and low noise. In general, the balance signal should be converted to unbalanced (single-ended) output signal, you can use 1/2 of the NE5532 plus 4x10K resistance, according to the schematic diagram IC2A can be achieved. At this point in the figure R5 ~ R8 are taken 10K, a pair of balanced signals from the left side of the R5 R6 input, from the right end of R9 can be single-ended output signal. This differential amplifier circuit is fairly simple. Output noise is also low, roughly up to -104dBu (0dBu = 775mV), but still feel the noise is large, for this purpose using the so-called double balance level, that is, by the IC2A, IC2B composed of two differential amplification stage, they were simultaneously received The balanced input signal is then added so that the irrelevant noise is partially offset, resulting in a 3dB reduction in noise while also improving the circuit common mode rejection ratio (CMRR).
Further improvements are also in the IC2A, IC2B before the increase of a voltage follower IC1A, IC1B. This is not only improve the input impedance, but also to IC2A, IC2B 8 resistance R5, R6, R7, R8, R13, R14, R15, R16 resistance from the original 10K down to 820ohm, greatly reducing the thermal noise resistance, Ultimately, the level of noise reduced by -112dBu, than the traditional single differential circuit to improve the 8dB as much.
Note: One board is a single-channel, two pieces board composition of stereo output.
Friendly reminder:
use the time to pay special attention to the supply voltage should not exceed ±18V.
Three lines balanced XLR signals not take the wrong. NE5532 manifold circuit board and some electrolysis is used to disassemble genuine. Some capacitors used brands, models, specifications will be slightly different.
Exquisite double-sided FR4 fiberglass boards, high-quality PCB board (77 X 37mm), thickness 2mm arc traces a little ground. Continued
±5V~±15V
stable voltage to work.
Work mode:
The circuit board used in the CD player, XLR balanced output signal via line converted to a single-ended RCA outputs to the next stage (pre-amp / amplifier).
The board can put a better op amp
, such as AD826, AD827, OPA2134, OPA2604, OPA2111 op amps and other high,
the effect will be extraordinary.
Package Included:
1x
Balanced to unbalanced XLR to RCA pre-amplifier
Bare PCB
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Delivery details
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Delivery details
● Items will be shipped within 1~2 business day after payment received.
● Items are shipped from China by Airmail,
delivery time depends on destination and other factors, normally delivery to USA need
7~18 days
,
reach most of the countries within
10~35 business days
. But to Brazil or Africa, it need
35~65days
.
Terms of sales
● All the items will be tested before shipping. Buy them with the confidence!
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● For defect or wrong items , please you contact us, We will fully refund or send you a new replacement.
● If you not satisfied with our items, pease contact within 3 days, we will fully refund after get your returned goods.
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● If have any question, Please contact us by ebay message before leaving neutral, negative feedback or open any dispute, we will reply within 24 hours, ensure that help you solve the problem, make you satisfied.
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Balamced XLR to Single Ended Unbalanced Output op-amp Bare PCB