LM3886+NE5532 68W*2 Dual-channel 2.0 Pure DC Finished Power Amplifier Board

Description

LM3886+NE5532 68W*2 dual-channel 2.0 Pure DC Finished Power Amplifier Board
Note: This price includes: 1*power amplifier  +
heatsink
+ 2pcs Novartis 10000UF50V FOR AUDIO main filter capacitor
Power supply voltage:
It is recommended to have dual transformers around 24V-0-24V.
The maximum voltage should not exceed AC dual 26V, and the minimum should not be less than AC dual 16V.
Transformer power supply with power not less than 150W
1. Dynamic feedback method (both voltage and current feedback), made some improvements on the basis of Wu Gang's circuit. Inherit the advantages of Wu Gang's circuit. d Dynamic feedback method, the feedback network also includes the speaker, which is a kind of energy The super feedback circuit that effectively offsets the speaker distortion makes the power amplifier lower distortion, higher signal noise, better resolution, warm and elastic sound, and has a strong appeal.
2. Pure DC amplifier structure, HIFI enthusiasts know that the coupling capacitor is too small, and the low-frequency signal cannot pass, resulting in poor bass. If the coupling capacitor is selected too large, the charging and discharging time of the capacitor will be longer, which will slow the passage of high-frequency signals and make the medium and high-frequency transient response worse. Many friends use a large capacitor in parallel with a small capacitor, but no matter how you adjust it None of them can perfectly solve the problem of high and low frequency connection, and the output signal is nondescript, making the sense of hearing particularly unnatural. This power amplifier is a DC amplifier with a frequency response of 0-100KHZ. In order to ensure the separation, each channel uses a high-gain single op amp to clamp the DC level at the output. Completely abandon the input and output coupling capacitors and feedback electrolysis that have a great impact on the sound quality, making the low-frequency dive deeper and the high-frequency response fast. (DC servo op amp, no need to consider replacement, no IC holder, direct welding is more stable)
3. UPC1237 and Omron relay form the speaker protection circuit. Although the LM3886 has integrated very complete protection functions, the premise of these protection functions is that when the LM3886 is intact, considering the different levels of DIY friends, anyone on the way Anything can happen, so it is still necessary to add a protection system, even if the 3886 chip is accidentally damaged during DIY, it can ensure the safety of your high-end speaker unit!
4. A set of XRL balanced input interface is designed. In addition to the ordinary RCA input, a set of XRL balanced input interface is designed. Balanced audio technology is nothing new. It was born as early as the early days of the telephone. Its application allows voice information to be transmitted over long distances to maintain a very low noise level. This is also the reason why balanced signal transmission is still being used in high-end audio. It allows us to resist noise and Distorted way to transmit audio signal.
5.PCB adopts FR-4 double-sided immersion gold process,
For better performance, the circuit has been optimized many times, the component layout is neat and reasonable, and the signal is accurately grounded.
Current version (QIUSHUO PA3886-2.0.6)
(PCB size: length 170mm, width 83mm, heat sink size: length 170mm, width 45mm, height 61mm)
Package Included:
1pcs LM3886+NE5532 68W*2 dual-channel 2.0 Pure DC Finished Power Amplifier Board
Payment Details
We only accept Paypal Payment.
We will send the item to you as soon as you won and paid.
Delivery Details
We provide standard shipping to international via China Post airmail or Hongkong Post airmail with tracking number.Email us if not receive items.
We only ship to the approved address given in Paypal Payment.Please make sure payment address in Paypal is correct.Any non-received items caused by invalid address registered on Paypal are not in our full refund or replacement policy.
Returns and Replacements
We accept returns and replacements within 30 days from the day the cutomer receive the products.Please make first contact within 30 days from receiving the order.Products should be returned in original condition.
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