GHXAMP LM3886 Amplifier Audio Board JRC5534DD Op-amp Full DC Servo Circuit LM317 LM337 Regulator C1237 Speaker Protection 68W*2

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Tips:if you need the Power supply.Please open this Link Dual 35V:LM3886 Power supply
This board integrates power rectification and filtering, preamplifier amplification and speaker protection. It does not need to be assembled in the east and west. One board is fixed. The installation is quite simple, the line performance is very stable, and the welding board is more Be careful and avoid the problem of mis-welding solder joints to ensure perfect sound.
◆ When buying parts in the welding plate, it should be noted that the components should be placed according to the drawings. The physical map here can not see the component parameters. The physical map is the most reference. The polarity of the components is the DALE. The resistance is the word resistance. Just look at the number on the resistor and it is OK. Do not distinguish by color.
◆ LM3886 power amplifier chip must use heat sink, chip manufacturers set the static power consumption of 50ma, there is a certain temperature, it is one of the important reasons that LM3886 sound is better than many similar power amplifier chips, even more than many discrete pairs The pipe line should be good, this board has a pair of bookshelf with 120 watts and 8 inches respectively without pressure.
◆ Supply voltage: Dual 15V-Dual 28V (refers to the transformer output voltage, such as 25-0-25)
◆ Board size: 155mm*80mm
◆ Load impedance: 4-8Ω
◆ Output power: Max 68W+68W
◆Board Weight:210g. Cooling weight:365g
◆ Standard two JRC5534DD double-precision humming op amps imported from Japan as preamplifiers, no need to add extra money to the preamp board, we integrate the preamps together, one channel and one op amp, the resolution is very Ok, the vocal sweet bass has strength! Supporting Zhengling Seiko original gold-plated op amp seat, the upgrade is very convenient, no need to change components can directly change many single-channel op amp chips, such as our common OPA627, OPA604, etc., the ground line is strictly designed, reject loop current sound, output two The ground wire is independently returned to the midpoint of the power supply. What is needed is this purely dyed line. No more fancy components are added and no necessary components are deleted.
◆ Add DC servo line, abandon the LM3886 negative feedback floor capacitance, this capacitor has a great impact on the sound, the design allows the 3886 to work in pure DC amplification mode, the sound is very natural and transparent, some people ask DC servo what role? Because when the LM3886 cancels the negative feedback landing capacitor, the output midpoint will be prone to drift non-return to zero. The servo circuit is added to help the 3886 stable operating point, and the circuit is operated in a very good state. The effect is that other lines cannot be compared. of.
◆ PCB board adopts military immersion gold technology, PCB is beautiful and eye-catching, mainly for easier soldering and improved signal current transmission performance.
◆Imported Fairchild LM317/LM337 low-resistance high-current voltage-regulating circuit, combined with Nichicon Nichicon's highest-grade KZ audio capacitor to form the pre-stage power supply regulated filter power supply, the sound of the sound is in every detail.
◆C1237 horn protection circuit, genuine OMRON relay, power-on delay about 3 seconds, the music will ring after the pull-in, immediately disconnect when off, no impact sound, DC ±1.4v trigger protection disconnect output, guard Expensive speakers.
The size of the board is suitable for many chassis on the market. The height of the heat sink is 50mm. If the NOVER 50V10000uf large filter capacitor is installed in the store, the height of the copper plate is not more than 50mm.
Brand Name:
Maximum Power Per Channel:
 2 (2.0)
Model Number:
 High-end LM3886TF 2.0 Audio Amplifier Board


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