The power amplifier board is added with a DC servo circuit, and the ground capacitor of the LM3886 negative feedback is abandoned. This capacitor has a great impact on the sound. The design makes the 3886 work in pure DC amplification mode, and the sound is very natural and transparent. Some people ask what is the role of the DC servo? Because When the LM3886 cancels the negative feedback landing capacitor, the output midpoint will easily drift and not return to zero. A servo circuit is added to help the 3886 stabilize the operating point, so that the circuit can run in a good state and get better results.
LM3886T bile power amplifier IC, with warm tone, thick bass and bright treble. Audio input coupling capacitors make music more pleasant.
Four OPO7 low-noise precision operational amplifiers, the sound is very delicate and audible, and the midpoint is extremely stable. The main filter capacitor adopts 10000uF/50V audio custom capacitor, and adopts 25A and above rectifier flat bridge to ensure strong and continuous power support.
All resistors are made of 718 military factory high-quality 1% to ensure a good signal-to-noise ratio and consistency of the whole machine.
◆LM317/LM337 low-resistance voltage regulator circuit, the sound quality lies in every detail. C1237 horn protection circuit, genuine Omron relay, the power-on delay is about 3 seconds, and the music will sound after the pull-in, and it will be disconnected immediately when it is turned off, no impact sound, and guard the horn.
Basic parameters:
Working voltage: AC dual 15V-28V 150w
Dual 18V 120W transformers are recommended
Left and right channel maximum output power: left and right channel 68Wx2
It is recommended to use 4-6 inch / 4-8 ohm 20-40W full frequency speakers
PCB size (with heat dissipation) about: 155mm *100mm*55mm
Logistics information
Our products are located in Hong Kong, China, and the logistics speed depends on your specific location. According to our experience, it usually takes about 15-20 days of transportation time
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How to choose the correct size:
Step 1 Please measure your foot length carefully.
Step 2 Please choose the correct size according to your foot length and chinese size.
For example, If your foot length is 255 mm , you should choose the size 8.
