A2 is a low-key product with excellent performance indicators! Suitable for excellent and high-quality sound performance.
Refer to the original circuit design of Bayer A2, combined with the designer''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s own ideas, the newly designed and improved A2-PRO professional-grade headphone amplifier, with professional-grade monitoring sound quality, sound in one step. Although the sales volume of this model is not high, it has just been put on the shelves and is still waiting for potential customers to discover that it is the next generation product of our store’s A1 amp. The integrated idea makes DIY simple and more efficient.
Dimensions: 210×45 high×188
Gold-plated or silver-plated headphone sockets used by high-end products are shipped randomly!
PCB plus board components: including on-board components! The potentiometer is a 16 potentiometer made in Taiwan,The headphone socket is a Yongsheng headphone socket.
A full set of spare parts: including all the accessories in the machine! ! The potentiometer is a 16 potentiometer made in Taiwan, and the headphone socket is a Yongsheng headphone socket.
Highly equipped with a full set of spare parts:Including all the accessories in the machine!The potentiometer is ALPS27 large shell, +2 Swiss Nutrick gold-plated headphone socket.
.The picture below is the real shot pictures of some products for your reference!
Compared with the A1 amp, the integrated design is used, which reduces the cumbersome assembly. Only one audio cable needs to be connected, no complicated wiring is required, and the DIY success efficiency is higher. It is also easy and easy to achieve zero noise!
1: Dual headphone jack output, compatible with high-impedance and low-impedance headphones, suitable for all impedance ranges from 16-600 ohms
2: The front panel switch uses an excellent Taiwan brand, which has a much better feel and reliability!
3: Two types of sealing ring can be selected, the price is the same! Please note
4: Integrated EMI filter, double capacitor filtering effect is better!
5: The relay uses Japan''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s Takamizawa signal special relay!
6: LM317 is used for voltage stabilization, 337 is competent! !
Click! !High quality power cord
Click! !Akihabara 3.5 rpm dual lotus audio cable
Click! !The DAC module can be expanded in the card slot! !
The 2018 expansion card is blue! ! !
Yaohua Customized Sealing Ring Bull! On the left is the onboard EMI filter!
Adopt integrated design, avoid external connection, easily achieve zero noise!
Symmetrical design, optimized wiring, star-shaped grounding, zero noise, and excellent separation!
The red Taiwan switch has a long service life. The relay uses the Takamiazawa signal relay!
Dual earphone jacks, can connect 2 earphones at the same time, easily adapt to different models of earphones
PCB type power socket, built-in EMI filter, the essence of power is more pure! Use Philips safety capacitors!
Multi-stage parallel filtering and decoupling can effectively filter high-frequency interference and noise, and the bottom noise is completely driven away!
The overall design is generous and elegant, the owner''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s favorite, and the sound is more durable!
WIMA parallel grenade fast diode, imported from Philips, the best rectification solution!
Why use A2 amp:
The power amplifier is equivalent to a low-power power amplifier with a small power output. General audio sources such as mobile phones and MP3 can only drive general headphones. The sound strength is not concentrated enough, the bass is dull but not heavy, and the high pitch is not bright. I feel impatient after using it for a long time. The amp has sufficient output capacity and better current distribution capability, which can easily drive 600Ω headphones. The addition of earphones forced both sound strength and relaxation. Improved sound performance.
Installation component description:
1. There is 1237 on the front of upc1237, and the one on the left is 1 pin.
3. MC33078 op amp（Beyer''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s original machine is equipped with this op amp）Have a certain quality! Replaceable op amp to change the sound
4. Both 50K and 100K of the volume potentiometer can be recommended ALPS16 or 27
5. The voltage of the transformer can be double 15-double 18. It is not good if it is too high or too low. The power is 10W-30W.
There are no components that need to be adjusted on this board, and it can sound normally if installed correctly according to the component parameters marked on the PCB.