Product Description:
All parts of this product are original authentic, simple and pure, pure quality; the use of high-quality original parts, not only safety, full quality is guaranteed, long life, and more importantly, a strong guarantee that the actual performance can meet the design goals .
E405 is an upgraded version of E305. It is a diamond rhombus structure that belongs to the dual differential input of FET FETs. It has extremely low crossover distortion. Unlike E305, E405 is pure DC. The entire circuit does not have a coupling capacitor and no Feedback capacitor, which is a current negative feedback type, has excellent dynamic response and dive depth.
This line is pure rear stage of E405, with DC servo circuit (played by OP07 with extremely low noise), Omron relay
+ C1237 speaker protection to protect your speakers; increase output overload and overcurrent protection.
E405 sound features: natural and slender, wide sound, great dynamic effects, the biggest feature is the extremely deep bass dive.
product details:
1. Use the original ON Semiconductor MJ15024G / MJ15025G (paired installation).
2. Interstage coupling capacitor adopts WIMA top capacitor 1.5UF, with natural sound and wide sound field
3. The resistor is 1% Beijing 718 Fever Resistor.
4. The PCB adopts 2mm thick double-sided sheet, and the whole process of spraying tin, to ensure the good passing performance of large and small currents, and first-class PCB quality.
5. The biggest feature of this board is the use of the current advanced C1237 BTL speaker protection circuit, which effectively eliminates the impact sound of on and off and DC output protection, making your speakers safer.
6. The wiring layout of the entire circuit board is quite rigorous and reasonable, and the overall PCB routing uses a little grounding. The power amplifier board works stably and reliably, with high output power; beautiful and round sound, and wide sound field. Strong three-dimensional sense, stable and powerful low frequency, excellent signal-to-noise ratio, wide dynamic range; clear details, excellent transient response, easy to play all kinds of music, and has a good performance in the home playback environment.
7. The price is the price of a pair of boards
Basic parameters:
1. Power supply parameters: one group: DC +-(35V-55V) recommended + -45V (AC: transformer 300W double 32V, need to add rectifier board) another group: single AC12V (Note: each board has a single AC12V power supply independently, Ie one for each board
Single AC12V power supply)
2. Power: 200 W (total harmonic distortion THD + N <0.1%), DC + -45V, 4 Euro
3. Measured at 60W under 4A load
4. Speaker impedance: 4-8 ohms.
5. Size: 92mm wide (including angle aluminum) x240MM
6. First adjust the differential input stage current to 2MA: adjust the 500R adjustable resistor so that the voltages at C and D are (1.5-2V); at this time, the input differential current is 1.5-2MA, which is the best sound quality.
7. Large tube quiescent current is 100MA: Adjust the adjustable resistor 1K to make the two points A and B voltage 22MV. At this time, the static current I = 22MV / 0.22R resistance is 100MA; if the customer's heat sink is large enough, it can increase the quiescent current. , Generally, the sound effect of 100MA-300MA is the best.