E405 power amplifier board (refer to the golden throat circuit)
Product Description:
All parts of this product are original and authentic, unpretentious, and pure quality; the use of high-quality original parts is not only a guarantee of safety and quality, long service life, but also a strong guarantee that the actual performance can meet the design goals. The pursuit of first-class quality is our consistent aim. The Golden Throat E405 is an upgraded version of the E305. The E305 also belongs to the diamond-diamond architecture of the FET double differential input of the FET. It has extremely low crossover distortion. Unlike the E305, the E405 is pure DC. The entire line does not have a coupling capacitor. There is no feedback capacitor, it is a type of current negative feedback, with excellent dynamic response and dive depth, this line refers to the pure post stage of Golden Throat E405, with a DC servo circuit (served by OP07 with extremely low noise), OMRON relay +C1237 Seat speaker protection escorts your speakers; adds output overload and overcurrent protection.
E405 sound characteristics: natural and slender, wide sound, great dynamic effect is excellent, the biggest feature is the extremely deep bass dive.
product details:
n Use original Toshiba A1943/C5200 and 2SA1930/2SC5171.
n Inter-stage coupling capacitor adopts WIMA top-level capacitor 1UF, and electrolytic capacitor signal main circuit adopts imported Panasonic brand, which ensures strong and continuous power support.
n The resistance adopts five-ring metal resistance, and the main loop adopts five-ring metal film resistance with an accuracy of ±1%, which ensures a good signal-to-noise ratio of the whole machine.
n PCB adopts 1.6mm thick double-sided board, 2.0 ounce copper thickness, and full tin-spraying process to ensure good passing performance of large and small currents. First-class PCB quality.
n 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 switching on and off and the DC output protection function, making your speakers safer.
n The wiring layout of the entire circuit board is quite rigorous and reasonable, and the overall PCB wiring adopts one-point grounding. The power amplifier board is stable and reliable, and the output power is large; the sound is beautiful and round, and the sound field is wide. Strong three-dimensional sense, low frequency is stable and powerful, the signal-to-noise ratio is quite excellent, the dynamic range is wide; the details are clear, the transient response is excellent, and all kinds of music can be played with ease, and it has a very good performance in the family's playback environment.
Basic parameters:
1. Power supply parameters:
A group: DC+-(35V-55V) recommended +-45V (AC: transformer 300W dual 32V, need to add rectifier board)
Another group: single AC12V (note: each board is powered independently by a single AC12V power supply, that is, one board is powered by a single AC12V power supply)
2. Power: 300 watts (total harmonic distortion THD+N<0.1%), DC+-45V, 4Ω
3. Class A 90W, measured under 4Ω load
4. Speaker impedance: 4-8Ω.
5. PCB size: 59*236MM.
Board size: length 236*width 95*height 30MM
6. First adjust the differential input stage current to 2MA: adjust the VR1 (500R) adjustable resistance so that the voltage at the two points of C and D is 1.5-2V (that is, the voltage across the R9 (1K) resistor); the input differential current is 1.5- 2MA, this value is the best sound quality
7. The static current of the large tube is 100MA: adjust the adjustable resistance VR2 (1K) so that the voltage at the two points of A and B is 22MV, then the static current I=22MV/0.22R resistance is 100MA; if the customer heat sink is large enough, you can make Increase the static current, generally 100MA-300MA sound effect is best.
8. A pair of left and right symmetric output and input
9. Big tube pairing
