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YJ +/-45VDC NJW0281 + NJW0302 + 2SA1930 + 2SC5171 Golden Voice E305 Amplifier Board One Pair
- Using original NJW0281 / NJW0302 and 2SA1930 / 2SC5171.
- Resistance selection Rings metal resistance, the main circuit employs a precision of ± 1% metal film resistors rings, ensure the machine a good signal to noise ratio.
- 1.6mm thick sheet using double-sided PCB, 2.0 oz copper thickness, HASL whole process to ensure that the size of the current through the good performance. PCB-class quality.
- The entire circuit board trace layout is quite strict and reasonable, the overall PCB traces using a little grounding. The amplifier board is stable and reliable, high output power; beautiful mellow sound, open sound field. Dimensional sense of strong, solid and strong low-frequency steady, very good signal to noise ratio, wide dynamic range; the details clear, excellent transient response, playing all kinds of music are comfortable with, in the home of the playback environment has a very good performance.
- Power: DC +/- (35V-55V) recommend +/-45VDC
- Power: 250W (+ - 85V 4 Euro) total harmonic distortion THD + N <0.3%), CPI 90W, 4 ohm load measured at
- Speaker Impedance: 4-8 ohms.
- PCB size: 57 * 235MM.
- Adjust VR1 (1K precision adjustable resistors) quiescent current makes about 50MA, namely: the output voltage across V1 and V2 point about 11MV (R30 output voltage across the resistor 0.22 Europe divided by this resistance value is the quiescent current), these two points located output (OUT) side. VR1 counterclockwise quiescent current becomes large, clockwise is reduced! Supporting fins 50-100MA quiescent current is adjusted to more appropriate (ie 11-22MV), the bass is very vigorous and effective!
2. The midpoint zero, adjust VR2 (500R close adjustable resistance), so that the output (OUT) to ground (i.e., the amplifier output terminal ends) near zero mV; no mismating resistance can be adjusted to 0MV, at worst can be adjusted to a few millivolts.
- Amp board x 1 pair