Product details:
1. Use original ON Semiconductor MJ15024G / MJ15025G and Toshiba 2SA1930 / 2SC5171.
2. Interstage coupling capacitor adopts WIMA top capacitor 1UF, with natural sound and wide sound field
3. Five-ring metal resistors are used for resistance. The main circuit uses five-ring metal film resistors with an accuracy of ± 1% to ensure a good signal-to-noise ratio.
4. The PCB adopts 1.6mm thick double-sided sheet, 2.0 oz copper thickness, and the whole process of spraying tin to ensure the good passing performance of large and small currents.
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; the sound is beautiful and round, and the sound field is wide. 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 very good performance in the home playback environment.
Basic parameters:
1. Power supply parameters: one set: 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, that is, one board uses one
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. PCB size: 105 * 236MM.
Board: 110 wide (including angle aluminum) * 236MM
6. First adjust the differential input stage current to 2MA: adjust the VR1 (500R) adjustable resistor so that the voltage at the two points of C and D is 1.5-2V (that is, the voltage across the resistor R9 (1K)); at this time, the input differential current is 1.5- 2MA, this value is the best sound quality
7. Large tube quiescent current is 100MA: Adjust the adjustable resistor VR2 (1K) so that the voltage of the two points A and B is 22MV, at this time the static current I = 22MV / 0.22R resistance is 100MA; if the customer&x27;s heat sink is large enough, you can make Increasing the static current, generally 100MA-300MA sound effect is best.
8. Weight: 0.5KG + 0.5KG