Description
TDA7294 LM3886 Combination Power Amplifier Board 2.1 Amplifier with Subwoofer Volume Adjustable
Product Description
LM3886 is a well-known high-performance audio power amplifier integrated circuit of the United States National Semi (NS), the maximum output power can reach 68W, the sound is accurate and vivid, noise and distortion are quite low, and the protection function is relatively complete, and the performance is stable. Once the LM3886 was launched with rave reviews, it soon became the configuration of large and medium power HIFI audio amplifiers and high-fidelity active monitor speaker amplifier circuits. Le Lin, a famous American audio manufacturer, has an expensive machine with LM3886 as the core of amplification. It can be said that LM3886 is one of the audio power amplifier ICs that every audio enthusiast must play and often play. TDA7294 is a field tube output high-power integrated circuit developed by the famous European SGS-THOMSON STMicroelectronics in the 1990s. Quite courageous. It has completely changed the raw, cold, and hard tone of the previous successful playback, and is widely used in the HI-FI field. The design of the chip focuses on sound. It has high pressure resistance, low noise, low distortion, high power, and soft sound and durable.
Feature
1. Using brand new original LM3886 and TDA7294. 2. The front input capacitor and the inter-stage coupling capacitor adopt CBB's top capacitor 2.2UF. The electrolytic capacitor signal main circuit adopts a famous Taiwanese brand. The main filter capacitor adopts Black King Kong with a capacity of 10000UF/50V*6. The total capacity reaches 6WUF. The rectifier adopts domestic 25A and above. The flat bridge guarantees strong and continuous power support. 3. Five-ring metal resistance is used for the resistance, and the main circuit adopts a five-ring metal film resistance with an accuracy of ±1%, which ensures good signal and noise of the whole machine. 4. PCB adopts 1.6mm thick double-sided board, 2.0 oz copper thickness, and full tin spraying process to ensure good passing performance of large and small currents. First-class PCB quality. 5. The negative feedback tuning designed in the pre-stage tuning part can reduce crossover distortion and have a better listening experience. 6. The use of gold-plated round hole IC holder is not a normal IC holder, but more durable! 7. The subwoofer part is composed of two brand-new TDA7294 BTL outputs, and the low-pass filter is designed in accordance with the home theater-style frequency adjustable design (50-150HZ) with strong power! The left and right channels are served by two LM3886s respectively. 8. The wiring layout of the whole circuit board is quite rigorous and reasonable, and the whole PCB wiring adopts a point grounding method. The power amplifier board works stably and reliably, with large output power; the sound is beautiful and round, and the sound field is open. It has a strong stereo effect, stable and powerful low frequency, excellent signal-to-noise ratio, wide dynamic range; clear details, excellent transient response, and can play all kinds of music with ease, and has a very good performance in the home environment.
Specification
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1
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Power supply voltage: AC dual 20V-28V, recommended dual 26V/300 watts or more
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2
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Output power: 68W*2 (left and right channels) + 160W (8 ohm subwoofer)
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Speaker impedance: 4-8 ohms
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4
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PCB size: 236*98*55 MM
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5
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Center distance of potentiometer: 25MM
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6
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From left to right potentiometer: bass frequency, bass volume, left and right channel total volume, left and right channel bass, left and right channel treble, total volume
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Details Images