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AD828 Operational Amplifier Front Stage Amplifier Board
The AD828 Operational Amplifier Front Stage Amplifier Board is a value-for-money audio amplifier module designed for everyday users. It features Item Type: Amplifier Board and Model No. / Name: AD828.
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About This Product
The AD828 Operational Amplifier Front Stage Amplifier Board is a value-for-money audio amplifier module designed for everyday users. It delivers reliable performance at an accessible price.
Key Specifications
- Item Type: Amplifier Board
- Model No. / Name: AD828
- Operating Voltage (VDC): DC 3.8 – 15 — works with standard household power
- No. of Channels: 2
- Length (mm): 25
- Shipping Weight: 0.004 kg
- Shipping Dimensions: 5 × 3 × 2 cm
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AD828 Operational Amplifier Front Stage Amplifier Board is ultra-compact preamplifier board is designed for high-sensitivity sound pickup using a piezoelectric ceramic chip. Ideal for musical instruments like guitars, erhus, and similar acoustic setups, the chip responds to solid-borne vibrations while filtering out airborne noise—minimizing feedback and self-excitation.
AD828 Operational Amplifier Board is built with either a high-fidelity AD828 or TDA1308 audio op-amp, it offers low-voltage operation (3.8V–15V) and a dual-channel design, making it perfect for stereo setups or single-channel applications with noise isolation.
Note: To adjust gain, change resistor R5 (5k–150k Ω). Higher resistance = higher gain. If using a through-hole resistor, remove the original SMD resistor and solder the new one to the reserved pads.Features:
- Solid-Vibration Sensitivity: Piezo ceramic pickup detects vibrations from solid surfaces with high accuracy — ideal for stringed and percussive instruments.
- Noise Reduction: Rejects air-borne sound, reducing environmental noise and preventing feedback or whistling caused by self-excitation.
- Dual Channel Design: Two-channel setup for stereo or dual mono operation; if using only one channel, ground the unused input to avoid signal interference.
- Low Voltage Operation: Optimized for 3.8V–15V DC input; suitable for direct lithium battery use.
- Hi-Fi AD828 Op-Amp: Uses the AD828 "fever-grade" op-amp for low-noise, high-fidelity signal amplification.
- Ultra-Compact Size: Extremely small form factor allows easy installation in confined instrument enclosures or DIY projects.
- Battery or Linear Supply Only: No onboard regulator; must not be used with switching power supplies to avoid noise or interference.
