Single-supply power supply, tone board with industrial-grade op amp AD828, advanced technology, compact size design, supports both AC and DC input. The potentiometer separate version allows easy installation, not limited by cabinet spacing, and uses shielded cables to prevent interference issues. Both op amps feature gold-plated round-hole sockets for reliable contact. If the AD828 does not meet performance requirements, it can be easily replaced with a higher-performance op amp chip. Color: Red Material: Plastic Available versions: Potentiometer fixed version, potentiometer split version Potentiometer spacing: 25mm Note: For the separated potentiometer version, the two wires of the same potentiometer must not be swapped arbitrarily, otherwise the device may operate abnormally. The four potentiometers in the separate version may need to be repositioned upon arrival before use. Working voltage: AC 3V–16V, DC 5V–24V Board size: 100mm x 45mm (excluding potentiometer protrusion) Overall board height: Approximately 23mm Four-potentiometer spacing: 25mm (for fixed version) Package Contents: 1 x Stereo Preamp Amplifier Board (Other accessories not included) Note: Lighting conditions and display settings may cause slight color variations between the image and the actual product. Measurement error allowance: +/- 1–3cm.