Features 1、Single Power Supply: Input coupling capacitor uses imported brand infinite capacitors. The board is powered by a single power supply and has a voltage regulator chip, which is convenient to match with a single power amplifier 2、SMD Technology: Manufactured by SMD technology, the power input adds a rectifier bridge, which can be used for both AC and DC 3、No Need to Separate Poles: There is no need to separate the positive and negative poles when inputting DC, which is more convenient to use 4、Volume Potentiometer: Preamplifier board come with volume potentiometer, which possess more stable performance 5、Good Quality PCB Materials: Good quality PCB materials possess reliability and miniaturization, good maintenance and interchangeability Specification Item Type: Preamplifier Board Material: PCB Model: AD828 Working Voltage: DC 7V-24V or AC 6V-16V Package List 1 x Preamplifier Board