Key benefits and features Gain and purpose: provides a 10x amplification (20 dB) to boost small audio signals before driving a power amplifier Output monitoring: front 3.5 mm interface can be connected to headphones for direct monitoring Compatibility: designed to be powered from a DC supply in the range 9 to 19 V Core component: uses a NE5532 dual opamp for reliable audio amplification Specifications at a glance Amplification factor: 10x (20 dB) Power supply: DC 919 V Amplifier chip: NE5532 dual opamp Interface: front 3.5 mm headphone jack How it helps Improves volume and clarity of lowoutput devices by providing a dedicated preamplification stage Enables easy integration with existing power amplifiers to achieve better overall sound levels Provides a straightforward monitoring path via the front headphone jack for listening accuracy 23 practical use scenarios Scenario 1: Desktop or laptop audio boosting Connect a PC, laptop, or mobile device with weak output to a power amplifier, and monitor the result directly with headphones from the front jack. Scenario 2: DIY audio projects Use as a preamplifier module before a power amplifier in a custom audio setup, improving signal level without altering the main amplification chain. Scenario 3: Smallroom listening setups When source output is low, connect this circuit between the source and a power amplifier to achieve a more playable listening level without additional equipment.