My unit has stopped working. Mini input jack may be bad. How do I return for replacement? purchased 9/2/22

Try a new supply for cable to usb ie another high power charger.

Can this amplify a video signal to allow splitting on multiple viewing screens ?

No. It is for audio only (and in my opinion, doesn't even do that well). You need a device that is specifically for video, like this: https://www.amazon.com/MT-VIKI-Splitter-Composite-Distribution-Amplifier/dp/B0882RHYTW/ This will take a composite video input, amplify it, and provide multiple outputs. It also does the same for the associated audio inputs.

What are the exact dimensions of the power connector? The connector has 2 dimensions, the outer diameter and the inner pin diameter (5.5 mm x?)

I don't know. My Mini Stereo Line Level Amp stopped working the second week I owned it. I recommend buying something else.

Will it give a full 2 volt line out RCA signal

So long as the input level is sufficient to create a 2V output signal, the answer is yes. If the input signal is not of sufficient amplitude it will/can not.

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L1 Mini Stereo Line Level Booster Amplifier Audio Preamp with 20dB Gain and Volume Control

L1 Mini Stereo Line Level Booster Amplifier Audio Preamp with 20dB Gain and Volume Control

Product ID: 243819127

Details

Brand
Douk Audio
Manufacturer
Douk Audio
Maximum Supply Voltage
26 Volts (DC)
Minimum Supply Voltage
26 Volts (DC)
Mounting Type
Surface Mount

⚡20dB max gain with ±12.5V output

🔌3 input/output interfaces

🛠️DIY-friendly pluggable op amp socket

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Rp1675967

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Sold byAmazon IndonesiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎧 Elevate Every Note — Boost Your Audio Game Like a Pro!

VERSATILE USE CASES - Perfect for home stereos, mixers, karaoke, live events, or office setups craving that extra volume edge.
POWERFUL SIGNAL BOOST - Amplify your audio line by up to 20dB for crystal-clear, room-filling sound without distortion.
UNIVERSAL CONNECTIVITY - Seamlessly integrates with phones, TVs, computers & more via 3.5mm AUX, RCA, and 5-DIN ports.
COMPACT DURABLE DESIGN - All-metal chassis with electromagnetic shielding ensures longevity and noise-free performance in any setup.
CUSTOMIZABLE SOUND EXPERIENCE - Swap out the NE5532P op amp easily to tailor your audio signature and indulge your inner audiophile.

The Douk Audio L1 Mini Stereo Line Level Booster is a compact, high-gain preamp designed to amplify low-volume audio sources by up to 20dB. Featuring multiple input/output options (3.5mm AUX, RCA, 5-DIN), a robust ±12.5V output voltage, and a DIY-friendly pluggable op amp socket, it delivers clear, warm sound with ultra-low distortion. Its durable all-metal build with electromagnetic shielding makes it ideal for diverse environments—from home audio systems to live stage events—ensuring enhanced volume and pristine audio clarity for professional and enthusiast users alike.

Specifications

ASIN	B08L4WYSZ4
Best Sellers Rank	#33,078 in Electronics ( See Top 100 in Electronics ) #175 in Audio Component Amplifiers
Brand Name	Douk Audio
Customer Reviews	4.1 4.1 out of 5 stars (329)
Manufacturer	Douk Audio
Maximum Supply Voltage	26 Volts (DC)
Minimum Supply Voltage	26 Volts (DC)
Model	XZ-L1
Mounting Type	Surface Mount
Number of Channels	2
Output Power	12.5 Volts
Part Number	XZ-L1
Unit Count	1.0 Count

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