Welcome to our shop! This voltage amplifier module is designed to amplify weak signals that are millivolts or even weaker. It features two potentiometers that can be rotated counterclockwise to increase the amplification. The core of this module is the LM358, a two-stage operational amplifier that is capable of amplifying DC weak signals, such as DC voltage signals and DC pulse signals. There are two potentiometers on the board for single-stage magnification adjustment of the first and second stages respectively. The total magnification is the product of the multiple of these two potentiometers, allowing for a wide range of magnification adjustments. For example, if the first stage is adjusted to 20 times magnification and the second stage is adjusted to 100 times, the total magnification will be 2000 times. This voltage amplifier module operates on a supply voltage of 3.5-24V DC and has a maximum current output of 15-20mA (non-linear). The voltage output is calculated by multiplying the input voltage signal by the magnification. The board size is approximately 45.3mm / 1.8in in length and 16.2mm / 0.6in in width. 100% Satisfaction: Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactory after-sales service.