Core features and function Core technology: LM358 dual operational amplifier configured as two amplification stages on a single board. Signal handling: designed to amplify weak DC signals such as millivolt level inputs and other small DC voltages or DC pulses. Adjustable gain: two potentiometers on the board provide magnification control for the first and second stages, respectively. To increase gain, turn each potentiometer counterclockwise. Overall gain: the total magnification is the product of the gains of the two stages, allowing a wide and substantial range of amplification. Key benefits Improves visibility and measurability of weak signals for monitoring, data acquisition, and instrumentation. Flexible gain tuning with independent control for each stage, enabling precise amplification without overpowering the signal. Uses a common, reliable LM358 core, offering consistent performance for DC amplification needs. Performance and usage notes Gain can be adjusted in two steps via the separate potentiometers, giving control over both stage gains and enabling large overall amplification when needed. Suitable for applications where DC voltages or DC pulses are present and require amplification before further processing or measurement. Typical use scenarios Data logging and measurement: amplify small DC sensor outputs (such as temperature, pressure, or chemical sensors) to a level suitable for ADC input or display. DC pulse observation: boost weak DC pulse signals for clearer observation and analysis in oscilloscope or monitoring circuits. Laboratory experiments: provide adjustable, twostage gain for precise amplification of lowlevel DC signals in test setups. Notes on compatibility and implementation Core component is the LM358 based twostage amplifier module, intended for use where DC weak signals require amplification with adjustable gain. The dualstage arrangement with separate gain controls allows tailored amplification in systems that require precise signal conditioning of DC voltages or pulses.