LM358 Dual Op-Amp Weak Signal Amplifier Module

🎚️ LM358 Weak Signal Amplifier / Voltage Amplifier Module

This small LM358-based module takes a faint analog signal and boosts it to a level your microcontroller or ADC can actually read. It is built around the industry-standard LM358 dual op-amp and gives you a trim-pot for gain, so you can tune the output live while watching your readings.

✨ Key Features

• LM358 dual operational amplifier — stable, well-documented, and happy on a single supply.
• Adjustable gain via the on-board trim potentiometer — dial the amplification to suit your sensor.
• Analog voltage output — feed it straight into an Arduino/ESP32 ADC or an oscilloscope.
• On-board power indicator LED and clearly marked input/output/ground pads.
• Compact PCB with mounting holes for permanent installs.

📋 Specifications

• Amplifier IC: LM358 (dual op-amp)
• Supply: single DC rail, typically 5V (the LM358 itself supports roughly 3-30V)
• Input: weak analog voltage signal (AC or slowly varying DC)
• Output: amplified analog voltage within the supply rails
• Gain: adjustable with the on-board potentiometer
• Board: small form-factor PCB with header/solder pads

🔧 Perfect for

• Reading low-output sensors: thermocouples, photodiodes, strain gauges, current shunts
• Audio and AC signal experiments where a scope needs a bigger signal
• Arduino/ESP32 analog front-ends and data-logging builds
• Learning op-amp circuits without wiring a breadboard from scratch

Classroom note: the LM358 is not rail-to-rail, so leave some headroom at the top and bottom of the supply when choosing your gain.