XD-21 LM358 Gain Amplification Module Operational Amplifier Module is based on the LM358 operational amplifier which is a high-gain, frequency compensated operational amplifier designed to operate from a single power supply over a wide range of voltages. It is used in conventional operational amplifier circuits that need to be operated from a single power rail.   Specifications On-board LM358 chip Adjustable gain up to 100x On-board 10K adjustable resistor for gain adjustment On-board power indicator Chip has been drawn out to the main pins for direct input and output of signals Working Voltage Range: 5 V to 12 V Board Size: 32.7 x 13.3 mm Package Includes : 1 x XD-21 LM358 Gain Amplification Module. Category: Audio Module