The main difference between the operational amplifiers 2903 and 2904 is their input voltage range and output power. 1. Input voltage range: The input voltage range of the operational amplifier 2903 is relatively large, usually -15V to 15V. The 2904 has a relatively small input voltage range, usually -5V to 5V. This means that the 2903 can handle larger input signals. 2. Output power: The output power of the operational amplifier 2903 is relatively high, usually 250mW. The output power of the 2904 is relatively low, usually 125mW. This means that the 2903 can provide greater output signal power. In addition to these major differences, the two op AMps may also differ slightly in other aspects of their performance parameters (such as gain, bandwidth, input impedance, temperature range, etc.), depending on the manufacturer's design and specifications. Therefore, when choosing to use, it is necessary to choose the appropriate model according to the specific application requirements.