Update on Aug 13, 2024，This upgrade is mainly an improvement to MOPA’s ability to match audio signal sources. MOPA integrates a signal amplification module internally, which can amplify the signal of a high-impedance output signal generator. The previous MOPA was basically only compatible with GB4000 and FY6900. Currently, it is basically compatible with all signal generators or single-chip computers or 555 circuits. Technical parameters: Compatible with COMS/TTL signal inputs, the effective high input voltage is greater than 1.8V (logic 1), and the effective low input voltage is less than 0.8V (logic 0). Setting of the signal generator: Select COMS or square wave for the waveform, and the output positive voltage signal is only greater than 1.8V. Generally, the amplitude is set to 3V. If MOPA cannot be driven, it means that the actual output positive voltage signal at this time is 1.5V (difference between signal generators). At this time, you only need to modify the amplitude to 6V.