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https://pan.baidu.com/s/1095nIUnvWdmD-ftaSh2f9A Extraction code: rf37

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【Protection function description 】

Operational amplifier anti insertion protection，Hands on enthusiasts no longer have to worry about burning operational amplifiers or power amplifiers！ overheatedProtection andHorn protectionAll of them are electronic+PhysicsDouble detection protection。

Input overvoltage、 Input undervoltage、Internal overheating、Internal power supply short circuit and overload、over load 、 Output short circuit、DC output, etc，All of them were usedUltra fast electronic turn off protection technology， Mains power input exceeds260V、Internal power supply short circuit、Power amplifier damaged or output with DC voltage this3species Dangerous situations can turn off the internal power supply，And keep locked，To turn it off manually10Restart in seconds Can be reset，After other protections are triggered，It can resume working automatically after the environment is normal。

—————————————————– Internal process diagram (notes：JFETThe front stage board has been upgraded toJFETDiscrete fully symmetric double differential operational amplifier）

JFETWaveforms of pre discrete test for FET