Amplifier overcurrent protection circuit

The utility model discloses an amplifier overcurrent protection circuit. The amplifier overcurrent protection circuit is characterized in that a current sampling resistor is additionally arranged in an output tube, a triode is controlled through voltage on the sampling resistor, then, the current of a base electrode of a former-stage driving tube of an amplifier is reduced, and the overcurrent protection is realized. During the overprotection, the current of the base electrode of the former-stage driving tube is reduced by the triode controlled by the sampling resistor, and meanwhile, an optical coupler is started, so that an output relay is controlled to switch off a load. The delay suction of the output relay can be realized through a delay circuit in the output relay. The amplifier overcurrent protection circuit provided by the utility model has the advantages that through the combination of current limiting type overcurrent protection and cut-off type overcurrent protection, the maximum output current can