功能

• Protect important speakers and headphones in the event of a power amplifier failure! Compact size 72×47 mm based on the LV concept. The μPC1237HA manufactured by Renesas Electronics is d as the key device for protecting the module. MOS-FET or mechanical relay can be selected as the cutoff device for the circuit. Headphone amplifier circuit protection function and mechanical relay can be d as cutoff device. Speaker circuit connection delay function eliminates POP when the power is turned on. Can be d for power amplifiers other than the LV series.
• 【 Protection board operation overview 】
• The mute time is set to about 5 seconds immediately after the power is turned on in order to suppress the output DC fluctuation (commonly known as a bop sound) of the amplifier when the power is turned on. (Mute time can be changed by changing the constant value of C4 or R8.) Power amplifier failure The amplifier and speakers will be cut off if a DC potential is generated in the amplifier output.
• If protect is enabled, the protect circuit will be in latch mode until the power is completely turned off. In the speaker protection circuit, the MOSFET switch type and the mechanical relay type cannot be d at the same time, and either type is selected. In the case of the MOSFET switch type, the MOSFET switch is in the negative side (GND side) of the power amplifier output, unlike a normal protection circuit, in order to increase the reliability of the circuit. Therefore, it cannot be d with BTL amplifiers. If you want to it with a BTL amplifier, a mechanical relay type.