Features

• This product is a kit type product that can be used not only with LV-2.0 series amplifiers but also with self-made power amplifiers. By providing a protection circuit, it protects important speakers by blocking the inflow of a large DC current to the speakers immediately before the power amplifier fails.
• The features of this product include a two-channel power amplifier circuit and a headphone amplifier circuit, and the addition of an optional dedicated power supply circuit and a power-off/shutdown circuit to speed up relay off at power-off. Not only can it be integrated into the LV2.0, but it can also be integrated into other self-made power amplifiers. However, some knowledge of electrical engineering is required to use it, so please use it according to your ability.
• [Protection Board Operation Overview]
• When the power is turned on: A mute time of about 5 seconds is set immediately after the power is turned on in order to suppress the DC fluctuation (commonly known as a bumping sound) of the amplifier output.
• Power amplifier failure: If a DC potential is generated in the amplifier output, the amplifier and speakers will be cut off. If the protection is activated, the relay will remain off. To prevent further damage to the amplifier circuit, turn off the power to the amplifier immediately.
• When the power is turned off: The delay time until the relay is turned off is designed to be the minimum, but if you still cannot avoid the popping sound when the amplifier is turned off, increase the capacitance of the power capacitor in the amplifier circuit or short circuit the CN4 pins in conjunction with the amplifier's power switch being turned off. Alternatively, use the optional fast shutdown circuit.