The speaker protection board has the function of power-on delay (about 3 seconds) and DC protection (control voltage is about 1V). The board circuit is simple, easy to manufacture, safe and reliable. With LED status display, it lights up when it is protected, and it works normally. It is extinguished at the time. It adopts 15A high current relay, which is suitable for most power amplifier boards. The working voltage is 12-15V, which needs independent power supply.
1. Speaker protection requires independent power supply and cannot share one winding with other circuits.
2. The BTL circuit requires two sets of protection boards (one set of one channel)
3. The protection board is only suitable for dual power supply amplifiers, and cannot be used for single power supply amplifiers.