1. The speaker protection board is designed and manufactured with UPC1237 special chip, with functions such as boot delay, DC protection, instant shutdown, etc., to protect your expensive speakers in an all-round way2. The plate is made of 1.6MM high-quality FR-4 plate with thickened copper foil and sprayed with tin, and the size is 65 x 50mm.3. The relay is for Songle high-quality 10A, and the resistors are all five-ring gold film copper foot resistors. And with a red power indicator light, the relay is pulled in for about 3 seconds after booting, indicating that the green light is on, and the work indicator function4. The voltage of this protection board is AC 10V-18V and DC 12-24V for a single power supply. You can take a set of electricity from the power amplifier board.5. Use independent windings or separate power supply as much as possible.Function:1. Power-on mute delay, shutdown quick-break.2. Power amplifier mid-point potential protection, mid-point DC starting control pointgreater than 0.7V3. This protection board can be used with 1875 power amplifier board, and can also be used with LM3886, TDA7294, TDA7293, etc.4. All finished boards are debugged and tested with power onSpecification:Product name: UPC1237 speaker horn protection boardModel: UPC1237Contact load: greater than 0.7VContact switching current: 12-24VContact switching voltage: 10V-18VContact form: 0Rated current: greater than 0.7VRated voltage: 10V-18VProtection features: shutdown and quick shutdownPCB size: 65 x 50 x 1.6mm (thickness)Finished board size: 65 x 50 x 30mm (height)color:BlueMaterial:PCB+MetalPackage Contents:1 x UPC1237 speaker horn protection boardOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.