Hi Chaps,
I was getting sick of hearing my sub go WHUMP every time I switched it on, so I decided to whip up a simple speaker muting circuit that would leave my sub disconnected from the amp for a second or two after power-up, and disconnect it straight away on power-down. Here's the result:
I also added a DC detection circuit to it which disconnects the speaker in the event of the amp's output stage dying and applying hard DC to the speaker terminals. Basically it's a self-contained single channel speaker protection and muting circuit designed to retrofit into just about any solid state power amp up to a couple hundred watts per channel (depending on the relay used). Changing a couple of resistors will make it run universally off the amp's internal power rails.
I'm aiming to do an "everything" PDF for it - schematic, PCB etch pattern, BOM, construction details - for those of you who'd like to build one. Stay tuned.
I was getting sick of hearing my sub go WHUMP every time I switched it on, so I decided to whip up a simple speaker muting circuit that would leave my sub disconnected from the amp for a second or two after power-up, and disconnect it straight away on power-down. Here's the result:
I also added a DC detection circuit to it which disconnects the speaker in the event of the amp's output stage dying and applying hard DC to the speaker terminals. Basically it's a self-contained single channel speaker protection and muting circuit designed to retrofit into just about any solid state power amp up to a couple hundred watts per channel (depending on the relay used). Changing a couple of resistors will make it run universally off the amp's internal power rails.
I'm aiming to do an "everything" PDF for it - schematic, PCB etch pattern, BOM, construction details - for those of you who'd like to build one. Stay tuned.