I humbly ask for assistance with a somewhat simple little project I am trying to finish. The project I have started is to have several reels of LED lights flash triggered by the RCA type subwoofer output of a receiver. Some specs are as follows:
ATX PSU converted – 12V @ 24 AMP Max output
On-On Rocker Switch – 12V 16 AMP (Normal Mode/ Beat Mode)
LED Strips – 12V 10 AMPS Max
LED Controller – 12V 24 AMP Handling Capacity
Subwoofer Output Line – 2 V @ 50K Ohms Max Output? Amps Unknown MOSFET? 12Volt + / 10 AMP Continuous / Gate (trigger on?) Volts Unknown - Fan Cooled No Heatsink
My troubles are that I do not know exactly what the subwoofer output RCA power is only what it would not usually be more than at full power. Specs. I were able to find on other players generally say no more than 2 Volts @ 50K Ohms. So I have no way of knowing for certain how low the voltage or amps. are at normal listening levels. If someone did know (HINT HINT) that would lead us to the second most difficult problem.
Choosing a proper switching device. I have seen videos of others using an N MOSFET (TIP30) to flash LEDs however none off of an RCA nor at the amps. I intend. Is a MOSFET not what I need? If it can be then I need one which opens at a very very low, unknown voltage. I have seen that many handle the 12V 10 Amps easily.
I have tried to contact manufactures. I have contacted distributers both national and local who are reluctant to discuss the issue and find me a $1.00 - $3.00 part. I have contacted my local shops for advice but have found my knowledge surpasses their own which is just sad. I have also tried filtering through different manufactures MOSFET spec sheets but it is all so confusing for the novice and they even seem to be switching terminology leaving me with a giant hole in my wall where I’ve twice put my head through. I try to learn, I try to figure things out on my own, but I cannot. Can someone please help me with a widely available part number for something like the MOSFET I intended that I can order? Thank you for your time.