i have some Yamaha 120watt in wall speakers (NS-IW470) here at work and was thinking of installing them in a computer lab...
is there a simple way i can amplify these? something i can hide, maybe? volume controlled by the signal level of the computer's speaker output?
is there a simple way i can amplify these? something i can hide, maybe? volume controlled by the signal level of the computer's speaker output?
All you need is an amplifier. You don't need 120w output power rating unless you want full volume. Something like a TPA3125D2 or TPA1517 can run from the 12v supply in the PC and is easy to mount inside the case.
How about a T-amp; complete boards can be bought on eBay for around $20. Search for TA2024, or check the digital amp forum here. The hardest part is finding a suitable power supply; maybe it can run off the PC power supply. Or use a 12V wall wart from a scanner or PC speakers; just make sure it's regulated so no-load voltage isn't too high.
What kinda of amperage??
I have a few spare 12vdc AC adapters... though, probably all under 1amp.
I have a few spare 12vdc AC adapters... though, probably all under 1amp.
Just check amplifiers power. If it is 30w and 12V P=I*U =2.5A now just divide with effiency, for example D Class with 80% I would say 3A. But probably best solution will be PC PSU. Try it, if there is not any noises - use that. Yellow wire = + and Black wire will be GND. And remember that 12V AC means 12V*2^2-1.6 = around 15V DC. So be careful.
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