I want to make the simplest and most reliable on / off controlled by software (Java).
I was thinking about a sinus sound + RC filter with a relay for a certain frequency, but, unfortunately, I can not use a sound card - it is already taken for different purposes.
How can I achieve this without much compatibility / reliability issues. It should work on both Unix and Windows
I mean the output device, so I want to enable / disable the relay from the Java software.
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