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Any tips on cheap desktop (not rack) hardware products, that have real-time spectrum analyzers and/or peak level meters? These could be a cool addition to many systems. I personally miss the spectrum analyzer of the RME ADI-2 Pro I no longer have...
It's an iPhone 4s or 5 (I forget) with a $4 app called Spectrum which also does octave, FFT and spectral plots in various ways that I use on my current phone. I'm a bookbinder and printer so wrapping it up in some book board and pleather took about 10 minutes. Just made this prototype earlier this week when I saw someone else posting about the expensive single purpose boards on eBay from Asia.
Who among us on this list doesn't have a few old smartphones in a drawer? You could buy an old iPhone for less than one of the "new" OLED screen toys and use it just for this.
I thought briefly about marketing the enclosure but that sounds like a nightmare with all the different phone sizes and shapes so I'll let someone else steal this idea and stick to making books.