The LTC6227, used in this design, is "last time buy." The replacements aren't as good: either higher noise or lower GBW, and they too will vanish in a few year

The LTC6227, used in this design, is "last time buy." The replacements aren't as good: either higher noise or lower GBW, and they too will vanish in a few years. That is, of course, deliberate, forcing designers to climb the curve of ever more expensive, exclusive components. Another component in this design, the FST3253, is also a figment of history: no longer produced. Electronics is a nasty rat race, with AD, for example, having bought literally all of their competitors except TI, we have an perfect ADC/DAC/op-amp oligopoly, with everything getting worse with each passing day. So the notion of a cheap, easily reproduced "crystal radio for the digital age" isn't actually workable: nothing you can dream up will be buildable more than 2-3 years after you design it as the components you've chosen cease to exist.