Even simpler Software Defined Radio (and thoughts on soundcards)

https://bit.ly/2sbx7Wa See the secret sale page at Djsoft.
Is this the simplest possible software defined radio? This video discusses the importance of a good computer soundcard, walks you through the circuit of a simple SDR for 3.5 MHz and then gives a demonstration of it. Covering a 96 kHz segment of 80 metres, it's an ideal way for the beginner to sample software defined radio (or amateur radio HF activity). Just one transistor and about $20 worth of parts are all that's needed to build. Change the crystal and front end tuned circuit for coverage of other frequencies in the low HF region. Eg removing one of the 100pF capacitors and substituting a 5 MHz crystal might work for receiving WWV on 5 MHz (not tried).