WSPR Receiver

I drew this up a couple of months ago as the product detector and audio stages of my 9 band superhet. It should work well as a Direct Conversion receiver for WSPR. Of course it will need some filters. The VFO will be supplied from CLK1 on the QRP Labs U3S kit. 

   
It looks like this in the flesh, so to speak.

  
The wire link is just for testing. It links out the volume potentiometer. A tiny audio input signal sounds really loud on a decent 4″ speaker. Its quite noise free with no input connected.

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