Gang,
We have added two bare boards for use with our PTO. While I was working on designing the PTO, I used the Norcal Tin Ear circuit for the testing. I have some of these 40m receiver boards available for anyone that wants to experiment with a PTO.
We also have an option 2 to the prototype PTO project. It is a 4.25" sq. board that uses only the TinEar oscillator with 375 pads for your design and expansion. All the power and I/O connections are contained on the board.
Either bard board is available for $12 w/free conus delivery. Both options are described at:
https://qrpbuilder.com/pto-test-bed
Ken - wa4mnt
