I would still like the Texas Twang, even if you have to use a 4 position Rotary, it doesn't need the Voltage converter!!!I believe this is basically a silicon Range Master with switchable input coupling cap.
The Range Finder PCB is almost the same thing, except it's germanium and has an 8 position rotary (instead of 3 in the Texas Twang).
Here is my build report :Wow! That definitely nailed it.