View Single Post
Old 12th January 2013
  #8
I've seen schematics, pcb's and stuff available on the web if you can solder.
Any hi frequency shelf EQ can be modified into a 40k hz "air band" with usually only one cap change. Just decrease the value about 3 or 4 times from the stock value if it's set to 10k hz. Mount a switch and you too can change frequencies.