A Dutch hamradio station in a bookbinding workshop

Hi-Per-Mite cw filter

I ordered the kit at: and waited a while. Then it came in the post delivery. An evening of building fun and I had it working. As an extra I build in a potentiometer. 

After a while I wanted to get rid of the rf coming in the plastic housing so I rebuild the whole thing in aluminum. Much more comfortable.

On my FT-817 it performs great now. A three position switch puts power to the cirquit before switching the filter in the audio output of the rig. This eliminates heavy clicking in my headphones.