Now I've finished the Audio CW-filter I've decribed here in details.

 

I've placed the filterboard into a small aluminium case from FISCHERDSCF4261.

To fasten the board in the case, I simple use a carrier-board formed by an old piece of PCB and two nylon stand-offs. DSCF4262

It now forms a neat audio cw filter-/amplifier-box which fits perfectly to my Frog Sounds QRP transceiver. DSCF4265

2014 CW (Morse Telegraphy) was added to the German Nationwide Inventory of Intangible Cultural Heritage.

Logo