MODIFYING THE W3NQN PASSIVE CW AUDIO FILTER TO INTERFACE WITH YOUR COMPUTER'S SOUND CARD

[Chuck aa0hw]

MODIFYING THE W3NQN PASSIVE CW AUDIO FILTER TO INTERFACE WITH YOUR COMPUTER'S SOUND CARD ARTICLE IS HERE

 

ED, W3NQN. has made a special price offer to sell just the w3nqn parts for this project at ($23 postpaid)

 to anyone interested in building this modified  "iCW - w3nqn"  filter. - see Ed's announcement HERE

NOTE: (you have to supply your own resistors and the one .22 uf capacitor as shown in the modified circuit)

 

TO PURCHASE THE W3NQN PARTS FOR THIS MODIFIED FILTER

YOU CAN PLACE YOUR ORDER AT W3NQN'S WEBSITE HERE

 

Ask for the parts to the iCW-MODIFIED w3nqn passive cw audio filter

 

Here is a picture of the spectrum analysis difference after being filtered by w3nqn's iCW-modified filter:

 

FROM:

 

TO:

 

FROM:

 

TO:

 

WITH THIS:

 

and this circuit modification to the output: