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SM0VPO's COLLECTION OF QRP FILES
K4ICY's Home Brew CW Audio Filter
Index 5 - Filter Circuit - Basic Circuit - Circuit Diagram - SeekIC.com
CW AUDIO FILTER SHOWCASE - QRQcw
Passive LC CW audio filter
Index 11 - Filter Circuit - Basic Circuit - Circuit Diagram - SeekIC.com
Audio CW-Filter NM0S/4SQRP