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Home Rigs  Antenna Files The Shack Rig Accessories Test Equipment Portable Operating Miscellaneous My Beliefs Links	NESCAF Accessory Box  The NESCAF from the New England QRP Club is the best SCAF filter I have found.  I added a K6XX CW tuning indicator and an audio amp to make a handy CW rig accessory.  The audio amp started as a Velleman kit, but I improved it based on a TDA2003V audio amp circuit found on the N0SS web site.  Details on the K6XX CW Tune Indicator are available on the N0SS K1 Information Page .