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NESCAF Audio Filter - wb0smx.net
http://www.wb0smx.net/?p=1256
The NESCAF audio filter is kitted by the New England QRP Club. Â It is intended to be a CW filter with continuously variable bandwidth from about 90 hz to about 1500 hz. Â The center frequency is adjustable from about 150 hz to about 1000 hz.
NEScafe Audio Filter
http://www.wa0itp.com/nescaf.html
NEScaf Audio Filter. This is a very capable and user friendly switched capacitor audio filter. It is a kit offering from the New England QRP club, and is very reasonably priced at $35. This from their web site: The NEScaf is a switched capacitive audio filter based on the MF100 chip. It is designed to be simple to build and use.
NESCAF – QRP Club of New England
https://www.newenglandqrp.org/nescaf/
We are happy to once again make the New England Switched Capacitor Audio Filter (NESCAF) available to the QRP community. Please be aware that the NESCAF board is approximately 2″ x 2″ (5.08cm x 5.08cm). It’s all through-hole construction, i.e. not a bad build, but we recommend a soldering iron in the 20-30W range. Schematic Build Instructions
NEScaf audio filter - QSL.net
https://www.qsl.net/iw1bco/NEScaf.html
The New England QRP Club NEScaf is a switched capacitive audio filter kit.
The NEScaf Story – QRP Club of New England
https://www.newenglandqrp.org/nescaf-a-switched-capacitor-audio-filter/
The NEScaf is only $38 postpaid in the U.S., including the connector kit, which used to be optional. Theory The integrated circuit at the heart of the NESCaf is made up of two CMOS active filters. These filters are extremely configurable (low pass, band pass, notch etc).
NEScaf Audio Filter - QRZ Forums
https://forums.qrz.com/index.php?threads/nescaf-audio-filter.495486/
The NEScaf kit is just out of stock at present, not discontinued. I suggest you correspond with the New England QRP club to learn when they plan to resume shipping. SCAF audio filters are designed to limit how much of the audio spectrum will …
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