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QRPGuys Active 600Hz Audio Filter - QRPGuys
https://qrpguys.com/qrpguys-active-600hz-audio-filter
QRPGuys Active 600Hz Audio Filter This product has been retired. Bare board only available – $10, Go here to order Your PayPal receipt is your confirmation that we have received your order. Stock availability and shipping volume can delay …
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.
The NEScaf Story – QRP Club of New England
https://www.newenglandqrp.org/nescaf-a-switched-capacitor-audio-filter/
The NEScaf is a switched capacitive audio filter. It is designed to be simple to build and use. It is more flexible than previous filters for QRP rigs. It has two panel-mounted controls — a single center-detent potentiometer that sets the center frequency of the filter’s bandpass (default value settable between ~415Hz and ~1kHz), and a dual ...
5 Band CW QRP Transceiver Phasing Audio Filter and ...
https://g4tgj.github.io/5-Band-CW-QRP-Transceiver-Phasing-Audio-Board/
Part of the 5 band transceiver. The phasing audio filter and amplifier board is the final board required to build the receiver. It takes the in-phase (I) and quadrature (Q) audio from the direct conversion receiver block and applies a 90 degree phase shift to cancel the image, sends it through a 200Hz CW filter and amplifies it for headphones.
Four State QRP Group
http://www.4sqrp.com/HiPerMite.php
Four States QRP Group. Specifications and Design Features Bandwidth: 200 cycles at the -3 DB bandwith points. Center Frequency: The center frequency in the passband is 700 HZ Signal Gain: 0 dB to 50 dB, user selectable No Ringing or Buzz: Nice, smooth audio - care has been taken in the design to eliminate ringing. Versatile: Drives speaker, earbuds, or headphones.
The magical audio filter refined by sv3ora - qrp.gr
The magical audio filter refined. and adapted for the Yaesu FT-301. by sv3ora. On the November 1983 issue of QST, Jim Pepper W6QIF has released the " Magical audio filter ". By reading at the article, it seemed suitable as a companion AF filter for my Yaesu FT-301. This circuit, while not the sharpest filter possible, offers quite a lot of ...
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