Qrp Tunable Audio Filter | Audio-Digital.net

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Easy Audio Bandpass Filter Kit - QRP Kits

http://www.qrpkits.com/files/AFBPF_Manual_V4_20160707.pdf

The Audio Frequency Band Pass Filter kit from qrpkits.com provides A basic audio filter kit with preamp, op-amp filter and LM386 audio amp to drive headphones or speaker. It has a peak in audio response that is tunable from approximately 300Hz to 2Khz and has a bandwidth

Easy Series - Pacific Antenna - QRP Kits

http://www.qrpkits.com/ezseries.html

A basic audio filter kit with preamp, op-amp filter and LM386 audio amp to drive headphones or speaker Has a peak in response that is tunable from approximately 300Hz to 2Khz Tuning and volume pots for adjustment Build in 1-2 hours or less Designed for use with our Easy RX kits or other radios to add audio filtering

The magical audio filter refined by sv3ora - qrp.gr

http://qrp.gr/tmaf/

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 ...

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 shipping. The QRPGuys Active 600Hz Audio Filter is a fixed 600Hz bandpass […]

AF 1 Elecraft Aktive AF Filter (Kit ) - QRP-Shop

https://www.qrp-shop.biz/AF1

AF 1 Elecraft Aktive AF Filter (Kit ) * Filters: Variable Cutoff Low pass filter (SSB/CW) plus two levels of narrow CW bandpass filtering with tunable center frequency. * Built-in audio amplifier with volume control. * Dimensions: 5-1/2” L x 2-7/8” W x 7/8” H (14 cm x 7.3 cm x 2.2 cm).

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