[CW] NEScaf switched capacitive audio filter

[Petr Ourednik]

Hi all,

as Mike wrote I can confirm it is great feature for your rig. I tested few of them and
after proper building it run for the first shot and works like champ. 
You will be amazed with the improvement of your radio using the NESCAF box.

73 - Petr, OK1RP

On Sat, Jun 16, 2018, at 1:54 AM, w9oj at indy.rr.com wrote:
> 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-ganged potentiometer that provides 
> a continuously variable bandwidth control (from ~60Hz to ~1500Hz). This 
> ability to smoothly vary the bandwidth is very useful.
> 
> The NEScaf is designed to be driven with a phones or speaker level 
> signal. No hacking into your rig — just connect it to the headphone or 
> speaker output of the radio. This makes it usable with several radios. 
> The board is small enough, at about 2 inches square, to build inside 
> many radios however, if you so choose.
> 
> 
> http://www.newenglandqrp.org/wordpress/nescaf-a-switched-capacitor-audio-filter/
> 
> 
> 
> 73 de Mike W9OJ
> 
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73 - Petr, OK1RP
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