I just received yesterday from my friendly group of ELEKITSORPARTS, a small and smart group of amateur radio components designer and builder, the ADSP Filter FDS-02. They sent to me, for testing and review purpose, this small and effective audio filter that do more than just filtering!
Meanwhile, you can visit their website at http://www.elekitsorparts.com
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Have a great summer and stay tuned!
Jeff | VA2SS