I need good schematic of audio noise reduction filter (for my home-made HF
transceiver). I tried with many of diferent DSP filter softwares, but they
have some delay which made problems during contests.

So, if someone can help me with good schematic of noise reduction filter, I
will be grateful.

(More preferable schematic without DSP IC's, because I have problem to bay
them in my country).

Best regards,

73 de Djole,
YZ1GW