Saw one more design today and is available in Kit form also 34 USD
73's
Nitin [VU3TYG]
From: Dev Ramaprabhu <vu2dev@yahoo.com>
To: HamBrewers@yahoogroups.com
Sent: Monday, 26 December 2011 3:32 PM
Subject: Re: [HamBrewers] Re: Required- Noise reduction circuits for speaker
| Dear Rajesh, Tks a lot and it does work! 73, dev --- On Sun, 12/25/11, Nitin Muttin <vu3tyg@yahoo.co.in> wrote:
From: Nitin Muttin <vu3tyg@yahoo.co.in>
Subject: Re: [HamBrewers] Re: Required- Noise reduction circuits for speaker
To: "HamBrewers@yahoogroups.com" <HamBrewers@yahoogroups.com>
Date: Sunday, December 25, 2011, 1:39 PM
Hi Rajesh,
Thanks, currently suing the same on the external speaker and it helps to a certain extent.
73's Nitin [VU3TYG]
From: Rajesh K <kc2kby@airtelmail.in>
To: HamBrewers@yahoogroups.com
Sent: Sunday, 25 December 2011 1:26 PM
Subject: RE: [HamBrewers] Re: Required- Noise reduction circuits for speaker [1 Attachment]
Nitin, You could try this one also(A $1.00 Noise Reducing Speaker in the attached newsletter). I have homebrewed a speaker for my IC-718 and got some improvement. 73 Raj VU3RGK From: HamBrewers@yahoogroups.com [mailto:HamBrewers@yahoogroups.com] On Behalf Of vu3tyg
Sent: Saturday, December 24, 2011 11:39 PM
To: HamBrewers@yahoogroups.com
Subject: [HamBrewers] Re: Required- Noise reduction circuits for speaker Thanks Yan for the information, will try your suggestion 73's and HNYNitin [VU3TYG]--- In HamBrewers@yahoogroups.com, "Yannick (XV4Y)" <yannick.devos@...> wrote:>> Hi Nitin,> > This circuit works great as Audio LP filter. I use it in my Bitx20 with great results.> Filtering high frequencies spikes it also reduce the need for an AGC.> http://lpistor.chez-alice.fr/filtrebf.htm> > Try to look for circuit using MAX293 or similar (MAX291 or 292 use Butterworh or Bessel, not elliptic filters), you will find a lot on internet.> Some also includes an active HP filter built around an OP-Amp.> > Sometime this kind of filter is called SCAF.> > 73 and HNY,> Yan.> ---> Yannick DEVOS - XV4Y> http://xv4y.radioclub.asia/> http://varc.radioclub.asia/> http://www.qslwatch.com/> > Le 22 déc. 2011 à 23:19, Nitin Muttin a écrit :> > > > > > > Has anyone got any simple noise cancelling circuits either dsp or otherwise which would remove the high tones on ssb reception, this includes the background radio noise. I understand that there was an article in the QST November 2011 issue.> > > > 73's> > Nitin [VU3TYG]> > > > > >>
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