Rahul,
Is this what appeared in the Nov QST. The DSP module itself is 140 USD + other components. I think I will try the ckt suggested by Yan
73's
Nitin [VU3TYG]
From: rahul srivastava <lkorahul@yahoo.com>
To: HamBrewers@yahoogroups.com
Sent: Monday, 26 December 2011 12:11 PM
Subject: Re: [HamBrewers] Re: Required- Noise reduction circuits for speaker
| Hi! Latest issue of QST carries an active DSP speaker project using ready maede module. 73's Rahul VU3WJM --- On Mon, 26/12/11, Yannick (XV4Y) <yannick.devos@online.fr> wrote:
From: Yannick (XV4Y) <yannick.devos@online.fr>
Subject: Re: [HamBrewers] Re: Required- Noise reduction circuits for speaker
To: HamBrewers@yahoogroups.com
Date: Monday, 26 December, 2011, 8:03 AM
Good morning all, I forgot to tell that you can have MAX293 at no cost from Maxim.They sent me samples (two units) when I ask for.They are not able to ship to Viet-Nam so I have to ship to my parent's home in France and then they send it to me.Futurlec have Maxim's IC at a fair price.http://www.futurlec.com/ICMaxim.shtml73,Yan.---Yannick DEVOS - XV4Yhttp://xv4y.radioclub.asia/http://varc.radioclub.asia/http://www.qslwatch.com/Le 25 déc. 2011 à 14:56, Rajesh K a écrit :> [Attachment(s) from Rajesh K included below] > > 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 HNY> Nitin [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]> > > > > > > > >> >> > > Attachment(s) from Rajesh K> > 1 of 1 File(s)> > noise reducing speaker.pdf> >
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