Sunday, December 25, 2011

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.shtml

73,
Yan.
---
Yannick DEVOS - XV4Y
http://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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