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'Suggestions for a Voltage controlled amplifier of '
1999\11\07@174801 by Mathew Cohen

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Hi,

Could you nice people suggest a good voltage controlled amp chip (audio) for
4 channels or a matrix switcher with cross point attenuation 9 (chip). This
is to be used with a 16f84.
I think it is obvious what I am trying to achieve if anyone has another way
of attenuating 4 channels of audio (with 2 channels that can be swiched to
Mic level) please let me know.

Thanks in advance
Mathew Cohen

1999\11\07@181254 by Jinx

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Hi, if you want volume control, could I suggest the MC3340 VCA, which
works OK with an RC on the control i/p fed with pulses from the PIC. If
you can't tie up the PIC with pulse generation how about using it enable
555 oscillators. For on/off just a fairly simple arrangement of 4066s.

Jinx

> Could you nice people suggest a good voltage controlled amp chip
> (audio) for 4 channels or a matrix switcher with cross point attenuation
> 9 (chip). This is to be used with a 16f84.

1999\11\07@222758 by Kelly J Kohls

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Mathew,

> Could you nice people suggest a good voltage controlled amp chip
> (audio) for

Some possibilities are:

Analog Devices SSM-2018T (single channel VCA)

That Corporation 2180 (single channel VCA)

Crystal Semiconductor CS3310 (two channel digital volume control)


The Crystal part can be interfaced directly to a PIC.  The two VCA's have
analog control ports and will require some sort of D/A conversion to
interface to a PIC.


Kelly Kohls, N5TLE
Dallas, TX
Email:  spam_OUTkkohlsTakeThisOuTspamjuno.com  OR  .....n5tleKILLspamspam@spam@qsl.net
Homepage:  http://www.qsl.net/n5tle/

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1999\11\07@234728 by Keith Causey

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Maxim will sample multiplying DAC's in resolutions as high as 14-bit. To use
a DAC as a VCA send your signal to the DAC's Vref input. The Vref input will
be scaled with the binary word sent by the microcontroller and routed to
Vout. External amplification will be needed to drive speakers. National
Semiconductor will sample  audio amplifier chips with up to 68 watts power
handling capability that will probably work fine. The price is right.
Good Luck - Keith Causey

{Quote hidden}

1999\11\08@031819 by Michael Rigby-Jones

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part 0 3072 bytes
<P><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">Analog Devices do a very nice range of audio mixer ICs, which will handle up to 8 stereo channels, all controlled by a SPI type bus.</FONT></P>

<P><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">Have a look at<U> <A HREF="http://products.analog.com/products_html/list_gen_186_2_1.html" TARGET="_blank">products.analog.com/products_html/list_gen_186_2_1.html</A></U></FONT>
</P>

<P><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">Hope it works for you, I kept geting an ODBC error, but that may well be my very tired windows installation.</FONT>
</P>

<P><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">Regards</FONT>
</P>

<P><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">Mike Rigby-Jones</FONT>
</P>
<UL>
<P><FONT SIZE=1 FACE="Arial">{Original Message removed}

1999\11\08@032441 by David Duffy

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<x-flowed>Mathew Cohen wrote:
> Could you nice people suggest a good voltage controlled amp chip (audio) for
> 4 channels or a matrix switcher with cross point attenuation 9 (chip). This
> is to be used with a 16f84.
> I think it is obvious what I am trying to achieve if anyone has another way
> of attenuating 4 channels of audio (with 2 channels that can be swiched to
> Mic level) please let me know.

AD have the SSM2163 4/8 way volume control.
NS have the LM1971 / LM1972 / LM1973 series.
I've used both of these before - SPI interface IIRC.
Regards...

_______________________________________________________________
Dave Duffy         Audio Visual Devices           EraseMEAVDspam_OUTspamTakeThisOuTuq.net.au
Unit 8, 9-11 Trade Street, Cleveland, Queensland 4163 Australia
Phone: +61 7 38210362                 Facsimile: +61 7 38210281
_______________________________________________________________

</x-flowed>

1999\11\08@095112 by The Old Crow

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On Mon, 8 Nov 1999, Mathew Cohen wrote:

> Could you nice people suggest a good voltage controlled amp chip (audio) for
> 4 channels or a matrix switcher with cross point attenuation 9 (chip). This
> is to be used with a 16f84.

 Either 1) buy some CEM3330 dual VCA chips from Paul at
http://www.synthtech.com, or go to someplace like http://www.synthfool.com and look at
schematics of OTA-based VCAs.

--Crow

/**/

1999\11\08@142803 by l.allen

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> Mathew Cohen wrote:
>  > Could you nice people suggest a good voltage controlled amp chip (audio) fo
r
>  > 4 channels or a matrix switcher with cross point attenuation 9 (chip). This
>  > is to be used with a 16f84.
>  > I think it is obvious what I am trying to achieve if anyone has another way
>  > of attenuating 4 channels of audio (with 2 channels that can be swiched to
>  > Mic level) please let me know.
>

I have used the quad VCA made by Analog Devices SM2164 for dynamic
audio routing(Dolby Surround), works well.
For simple digital volume control I have used the National LM1972,
its only dual but the attn steps are known and there is a handy mute
command.
_____________________________

Lance Allen
Technical Officer
Uni of Auckland
Psych Dept
New Zealand

http://www.psych.auckland.ac.nz

_____________________________

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