[Sursound] 8 channels on 12 volts

[umashankar manthravadi]

dear all
there have been  recent discussions on multichannel amplifiers. this is my 
solution. two cards providing 8 channels of amplification running on a lithium 
12 volt battery ! (very low cost too, on aliexpress 
http://www.aliexpress.com/item/Free-Shipping-Amplifier-Board-TDA7850-4X50W-4-Channel-Car-Audio-Amplifier-Board-12V-AV-Interface/1331622462.html.
i have not powered it up yet
umashankar
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Re: [Sursound] 8 channels on 12 volts

[Augustine Leudar]

Ooooh for me this is very interesting. Let us know how long it lasts for.
Let us know what material and what speakers ! What are you using this for ?

On Saturday, 31 October 2015, umashankar manthravadi <umasha...@hotmail.com>
wrote:

> dear all
> there have been  recent discussions on multichannel amplifiers. this is my
> solution. two cards providing 8 channels of amplification running on a
> lithium 12 volt battery ! (very low cost too, on aliexpress
> http://www.aliexpress.com/item/Free-Shipping-Amplifier-Board-TDA7850-4X50W-4-Channel-Car-Audio-Amplifier-Board-12V-AV-Interface/1331622462.html
> .
> i have not powered it up yet
> umashankar
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> >
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Re: [Sursound] 8 channels on 12 volts

[umashankar manthravadi]

my first use is to power a dodecahedron loudspeaker-three speakers to each 
amplifier. that way i will get more power out of 12 volts. i just finished 
3dprinting the loudspeaker.

i will build a portable 8 channel system with 3-inch speakers that i would like 
to take around for ambisonic demonstrations in colleges etc.

i should check the specs for the ic.it is a single chip and the board looks 
well made - it says 50 watts per channel, but i would be happy with about 
18watts into 4 ohms per channel. (it should be capable of that much - these are 
bridge outputs.

umashankar

> Date: Sat, 31 Oct 2015 10:42:43 +
> From: augustineleu...@gmail.com
> To: sursound@music.vt.edu
> Subject: Re: [Sursound] 8 channels on 12 volts
> 
> Ooooh for me this is very interesting. Let us know how long it lasts for.
> Let us know what material and what speakers ! What are you using this for ?
> 
> On Saturday, 31 October 2015, umashankar manthravadi <umasha...@hotmail.com>
> wrote:
> 
> > dear all
> > there have been  recent discussions on multichannel amplifiers. this is my
> > solution. two cards providing 8 channels of amplification running on a
> > lithium 12 volt battery ! (very low cost too, on aliexpress
> > http://www.aliexpress.com/item/Free-Shipping-Amplifier-Board-TDA7850-4X50W-4-Channel-Car-Audio-Amplifier-Board-12V-AV-Interface/1331622462.html
> > .
> > i have not powered it up yet
> > umashankar
> > -- next part --
> > An HTML attachment was scrubbed...
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> > https://mail.music.vt.edu/mailman/private/sursound/attachments/20151031/aba8d359/attachment.html
> > >
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> > Size: 1430143 bytes
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> > URL: <
> > https://mail.music.vt.edu/mailman/private/sursound/attachments/20151031/aba8d359/attachment.jpg
> > >
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> >
> 
> 
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Re: [Sursound] SQ QUAD

[Dave Malham]

That makes sense. Thanks.

   Dave

On 31 October 2015 at 16:50, Geoffrey Barton <geoffreybar...@mac.com> wrote:

> >
> > Message: 4
> > Date: Fri, 30 Oct 2015 16:24:23 +
> > From: Dave Malham <dave.mal...@york.ac.uk>
> > To: Surround Sound discussion group <sursound@music.vt.edu>
> > Subject: Re: [Sursound] Sursound Digest, Vol 87, Issue 20
> > Message-ID:
> ><CAPw+1zRuVrE1soXPG7S=qxtsutdd4nv2ogaudg6-_lxj3rt...@mail.gmail.com>
> > Content-Type: text/plain; charset="utf-8"
> >
> > Well, I tracked down at least one source for my memory - the pdf of what
> is
> > claimed to be the"original design documents" for the Minim AD7, which can
> > be found here - https://sites.google.com/site/minimdecoders/
> > Not that it tells you much - just a section (on page 9) on what you can
> > expect out of a "Variable Preference Decoder" for "Normal UHJ", "Fwd UHJ"
>
> that's 'variable preference', which is the Minim pro design (I forget the
> number) and the A+D design. Not 'variable  directional preference'
>
> > and "Bkwrd UHJ" In fact, this doesn't seem to relate to the design
> > presented - maybe it was included in the scan accidentally.
>
> I gave Martin that part as the bottom of the page refers to the AD7 design.
>
> Geoffrey
> >
> >
> > 
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>



-- 

As of 1st October 2012, I have retired from the University.

These are my own views and may or may not be shared by the University

Dave Malham
Honorary Fellow, Department of Music
The University of York
York YO10 5DD
UK

'Ambisonics - Component Imaging for Audio'
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Re: [Sursound] SQ QUAD

[Dave Malham]

That was a rather expensive mistake of the student, putting 240v onto the
5v rail on that, then :-)

 Dave

On 31 October 2015 at 17:00, Geoffrey Barton <geoffreybar...@mac.com> wrote:

> >>
> > Message: 5
> > Date: Fri, 30 Oct 2015 16:40:08 +
> > From: Dave Malham <dave.mal...@york.ac.uk>
> > To: Surround Sound discussion group <sursound@music.vt.edu>
> > Subject: Re: [Sursound] SQ QUAD
> > Message-ID:
> ><CAPw+1zT+_E1JbYX4q+5nELsSLOugKm=4pfqbg6atybzgu1u...@mail.gmail.com>
> > Content-Type: text/plain; charset="utf-8"
> >
> > Kind of thought it might be that - purely manual,
>
> no
>
> > or was there any signal
> > dependent stuff going on?
>
> Very much so, it was a multiband design with much detection logic and
> VCAs. It took up a half width rack box, 7 or 8 boards as I recall.
>
> Geoffrey
> >
> >
> > 
> ___
> Sursound mailing list
> Sursound@music.vt.edu
> https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here,
> edit account or options, view archives and so on.
>



-- 

As of 1st October 2012, I have retired from the University.

These are my own views and may or may not be shared by the University

Dave Malham
Honorary Fellow, Department of Music
The University of York
York YO10 5DD
UK

'Ambisonics - Component Imaging for Audio'
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Re: [Sursound] 8 channels on 12 volts

[Augustine Leudar]

Fantastic ! What sort of 3d printer did you use or was it a router ? Your
own design of speaker ?

On Saturday, 31 October 2015, umashankar manthravadi <umasha...@hotmail.com>
wrote:

> my first use is to power a dodecahedron loudspeaker-three speakers to each
> amplifier. that way i will get more power out of 12 volts. i just finished
> 3dprinting the loudspeaker.
>
> i will build a portable 8 channel system with 3-inch speakers that i would
> like to take around for ambisonic demonstrations in colleges etc.
>
> i should check the specs for the ic.it is a single chip and the board
> looks well made - it says 50 watts per channel, but i would be happy with
> about 18watts into 4 ohms per channel. (it should be capable of that much -
> these are bridge outputs.
>
> umashankar
>
> > Date: Sat, 31 Oct 2015 10:42:43 +
> > From: augustineleu...@gmail.com <javascript:;>
> > To: sursound@music.vt.edu <javascript:;>
> > Subject: Re: [Sursound] 8 channels on 12 volts
> >
> > Ooooh for me this is very interesting. Let us know how long it lasts for.
> > Let us know what material and what speakers ! What are you using this
> for ?
> >
> > On Saturday, 31 October 2015, umashankar manthravadi <
> umasha...@hotmail.com <javascript:;>>
> > wrote:
> >
> > > dear all
> > > there have been  recent discussions on multichannel amplifiers. this
> is my
> > > solution. two cards providing 8 channels of amplification running on a
> > > lithium 12 volt battery ! (very low cost too, on aliexpress
> > >
> http://www.aliexpress.com/item/Free-Shipping-Amplifier-Board-TDA7850-4X50W-4-Channel-Car-Audio-Amplifier-Board-12V-AV-Interface/1331622462.html
> > > .
> > > i have not powered it up yet
> > > umashankar
> > > -- next part --
> > > An HTML attachment was scrubbed...
> > > URL: <
> > >
> https://mail.music.vt.edu/mailman/private/sursound/attachments/20151031/aba8d359/attachment.html
> > > >
> > > ------ next part --
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> > >
> https://mail.music.vt.edu/mailman/private/sursound/attachments/20151031/aba8d359/attachment.jpg
> > > >
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> > > Sursound@music.vt.edu <javascript:;> <javascript:;>
> > > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe
> here,
> > > edit account or options, view archives and so on.
> > >
> >
> >
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Re: [Sursound] SQ QUAD

[Geoffrey Barton]

> 
> Message: 4
> Date: Fri, 30 Oct 2015 16:24:23 +
> From: Dave Malham <dave.mal...@york.ac.uk>
> To: Surround Sound discussion group <sursound@music.vt.edu>
> Subject: Re: [Sursound] Sursound Digest, Vol 87, Issue 20
> Message-ID:
><CAPw+1zRuVrE1soXPG7S=qxtsutdd4nv2ogaudg6-_lxj3rt...@mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
> 
> Well, I tracked down at least one source for my memory - the pdf of what is
> claimed to be the"original design documents" for the Minim AD7, which can
> be found here - https://sites.google.com/site/minimdecoders/
> Not that it tells you much - just a section (on page 9) on what you can
> expect out of a "Variable Preference Decoder" for "Normal UHJ", "Fwd UHJ"

that's 'variable preference', which is the Minim pro design (I forget the 
number) and the A+D design. Not 'variable  directional preference'

> and "Bkwrd UHJ" In fact, this doesn't seem to relate to the design
> presented - maybe it was included in the scan accidentally.

I gave Martin that part as the bottom of the page refers to the AD7 design.

Geoffrey
> 
> 
> 
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Re: [Sursound] SQ QUAD

[Geoffrey Barton]

>> 
> Message: 5
> Date: Fri, 30 Oct 2015 16:40:08 +
> From: Dave Malham 
> To: Surround Sound discussion group 
> Subject: Re: [Sursound] SQ QUAD
> Message-ID:
>
> Content-Type: text/plain; charset="utf-8"
> 
> Kind of thought it might be that - purely manual,

no

> or was there any signal
> dependent stuff going on?

Very much so, it was a multiband design with much detection logic and VCAs. It 
took up a half width rack box, 7 or 8 boards as I recall.

Geoffrey 
> 
> 
> 
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