Re: [LAD] You couldn't make it up

[Jonathan E. Brickman]

I was afraid it would be too good the be true :(

You're quite right that the linearity needs to be good and at high gain,
however I'd be inclined to use a passive 20dB per step attenuator on the front
to maintain a good overload margin.


Ah.  Indeed, 384 kHz output is now not expensive at all (probably the 
sound system for my next BNR build, though I'll use 96 kHz of it max), 
but 384 kHz input is still usually about US$1500 and up. I did find one 
for US$600:


https://www.amazon.com/Singxer-Digital-Interface-Femtosecond-Interfaces/dp/B07M72XCZX/ref=sr_1_fkmr0_4?ie=UTF8=1547205969=8-4-fkmr0=384khz+record


--

Jonathan E. Brickman j...@ponderworthy.com  
   (785)233-9977
Hear us at ponderworthy.com  -- CDs and MP3 
available! 

Music of compassion; fire, and life!!!

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Re: [LAD] You couldn't make it up

[Will J Godfrey]

On Tue, 8 Jan 2019 09:00:16 -0800 (PST)
Len Ovens  wrote:

>On Mon, 7 Jan 2019, Jonathan E. Brickman wrote:
>
>> How about 32bit with 384kHz sampling?  Boxes like these are starting to 
>> spring
>> up. 
>> 
>> https://www.amazon.com/GUSTARD-U12-384KHz-Digital-Interface/dp/B00PU3R6KY  
>
>That box is output only. That seems to be quite common that is there 
>is a consummer interest for output boxes but only niche interest for input 
>or i/o boxes. Input boxes of good quality will cost more as it is easy to 
>build the low gain output analog circuitry but much harder to build high 
>gain, high quality, linear, controlable (with accuracy) input circuitry. 
>For a scope, knowing the exact level at each gain position is pretty 
>important.
>
>--
>Len Ovens
>www.ovenwerks.net

I was afraid it would be too good the be true :(

You're quite right that the linearity needs to be good and at high gain,
however I'd be inclined to use a passive 20dB per step attenuator on the front
to maintain a good overload margin.

-- 
It wasn't me! (Well actually, it probably was)

... the hard part is not dodging what life throws at you,
but trying to catch the good bits.
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Re: [LAD] You couldn't make it up

[Len Ovens]

On Mon, 7 Jan 2019, Jonathan E. Brickman wrote:


How about 32bit with 384kHz sampling?  Boxes like these are starting to spring
up. 

https://www.amazon.com/GUSTARD-U12-384KHz-Digital-Interface/dp/B00PU3R6KY


That box is output only. That seems to be quite common that is there 
is a consummer interest for output boxes but only niche interest for input 
or i/o boxes. Input boxes of good quality will cost more as it is easy to 
build the low gain output analog circuitry but much harder to build high 
gain, high quality, linear, controlable (with accuracy) input circuitry. 
For a scope, knowing the exact level at each gain position is pretty 
important.


--
Len Ovens
www.ovenwerks.net
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Re: [LAD] You couldn't make it up

[Jonathan E. Brickman]

On 11/30/18 5:11 PM, Will Godfrey wrote:


I've just read an item on "The Register" about a network connected high
performance oscilloscope... with no security. That's as in Zero, None, Keine.

That might not seem a big deal, except that this sort of kit tends to reside in
research labs, so evilCorp (tm) could snoop on what a competitor is working on,
and pretty quickly work out not only what it is, but how well it's performing.
Said evilCorp could then plant some nasty that casually looks around to see
what other kit is on the network. Presumably this also potentially opens a door
to sabotage.

Anyway, that got me thinking (yes I know)

Has anyone thought of connecting an AD converter to a Raspberry Pi to make a
high resolution, but comparatively low bandwidth oscilloscope for audio work?
Say 16bit 500k. I'm thinking it could possibly be connected via I2C or SPI,
both of which are supported on the Pi...
or even {cough} ethernet {cough}

BTW I'm not talking about connecting to bitscope - that only has 8bit resolution
and the module itself has no gain control and is easily overloaded :(


How about 32bit with 384kHz sampling?  Boxes like these are starting to 
spring up.


https://www.amazon.com/GUSTARD-U12-384KHz-Digital-Interface/dp/B00PU3R6KY

Might be an interesting challenge to find (or help write) the code to 
make it work -- I don't know anyone actually advertising that their ALSA 
or JACK code is very good for that high a sampling rate -- but most of 
it should already be there, I think?


--

Jonathan E. Brickman j...@ponderworthy.com  
   (785)233-9977
Hear us at ponderworthy.com  -- CDs and MP3 
available! 

Music of compassion; fire, and life!!!

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[LAD] You couldn't make it up

[Will Godfrey]

I've just read an item on "The Register" about a network connected high
performance oscilloscope... with no security. That's as in Zero, None, Keine.

That might not seem a big deal, except that this sort of kit tends to reside in
research labs, so evilCorp (tm) could snoop on what a competitor is working on,
and pretty quickly work out not only what it is, but how well it's performing.
Said evilCorp could then plant some nasty that casually looks around to see
what other kit is on the network. Presumably this also potentially opens a door
to sabotage.

Anyway, that got me thinking (yes I know)

Has anyone thought of connecting an AD converter to a Raspberry Pi to make a
high resolution, but comparatively low bandwidth oscilloscope for audio work?
Say 16bit 500k. I'm thinking it could possibly be connected via I2C or SPI,
both of which are supported on the Pi...
or even {cough} ethernet {cough}

BTW I'm not talking about connecting to bitscope - that only has 8bit resolution
and the module itself has no gain control and is easily overloaded :(

-- 
Will J Godfrey
http://www.musically.me.uk
Say you have a poem and I have a tune.
Exchange them and we can both have a poem, a tune, and a song.
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