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Old 18th August 2020, 07:41 PM   #5871
John Luckins is offline John Luckins  Europe
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Join Date: Jul 2009
Location: Northants UK
Quote:
Originally Posted by Mikett View Post
John can you show us the innards of the SGD1 and what mods have been done.
Always interesting to see what is possible.
Sure, when I get a chance in the next day or two...

John
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Old 18th August 2020, 10:22 PM   #5872
rfbrw is offline rfbrw
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Quote:
Originally Posted by Markw4 View Post
Some of the people who want to use alternate circuits are not EEs.
And some of those fall into the camp that think datasheets are no more than a serving suggestion and are sure they know better.
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Old 19th August 2020, 03:16 AM   #5873
Terry Demol is offline Terry Demol  Australia
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Quote:
Originally Posted by syn08 View Post
Not all EEs are designers and not all designers are EEs. About those that don't even have a scope, they should probably look for another hobby.

If you spotted any name calling and derisive language above, please quote. When I was a beginner I was looking forward to learning from proven qualified people. And I purchased a scope to start with, that was lesson zero.
WRT scope, 100% agree. The amount of time that gets wasted here trying
to help people only to find they haven't got a scope can be frustrating. When
I was young they were expensive, these days you can pick up a 50MHz for
very cheap, there's no excuse, especially for digital audio projects.

Without one you are flying blind and have no clue what is going on.

TCD
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Old 21st August 2020, 09:27 AM   #5874
Markw4 is offline Markw4  United States
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Quote:
Originally Posted by Green77 View Post
Thanks,
As you say Mark, TL431 is avalible.
Hi Daniel,
Hopefully, all the recent talk about the usefulness of having a scope have not dissuaded you from continuing to try to find a way to work on a dac. Some people have successfully performed extensive mods to Chinese dac boards without having a scope.

Its true that the price of pretty good scopes has come down drastically from what they once cost, but they still aren't necessarily something everyone in the world is able to afford right now.
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Old 25th August 2020, 10:06 AM   #5875
Green77 is offline Green77  Sweden
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Join Date: May 2007
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Hello,

I took the advice and picked up a used small lcd scoop.
I know that is it cheap model from China, But it seems to work anyway.
I haven’t had the time do any diy on the Dac, more then to test the scoop om the digital and signals and test it on a 1000Hz sinus out from the Dac.

BR// Daniel
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Old 25th August 2020, 11:44 AM   #5876
Markw4 is offline Markw4  United States
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Join Date: Jul 2016
Location: California
Hi Daniel,
Which scope did you get? Do you have a pic or a link to one so we can see what it looks like?
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Old 27th August 2020, 05:39 AM   #5877
Green77 is offline Green77  Sweden
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Hello,

Sorry for late reply, i was out of town..

It is a cheap one, got it for free from a friend.. so used and abused but seems to work to "see" the digital signals and a analoge sinus at output when sending a 1000hz digital in at dac.

[IMG]Click the image to open in full size.[/IMG]


BR // Daniel

Last edited by Green77; 27th August 2020 at 05:42 AM.
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Old 27th August 2020, 11:24 AM   #5878
Markw4 is offline Markw4  United States
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Hi Daniel,
Can't tell from the pic if it has 1 or 2 input channels, nor what the rated bandwidth is. Maybe you can tell us if it has one or two input connectors? Also, looks like the display says 100MHz. If its really a 100MHz scope that's may be a nice gift someone gave you.

Last edited by Markw4; 27th August 2020 at 11:29 AM.
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Old 27th August 2020, 11:52 AM   #5879
Green77 is offline Green77  Sweden
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Hi,

Just one input and max 40Mhz.
Anyway, i have ordered parts to build 3.3v to AVCC with a Lme47920.
And will separate some 3.3v with my small regulators over from another Dac.
I also did a cheap PCB for the output stage. Will arravie during next week I hope. Quick and dirty, so won’t preforme as textbook but but..

BR // Daniel
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Old 27th August 2020, 05:37 PM   #5880
Green77 is offline Green77  Sweden
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Join Date: May 2007
Location: MJOLBY
Pcb uses schematic from Mr.Slim in post #3003.
Can be some errors and like I sař alot of designerrors like groundplane, supplylines etc.. And due to some problems to collect parts from local supplyer the choice of components can look a bit strange…

Click the image to open in full size.
Click the image to open in full size.

BR //Daniel
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