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googlyone googlyone is offline

diyAudio Member

About Me

  • About googlyone
    Biography
    Electronics engineer, worked on digital, RF, systems engineering, software. Now in management :(
    Location
    Adelaide, South Australia
    Interests
    Strong interest in electronics, particularly analog, power audio and DSP. Hands on, try it out type
    Occupation
    Operations Manager in product design and manufacturing company
    Country
    Australia
    Real Name
    Phil

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General Information
  • Last Activity: Yesterday 04:55 PM
  • Join Date: 7th November 2006

Blog

View googlyone's BlogRecent Entries
Latest Blog Entry

Posted 5th January 2016 at 11:48 AM by googlyone Comments 1
Posted in Uncategorized
I have been asked for the CAD files for the distortion meter I recently built.

NOTE 10 Jan 2016 : I have changed the clock driving and distribution PCB as it really needed to be more versatile to me to run a mix of CS and AKM ADC and DACs. The change allows selection of MCLK at different multiples on the ADC and DAC via jumpers on the board. Again this is prpobably a bit more "hard wired" than a generic consumer device would be, but allows stable operation for fixed sample rate systems.

WARNING:
This project is not a super straight forward "chuck it together and it will all be fine" sort of build. I am providing what is essentially a collection of USB interface (MiniDSP), power supply (mine - open source), backplane, clocking and galvanic isolation (mine - open source), A/D and D/A (mine - open source) and a differential interface and attenuator (Silicon Chip magazine), though I am strongly tempted to do my own.

...

Posted 15th November 2015 at 09:05 AM by googlyone Comments 4
Posted in Uncategorized
I have more or less completed the audio analyser based on CS4398 and CS5381.

In an earlier post I suggested I had reached the limits of these IC's. I was wrong. What I had reached the limit of was getting the grounding "OK" for a single (unbalanced) input measurement system.

I have since built a balanced front end - in fact I simply built a Silicon Chip PCB as it was pretty well what I would do - and integrated this to the ADC and DAC.

It looks a bit like this:

Attachment 1756

What you see is:
- On the left are two independent power supplies
- In the back middle is a MiniDSP USB Streamer card.
- In the middle back is an interface card that
- Does optical isolation of the MiniDsp USB Streamer
- Does more regulation for the ADC and DACs
- Generates local clocks for the DAC and ADC
- Feeds these back to the MiniDSP Streamer
...

Posted 11th October 2015 at 01:10 PM by googlyone Comments 0
Posted in Uncategorized
I have been asked for the PCB file for the weller WPS80 like soldering station driver.

This is rock solid stable - have been using it for quite a long while now with zero issues.

The files are attached, in ALTIUM format.

Attachment 1743

Any questions just ask.

Posted 7th September 2015 at 12:35 PM by googlyone Comments 0
Posted in Uncategorized
On thinking over the sensitivity of the CS5381 to the drive and input filtering capacitor I decided to explore the capacitors further.

I was also interested to note that a number of manufacturers seem to recommend a range of different capacitor values here.

Purely because it was handy - i.e. right in front of me on the desk - I threw an extra 2nF capacitor across the differential input of the CS5381. Boom - the distortion dropped 6dB straight off.

I muttered a few choice profanities, which made me feel an awful lot better, then arbitrarily threw a 470pf NPO ceramic cap across that lot, just to be sure. Well given I was off doing such arbitrary things - why not?

On analysis, 5nF capacitance at 20kHz is about 1.5K Ohms (reactive) which is within the capability of the op amp to drive.

The results?

Attachment 1710

Which I found rather pleasing, as using the "default" 2n7,...

Posted 6th September 2015 at 12:47 PM by googlyone Comments 0
Posted in Uncategorized
I have had the time to play with the MiniDSP Streamer and my ADC and DACs now.

Initial results were disappointing - and led to me looking very closely at the ADC drive, and particularly the single ended to differential part of the circuit.

Given I pinched this circuit from an application note (and embarrassingly did not question it adequately) gives me little solace that I built, and used this!

Interestingly, Creative Labs did exactly the same thing on the sound blaster that I had so much trouble improving - the single ended conversion is just wrong. This solves the "Puzzle" that I noted in a blog a few months ago - now I know why I just couldn't get better performance out of that CS5381 drop in to the Sound blaster box.

In the process of improving the ADC drive, and to allow experimentation with the input op amps, I built two versions of the ADC drive, one using non inverting buffers and a second that uses inverting...
Recent Comments
Hard core as usual G1!...
Posted 31st January 2016 at 08:49 PM by wintermute wintermute is offline
Tolik,
I will...
Posted 25th December 2015 at 04:28 AM by googlyone googlyone is offline
Hello, googlyone ...
Posted 19th December 2015 at 07:56 PM by Tolik Tolik is offline
Tony,
I don't...
Posted 11th December 2015 at 08:43 AM by googlyone googlyone is offline
Nice work!! I have a...
Posted 9th December 2015 at 02:04 AM by wintermute wintermute is offline
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