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Old 29th November 2005, 06:53 AM   #271
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Quote:
Originally posted by ash_dac
Hi,

I was thinking today about these mods to a cd723:-

1. Convert EIAJ to I2S so you can add an I2S dac with the schematic here http://www.diyaudio.com/forums/showt...26#post702826.

2. Add a tda1541a with a transistor output stage (mabe Jocko's easy I/V)

I'm interested to hear what the combination of VAM1201, and tda1541a would sound like.

Has anyone tried this? (obviously not using a digital receiver chip)

Kind regards,

Ashley.
In the thread regarding the Hack for the CD723 you probably missed one point: the hack not only disables (at will) oversampling but also allows IIS output without the need of an external circuit, leaving the choice of the DAC up to you.

Cheers

Andrea
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Old 29th November 2005, 05:41 PM   #272
ash_dac is offline ash_dac  United Kingdom
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Andrea,

Thank you for the information.

Sorry I forgot that with the hack you can select the different digital formats.

Have you interfaced to a tda1541a with I/V ?

I found that the 'father' of the tda1545a device had an ok linearity!

see:- http://www.utdallas.edu/~hellums/doc...SelfCalDAC.pdf

I couldn't understand much of the article!



Kind regards,

Ashley.
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Old 29th November 2005, 06:36 PM   #273
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Hello,
for the moment I didn't try it yet, I just tried the non-oversampling mode (and also 2x) with the stock TDA1545A, but I think it will work with no problems.

Cheers

Andrea
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Old 14th April 2006, 12:48 PM   #274
ash_dac is offline ash_dac  United Kingdom
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Hi,

I tried the AD712 op amp with 1800uf rubycon mbz decoupling . It's a large improvement over the standard op amp.

I also decoupled the vref to the dac with rubycon mbz 1800uf capacitor. This created quited a large improvement.....

Now I guess I need to source that video op amp with high CMR or make a precision low noise vref!
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Old 2nd July 2006, 02:17 PM   #275
Nuuk is offline Nuuk  United Kingdom
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On my site, I have a list of CD723 mods. Somebody has just queried the diagram below with regards to fitting the RLC notch filters to the output.

Click the image to open in full size.

I have not done this mod myself so could somebody tell me if the notch filters do go where the green lines are or do I need to correct this diagram, and if so, how?
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Old 22nd September 2009, 09:57 PM   #276
sigurd is offline sigurd  Belgium
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on the 723 : R3506 must be 10K - R3507 must be 15K : Vref =2/3 Vdd - Iref=2mA.
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