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Old 25th September 2004, 02:40 PM   #1
tubee is offline tubee  Netherlands
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Default four 1541,s parallel?

I am thinking to make a da converter, I2S signal, non OS and with 4 tda 1541a parallel like Cambridge and Wadia did in the nineties, feeding the digital signal to 4 dacs PCM56 or 1541 with 0.7 microsec. delaytime (1/4 Fs).
This to smooth the analog signal and reduce distorsion
Anyone experienced by this, or has idea's or schematics?

Also anyone who knows where to buy TDA 1541A on a reasonable price?

Tubee
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Old 28th September 2004, 01:20 AM   #2
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Here is a circuit for the PCM56 that can be modified to suit the TDA1541A.

Paralleling up DAC chips
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Old 28th September 2004, 03:15 PM   #3
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I have a few used 1541A left.
Maybe change to 2 x XX PCM56 soon...
Tested 17 chips recently and found some that beat every silvercrown
Sound much better than CD880 in a DCD1500mkII.
Not beat me...
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Old 28th September 2004, 03:21 PM   #4
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Hi Tubee,

Quote:
Also anyone who knows where to buy TDA 1541A on a reasonable price?
If you' re interested, there' s a group buy for TDA1541A going on, look in the "group buy" section.

Cheers,

Bruno
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Old 28th September 2004, 05:37 PM   #5
tubee is offline tubee  Netherlands
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Hello Bernard

How do you test the used tda's?

By the way I now turn my CD's on a '83 CD300 with double1540!
Bought on a second hand market for a few Euri,s
CD drawer is about 6 cm high, that something else that those "plasticbombers"from now. Wadia used the same tuntable mechanism in the 90''s. Treble not perfect, but bass is wonderful. There are about 8 Sony chips in it also (logic or so), it seems at that time they worked ("a bit") together, philips & sony

tubee
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Old 28th September 2004, 06:39 PM   #6
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Quote:
Originally posted by tubee
it seems at that time they worked ("a bit") together, philips & sony
They invented the cd system together.
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Old 28th September 2004, 10:12 PM   #7
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Quote:
Originally posted by tubee

How do you test the used tda's?

By the way I now turn my CD's on a '83 CD300 with double1540!

Treble not perfect, but bass is wonderful.
Spectrum analyzer with -60dB signal

TDA1540 is 14bit mono DAC.

Very hard for 14bit to give perfect treble...
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