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Old 30th January 2009, 08:16 AM   #61
anbello is offline anbello  Italy
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Hi stefanobilliani,
i would like to know if it's possible to use 2 o 4 tda1543 in parallel sharing the same i/v d1 stage (i mean the 4 i out of the dacs entering in 1 d1 stage).
Another question: the out of the d1 can directly drive the next stage (a pre or chipamp in my case) or needs some sort of buffering?

Thanks
Andrea
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Old 2nd February 2009, 09:33 AM   #62
Luke is offline Luke  New Zealand
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anyone?
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Old 2nd February 2009, 10:25 AM   #63
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Quote:
Originally posted by anbello
Hi stefanobilliani,
i would like to know if it's possible to use 2 o 4 tda1543 in parallel sharing the same i/v d1 stage (i mean the 4 i out of the dacs entering in 1 d1 stage).
Another question: the out of the d1 can directly drive the next stage (a pre or chipamp in my case) or needs some sort of buffering?

Thanks
Andrea
Yes you can use that approach , you will need to change some values of resistance to make it work properly . Not sure if you will get improvements , the best thing is to try .
I remember I tryed 2 of them and they did work ok .

Regarding the output driving that there is not a problem at all unless you need more gain .
The output impedance is already low enough , of course I omitted in this thread the use of buffers for semplicity and also becouse , probably , the amps I play with are often buffered at theyr input ( see Zen V4 that includes the buffer at its input and inside the feedback loop ).



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Old 2nd February 2009, 10:48 AM   #64
Luke is offline Luke  New Zealand
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Hi Stefan,

any idea why mine doesnt play music?
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Old 2nd February 2009, 01:05 PM   #65
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How many 1543 are you using?
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Old 2nd February 2009, 11:31 PM   #66
Luke is offline Luke  New Zealand
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I am using 2, from the 74hc86 to the dacs is exactly as your schematic.
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Old 3rd February 2009, 08:08 AM   #67
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Ah ok , so you are doing balanced mode . I see you use the I/V resistor , you need 4 of them . Do this test: leve out the Xor ports and check if each Tda works in Single Ended mode . Control also the voltages at the PIN 6,7, 8 . and remember that with the Cascode I/V stage there is no need to control the pin 7( as shown in schematic posted) , while if you use I/V resistors that pin CANNOT be left alone , but there is the need to create a current through it with a resistor , typically 1k ohm or so to ground .
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Old 3rd February 2009, 08:29 AM   #68
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I also experimented to connect pin 7 ( and his resistance ) to a negative voltage , and had very nice results IMHO in terms of dynamics . I mean something like -30 volts .
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Old 3rd February 2009, 08:54 AM   #69
Luke is offline Luke  New Zealand
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Thanks Stefan,

Pin 7 (vref) is 1.5K, pins 6 and 8 is 2.7K.
I will try and bypass the Xor and try single ended tomorrow, its bed time. Thanks
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Old 1st May 2009, 04:37 AM   #70
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Hi Stef,

I am tempted to try the D1 but I have only +/-15V on hand, do I need to half the value for R1 and R2?
And what is the resistance from pin 7 to ground.
Thanks.
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