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Old 13th January 2004, 05:11 PM   #1
weissi is offline weissi  Europe
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Default Voltage on TDA1541īs decoupling pins...

Who will be so nice to measure the voltage on the decoupling pins of the TDA1541a? The reason is that I have some troubles with the bass reproduction.... compared to some other DACīs itīs a very "hidden" bass and it seems to me that there is a lack in the region of ~100-200Hz I have not had this with my (now recycled) non-os 1541 standalone dac... the current one is located in a Sony CDP. didnīt had the chance to do any frequency dependend measurements (= no scope )

P.S.: Decoupling is very well improved, I/V is currently active with AD8620, muting trans. removed....., the TDA got itīs own 78Lxx (may they be to small?)

Thanks in advance
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Old 14th January 2004, 10:41 AM   #2
Zodiac is offline Zodiac  United States
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It is a bit of a characteristic of the TDA1541 to have a bit of a indistinct bass. This is more related to the DAC chip itself it seems. Paralleling may improve matters.

Do a google search, Lesha has a TDA1541 page with the voltages he measured....
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Old 14th January 2004, 04:00 PM   #3
weissi is offline weissi  Europe
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Thanks Zodiac!

Yeah, might be a property of the TDA, as I compared it to some TI R2R DACīs they all have the same bass.....
I should have known this, every ciompany has itīs own sound, is it in opamp or even dacīs.... But with sigma-delta itīs more complicated.... I donīt like them....

But Iīll play a little bit with the capacitorīs surrounding the TDA, there may be a possibility to "tune" bass to my flavor...

Thanks again....
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Old 14th January 2004, 06:14 PM   #4
Peter K is offline Peter K  Netherlands
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On Lesha's webside http://users.podolsk.ru/boga/DAC.html you will find the the voltage info you need.

Best regards,

Peter
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Old 14th January 2004, 07:34 PM   #5
weissi is offline weissi  Europe
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yes, thanks again!
Well, I measured more or less the same voltages beside output voltage, itīs about 3V, forgot if itīs + or -...... Iīm using an ordinary active I/V with AD8620.... and therefore this voltage also exists on the opamp output.... coupled only witha 6,5V OSCON... Maybe he donīt likes that high voltage... As soon as I get my 35V/86ĩ Cerafines Iīll know if that gives me an improvement....
Itīs a shame Iīll have to wait for the weekend
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