Voltage on TDA1541´s decoupling pins...

[weissi]

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 DAC´s it´s 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. didn´t 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 it´s own 78Lxx (may they be to small?)

Thanks in advance

[Zodiac]

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....

[weissi]

Thanks Zodiac!

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

But I´ll play a little bit with the capacitor´s surrounding the TDA, there may be a possibility to "tune" bass to my flavor...

Thanks again....

[Peter K]

On Lesha's webside http://users.podolsk.ru/boga/DAC.html you will find the the voltage info you need.

Best regards,

Peter

[weissi]

yes, thanks again!
Well, I measured more or less the same voltages beside output voltage, it´s about 3V, forgot if it´s + or -...... I´m 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 don´t likes that high voltage... As soon as I get my 35V/86µ Cerafines I´ll know if that gives me an improvement....
It´s a shame I´ll have to wait for the weekend