Another I/V stage for TDA1541A - diyAudio
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Old 5th December 2006, 09:23 PM   #1
Sandor is offline Sandor  Italy
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Join Date: Mar 2004
Location: Milan
Default Another I/V stage for TDA1541A

Hello,
Some time ago I built a simple I/V stage for my DIY TDA1541 DAC.
That stage used a 47 ohm resistor for I/V, followed by a Sowter 8347 step-up transformer.
It performed well, but output voltage was much lower than usual and high output impedance made interfacing critical.
Now I am planning to lower the I/V resistor (in order to reduce distortion) and add an op-amp (OPA627) gain stage at the output which, hopefully, will also lower output impedance.
I am not an EE, so I would appreciate opinions from you skilled friends.
Best regards.

Paul

please look at the attached schematic
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File Type: jpg i-vstage.jpg (52.1 KB, 552 views)
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Old 6th December 2006, 07:09 AM   #2
Archwn is offline Archwn  United Kingdom
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Join Date: Oct 2006
The datasheet do recommend the output voltage to be no less than 25mV. People suggest that the output current is around 1mA so less than 25ohm i/v resistor would do. (one of my friend prefer 39R instead) But then you need around 1:100 gain to get 2V out.

OPA637 is another option when gain>5 is required.

Correct me if I'm wrong but this circuit yields 180deg out of phase. I'm nobody in electronic world either.
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