Zero DC-offset TDA1543 - Page 2

QSerraTico_Tico · 5th December 2008, 08:13 AM

Quote:

Originally posted by revintage
Take a closer look!

The TDA1543 is fed with +/-2,5VDC making the output 0V.

Zero DC-offset adjustment is with Vref resistor.

The digital input is therefor "level translated", see schematic!

My idea was to feed it with +/-4V and skip the output filters and OPs. As my output transformers can take no DC at all this must be a possible way to fix it.

My concern is how to look at the output loading as there will be no DC-current through the I/V-resistor, only AC?

Sorry Lars, I totally overlooked the dual supply for the TDA1543.
I am not sure the offset will be low enough for IV-transformers. Probably the Sowter 8347 can take it; the 9762 not!

revintage · 5th December 2008, 08:35 AM

Hi Quirck,
As I see it offset is adjustable to zero V so that part of should be no problem.

I am am into what Per-Anders wants to explain but I want a simpler solution without more sand. ie. using a transformer with suiatable DCR as I/V loading.

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5th December 2008, 08:35 AM	#12
revintage diyAudio Member Join Date: May 2007	Hi Quirck, As I see it offset is adjustable to zero V so that part of should be no problem. I am am into what Per-Anders wants to explain but I want a simpler solution without more sand. ie. using a transformer with suiatable DCR as I/V loading.