DC Offset on Class A headphone amp. - Page 5

Dxvideo · 21st July 2007, 07:21 AM

Yes Its swinging between -4 to 0mV while pot is moving.
Is it bad?

AndrewT · 21st July 2007, 07:55 AM

Hi,
only 4mV swing with vol pot adjustment is very good.
Many amps swing as much, or more, just from temperature effects alone.

Dxvideo · 21st July 2007, 08:15 AM

And these are the final situation of the amp... Enclosured and tested..

Not beatifull but works.. The trimpots are from old design. Not connected to anywhere bur I didnot remove..

AndrewT · 21st July 2007, 08:34 AM

How does the heat get out of that plastic box!

Dxvideo · 21st July 2007, 08:35 AM

We will see... I am not sure because I've tested it outside the box until now. May be I will drill some dirty holes upside..

21st July 2007, 07:21 AM	#41
Dxvideo diyAudio Member Join Date: Nov 2003 Location: Turkey	Yes Its swinging between -4 to 0mV while pot is moving. Is it bad? __________________ Best regards, Ozgur

21st July 2007, 07:55 AM	#42
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, only 4mV swing with vol pot adjustment is very good. Many amps swing as much, or more, just from temperature effects alone. __________________ regards Andrew T.

21st July 2007, 08:15 AM	#43
Dxvideo diyAudio Member Join Date: Nov 2003 Location: Turkey	And these are the final situation of the amp... Enclosured and tested.. Not beatifull but works.. The trimpots are from old design. Not connected to anywhere bur I didnot remove.. __________________ Best regards, Ozgur

21st July 2007, 08:34 AM	#44
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	How does the heat get out of that plastic box! __________________ regards Andrew T.

21st July 2007, 08:35 AM	#45
Dxvideo diyAudio Member Join Date: Nov 2003 Location: Turkey	We will see... I am not sure because I've tested it outside the box until now. May be I will drill some dirty holes upside.. __________________ Best regards, Ozgur


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