Aleph X DC offset - Page 2

tomchaoda · 18th October 2004, 04:57 PM

Grey:

Many thanks for the info. I will give it a try!

Thomas

tomchaoda · 29th October 2004, 09:37 PM

As in the progress of making the DC offset as low as possible, I have tried to changed the Q5/Q7 pack with matched pair down to 0.01v. Not only that, I also matched my R/23/R25 and all the Q2/Q11 mosfet. However, by swapping the Q5/Q7 many times (and changed many pairs), I can only goes down to about 30 mv. By adding my X-BZLS or A-P, the will rise to about 70-80 mv. This is not bad actually; however, I just feel more comfortable if it stays lower than this!

After re-study the wiki page and the schematic again, I decided to use the resister tweak. I changed R25 with a 500 ohm VR and adjust it. At about 402 ohms, I bring the DC offset down to about 12 mv. By adding the pre-amp, it stays stable at about 26 to 30 mv. Perfect for me!

I then test it with different music. I did not sense any degradation in the sound quality. I am wondering by using un-matched R23/R25, will it cause any problem (or sound change) in the long run?

Any idea is appreciate!

Thomas

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18th October 2004, 04:57 PM	#11
tomchaoda diyAudio Member Join Date: Sep 2003 Location: New Jersey	Grey: Many thanks for the info. I will give it a try! Thomas

29th October 2004, 09:37 PM	#12
tomchaoda diyAudio Member Join Date: Sep 2003 Location: New Jersey	As in the progress of making the DC offset as low as possible, I have tried to changed the Q5/Q7 pack with matched pair down to 0.01v. Not only that, I also matched my R/23/R25 and all the Q2/Q11 mosfet. However, by swapping the Q5/Q7 many times (and changed many pairs), I can only goes down to about 30 mv. By adding my X-BZLS or A-P, the will rise to about 70-80 mv. This is not bad actually; however, I just feel more comfortable if it stays lower than this! After re-study the wiki page and the schematic again, I decided to use the resister tweak. I changed R25 with a 500 ohm VR and adjust it. At about 402 ohms, I bring the DC offset down to about 12 mv. By adding the pre-amp, it stays stable at about 26 to 30 mv. Perfect for me! I then test it with different music. I did not sense any degradation in the sound quality. I am wondering by using un-matched R23/R25, will it cause any problem (or sound change) in the long run? Any idea is appreciate! Thomas

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