|10th October 2005, 10:11 AM||#11|
Join Date: Aug 2001
Location: Ingolstadt Germany
1.try to set the bias (start with both (V1/V3) pots at 0 Ohm) . Both sides should have the same bias, youŽll have to adjust them a bit as the bias changes during warmup.
2.Then set the absolute dc-offset to zero with V2 that setŽs the bias through the diff pair. This should be done with the lid on the amp cause this is quite temperature sensitive. Adjust when warm (1-1.5 hours)
een ooievaar is geen konijn want zijn oren zijn te klein!
|10th October 2005, 05:47 PM||#12|
Join Date: Apr 2004
Thanx all, it looks like the problem is fixed. The output to te speaker terminals has now 9mv dc. From the -+ output to the ground 20 mv. There were some problems:
1 unbalanced - terminal connected to the groud without a cap.
2 the two resistors 2.2k changed to 4.7k
3 start point off v1/v2/v3 0 ohm, not in the center.
4 changed the irf9610 no heatsink, but mounted together(with an insulator).
5 changed the resistor of the irf9610 (not the differential pair) to lower the bias.
After building 2 stereo aleph 5 without any problems, this mono aleph x amp is finished(i hope). Maybe i will change the aleph 5 to aleph x high voltage .
|Thread Tools||Search this Thread|
|Thread||Thread Starter||Forum||Replies||Last Post|
|Aleph X - mosfet temperature||yoke||Pass Labs||48||16th December 2006 05:06 PM|
|PCM1702 sensitive to ESD?||klitgt||Digital Source||11||14th February 2006 05:22 AM|
|operating temperature for Aleph||Phill||Pass Labs||9||22nd November 2005 12:06 AM|
|aleph 2 temperature||MikeZ||Pass Labs||18||15th November 2003 01:16 AM|
|Aleph Temperature Sweet Spot||macka||Pass Labs||12||21st March 2002 10:39 AM|
|New To Site?||Need Help?|