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Old 10th May 2012, 07:22 PM   #551
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I have just assembled this amp and whant to double check if i understand right, how bias adjustment is done.
As i understad... i need to measure voltage acros of any 0.47R resistor and adjust pot till voltage reachess 30mV? That is it or im missing something?
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Old 10th May 2012, 09:38 PM   #552
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Quote:
Originally Posted by harizhent View Post
I have just assembled this amp and whant to double check if i understand right, how bias adjustment is done.
As i understad... i need to measure voltage acros of any 0.47R resistor and adjust pot till voltage reachess 30mV? That is it or im missing something?
Yes, but if you can't set 30mV replace 470R pot with 1k.
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Old 11th May 2012, 05:25 AM   #553
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Hmm voltage was riseing till reached ~35mV and started droping.. after it reached ~17mV...bam... fuse is gone and with that one pair also
Im sure i have missed something...
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Old 11th May 2012, 09:54 AM   #554
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Originally Posted by harizhent View Post
Hmm voltage was riseing till reached ~35mV and started droping.. after it reached ~17mV...bam... fuse is gone and with that one pair also
Im sure i have missed something...
Can you post pictures?
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Old 11th May 2012, 10:57 AM   #555
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Ofcourse. Apex could you help me determine the problem?
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Old 13th May 2012, 11:47 AM   #556
shreya is offline shreya  India
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How much RMS power i can get with +/-60Vdc at 8 & 4 ohms??
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Old 13th May 2012, 12:02 PM   #557
AndrewT is online now AndrewT  Scotland
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work it out !
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Old 13th May 2012, 12:08 PM   #558
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Originally Posted by shreya View Post
How much RMS power i can get with +/-60Vdc at 8 & 4 ohms??
Look at the next table in the article below (an article of two pages - see last table):
Surse de alimentare liniare pentru amplificatoare audio - calcul, teorie, concluzii - Surse de alimentare - Tehnium Azi - Articole (Articles) - Comunitatea Tehnium Azi
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Old 14th May 2012, 01:44 AM   #559
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It really depends on the regulation of the supply, how many VA the transformer is, the F of the caps, and whether or not you use a high voltage tier for the front-end.

It could be as little as 100W/8Ω or as much as 200W/8Ω.

The Hafler DH200 was rated at 100W/8Ω and ran on 63V, the XL280 (with another pair of outputs) ran on the same voltage but added a high-voltage tier for the front-end and clipped at 180W/8Ω.
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Old 14th May 2012, 07:37 PM   #560
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Click the image to open in full size.
Apex as i promised i have uploaded photo of amp
Later im going to make more photos, but first i need to fix that ifps's blowing problem.
Power suply is being used from montarbo active monitor +/-75v 2.1A(per rail) +2x10.00o0uf.
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