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Old 11th April 2005, 10:28 AM   #1
lawka is offline lawka  Hong Kong
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Talking Ouput DC

Hi

I have finished one of my Aleph2 Mono. However, I got a 60 mv DC at the speaker jack without signal connected. Is it troubled or can be used. I also checked the service manual of Aleph 2, the specification of DC offset mentioned <100mv. I don't quite understand the same things or not.

After 90 mins, I measured a 55 C (heat sink) under room temperature 25 C. The basis was adjusted 0.55A per Mosfet.

Please advise.

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Old 11th April 2005, 11:27 AM   #2
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Default Re: Ouput DC

Quote:
Originally posted by lawka
Hi

I have finished one of my Aleph2 Mono. However, I got a 60 mv DC at the speaker jack without signal connected. Is it troubled or can be used. I also checked the service manual of Aleph 2, the specification of DC offset mentioned <100mv. I don't quite understand the same things or not.

After 90 mins, I measured a 55 C (heat sink) under room temperature 25 C. The basis was adjusted 0.55A per Mosfet.

Please advise.

60 mV should be fine. This is the DC offset mentioned in the
service manual.

Just curious, did you measure this amount when the amp
was hot or cold?

I hear it's starting to get hot in HK. I guess you'll have to
aircondition to keep the room at 25C...

Cheers,
Dennis
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Old 11th April 2005, 05:00 PM   #3
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Hi LawKa,

I also from Hong Kong. Where did you find the Heat Sink ?
Hui,
Yes, Hong Kong will go in Summer !

Thomas
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Old 12th April 2005, 04:47 AM   #4
lawka is offline lawka  Hong Kong
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Thomas

I bought the chassis from Tai Wan with 4 sides heat sink.

Further, I will keep trying to well match the Q1 & Q2 and lowering the bias to maintian the safety temprature <50C (I guess <0.5A per mosfet).

Could anyone reveal the performance of using the CLC filter or CRC filter.

Thank you
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Old 14th April 2005, 10:21 PM   #5
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Hi lawaka
as some other members have said your offset is normal and
is the result of component tolerances and device spreads
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Old 15th April 2005, 01:38 AM   #6
Leolabs is offline Leolabs  Malaysia
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Yes,60mV is an acceptable offset value regarding component tolerance .U should pay much attention to the heatsink temperature.
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Old 15th April 2005, 04:31 AM   #7
lawka is offline lawka  Hong Kong
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Should I make a cooling fan at the top, useful or not. I also wish to ask the running temperature of original Aleph 2. Anyone can help.

Happy listerning.
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