Ouput DC

lawka · 11th April 2005, 10:28 AM

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.

Dennis Hui · 11th April 2005, 11:27 AM

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

thomasfw · 11th April 2005, 05:00 PM

Hi LawKa,

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

Thomas

lawka · 12th April 2005, 04:47 AM

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 <50°C (I guess <0.5A per mosfet).

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

Thank you

mastertech · 14th April 2005, 10:21 PM

Hi lawaka
as some other members have said your offset is normal and
is the result of component tolerances and device spreads

Leolabs · 15th April 2005, 01:38 AM

Yes,60mV is an acceptable offset value regarding component tolerance

.U should pay much attention to the heatsink temperature.

lawka · 15th April 2005, 04:31 AM

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.

11th April 2005, 10:28 AM	#1
lawka diyAudio Member Join Date: Nov 2003 Location: Hong Kong	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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11th April 2005, 05:00 PM	#3
thomasfw diyAudio Member Join Date: Jan 2005 Location: Hong Kong	Hi LawKa, I also from Hong Kong. Where did you find the Heat Sink ? Hui, Yes, Hong Kong will go in Summer ! Thomas

12th April 2005, 04:47 AM	#4
lawka diyAudio Member Join Date: Nov 2003 Location: Hong Kong	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 <50°C (I guess <0.5A per mosfet). Could anyone reveal the performance of using the CLC filter or CRC filter. Thank you

14th April 2005, 10:21 PM	#5
mastertech Banned Join Date: Mar 2005 Location: Australia	Hi lawaka as some other members have said your offset is normal and is the result of component tolerances and device spreads

15th April 2005, 01:38 AM	#6
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Yes,60mV is an acceptable offset value regarding component tolerance .U should pay much attention to the heatsink temperature.

15th April 2005, 04:31 AM	#7
lawka diyAudio Member Join Date: Nov 2003 Location: Hong Kong	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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