A3 heat dissipation problem

spTOH · 2nd October 2006, 11:19 AM

Dear all,

I owned an A3 clone quite sometime ago but due to the insufficient size of my heatsink, I can only ON it less than 2hrs. I wish someone can advise me is there any problem if I simply remove one of the output stage as shown in the attached circuit?

Attachment removed per owners request. /Netlist

Netlist · 2nd October 2006, 11:25 AM

Why not try a little silent fan? These can do wonders.

/Hugo

spTOH · 2nd October 2006, 01:04 PM

Thanks, great idea perhaps I should think where to attach the fan to my casing. Previously I was thinking to reduce the O/p power because I only need a few watts for my spkrs as my volume control never turns beyond 9 o'clock for my normal listening level.

Thanks,
spTOH

BroncoKhoo · 2nd October 2006, 03:42 PM

It is hramless for you to simply remove one output pair (formed by the constant curren source and the amplification stage). Besides, you may reduce the Vcc supply from 25V to 18V. This reduction will not only reduce the power consumption for the IRF244 Mosfet, but also the frequency response will not be affected. The drawback for this modification is that, the allowed voltage bandwidth will reduce from 23V to 16V. I assume you don't require 64Vpp for your speakers.

spTOH · 3rd October 2006, 06:45 AM

Thanks Bronco for the explanation. Seems like remove one of the output pair also have to reduce the supply voltage. So I think the most easier way is just try a silent fan without add any circuitry to further reduce the supply voltage.

Thanks,
spTOH

2nd October 2006, 11:19 AM	#1
spTOH diyAudio Member Join Date: Jul 2004 Location: Malaysia	A3 heat dissipation problem Dear all, I owned an A3 clone quite sometime ago but due to the insufficient size of my heatsink, I can only ON it less than 2hrs. I wish someone can advise me is there any problem if I simply remove one of the output stage as shown in the attached circuit? Attachment removed per owners request. /Netlist

2nd October 2006, 03:42 PM	#4
BroncoKhoo diyAudio Member Join Date: Oct 2006	Power Reduction Tips for Aleph3 It is hramless for you to simply remove one output pair (formed by the constant curren source and the amplification stage). Besides, you may reduce the Vcc supply from 25V to 18V. This reduction will not only reduce the power consumption for the IRF244 Mosfet, but also the frequency response will not be affected. The drawback for this modification is that, the allowed voltage bandwidth will reduce from 23V to 16V. I assume you don't require 64Vpp for your speakers.

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2nd October 2006, 11:25 AM	#2
Netlist diyAudio Moderator Join Date: Jan 2003	Why not try a little silent fan? These can do wonders. /Hugo

2nd October 2006, 01:04 PM	#3
spTOH diyAudio Member Join Date: Jul 2004 Location: Malaysia	Thanks, great idea perhaps I should think where to attach the fan to my casing. Previously I was thinking to reduce the O/p power because I only need a few watts for my spkrs as my volume control never turns beyond 9 o'clock for my normal listening level. Thanks, spTOH

3rd October 2006, 06:45 AM	#5
spTOH diyAudio Member Join Date: Jul 2004 Location: Malaysia	Thanks Bronco for the explanation. Seems like remove one of the output pair also have to reduce the supply voltage. So I think the most easier way is just try a silent fan without add any circuitry to further reduce the supply voltage. Thanks, spTOH

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