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Old 12th November 2003, 09:15 PM   #1
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Default n channel amp temperatur

hi

i've build the n-channel amp from www.aussieamps...... with my own pcb. It works great. B]But is it true, that the heatsink temperatur is without load 50-60 degrees??[/B]
i've not matched the mosfets, so is this the problem?

thx a lot
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Old 12th November 2003, 09:41 PM   #2
Cobra2 is offline Cobra2  Norway
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Default Re:

I have no exact temp. measurement yet, but I do not think mine is more than ~ 40 C, when bias is set as instructed.

(BTW, do you have spare PCB's?)

Arne K
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Old 12th November 2003, 09:45 PM   #3
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Default PCBs

the pcbs are selfmade.
tomorrow i can post a pic. or if you want a .brd file.

i check bias tomorrow too.

thx
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Old 13th November 2003, 11:11 AM   #4
LBHajdu is offline LBHajdu  United States
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The idol dissipation of this amp is 42watts. Most class A\B amps would consider that high, however this amp is not really biased that high (300mA), its just that the rails use a high voltage +-70v. It would be a good idea to see what effect changing the bias has on the sound.

The heat sink temp is what ever your heat sinks say it is. The Bigger the heat sink the lower the temp. To find out what the idol dissipation temp is just take 42 and multiply it by the thermal coefficient of the heat sink. The amp will dissipate more when its playing music. If you think something is wrong with the bias just keep an eye on the .33ohm resistors. If there is more the .033V across it then you bias is off.

How do you think this amp sounds? Could you compare this amp to something else?

Were all waiting for pics.
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Old 13th November 2003, 07:28 PM   #5
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Lightbulb here is my pcb

here is my own pcb.
i've made it with eagle.

it works great, but keep a look at Q1, Q16 and Q13.
there was some trouble with them because of a false pinout in my pcb. i've corrected this, but still keep a look.

i'm creating currently some new pcb with a protection circuit witch is a little smaller. hear from me later.

feel free to ask.

best regards

ps: betterquality pics on inquires
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Old 13th November 2003, 08:19 PM   #6
Cobra2 is offline Cobra2  Norway
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Default Re:

Hi!
If you do a re-design, you could moove the bias-compensating transistor....so it is closer to the output devices, (it will probably need extension-leads anyway to reach ontop?).
See: http://www.diyaudio.com/forums/showt...0663#post80663


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Old 13th November 2003, 08:58 PM   #7
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in my amp i've connect the bias-compensating transistor with a cable to the pcb. it is on top of one of the output mosfets.

when i've my digicam back i would take some pics ofthe real pcb and amp.

best regards
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