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Old 11th April 2009, 07:32 PM   #1041
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Well, there is an ugly amp thread. If there is no ugly speaker thread yet, you might start it off .
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Old 11th April 2009, 11:53 PM   #1042
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This amp is for my pc, and i use my sound card for bass-cut. The main speakers dont actually get any bass from below about 120 hz.
So the enclosure size isnt a problem really. And they needed to be as small as possible because they need to fit on my desk hehe.


The pots arent motorized, its just a kinda of a preset thing.
I set it at after a bit of experimenting with the computer sound contrl.
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Old 12th April 2009, 01:12 AM   #1043
ttan98 is online now ttan98  Australia
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Rainwulf,

I like the way you use the 4 gears to control the alps pots..
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Old 12th April 2009, 04:20 AM   #1044
sasmit is offline sasmit  India
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I'm worried about the three fans...hope they're not creating a racket
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Old 12th April 2009, 09:44 AM   #1045
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Thanks ttan98

Sasmit, the fans are temperature controlled via a sensor on the sub amp module heatsink. They run at a nominal voltage of around 3.3 volts where they are barely audible. As the heatsink warms up, the fans speed up.

I am not worried about the LM3875 modules, as they have their own temperature control and protection systems.
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Old 12th April 2009, 09:48 AM   #1046
AndrewT is offline AndrewT  Scotland
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Hi Rainwulf,
how have you arranged for a motor start up "kick"?
This will become necessary as the motors age, the lubrication gets sticky and lots of fluff clog up the workings.
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Old 12th April 2009, 10:25 AM   #1047
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No, havent done that. But would be very easy to do, just add one capacitor to the fan control circuit.
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Old 13th April 2009, 03:02 AM   #1048
ttan98 is online now ttan98  Australia
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Quote:
Originally posted by Rainwulf
Thanks ttan98

Sasmit, the fans are temperature controlled via a sensor on the sub amp module heatsink. They run at a nominal voltage of around 3.3 volts where they are barely audible. As the heatsink warms up, the fans speed up.

I am not worried about the LM3875 modules, as they have their own temperature control and protection systems.
you are welcome to put the circuit that controls the fan speed here.
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Old 13th April 2009, 08:29 AM   #1049
abbe is offline abbe  India
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Default TDA7294 Double side pcb

TDA7294 Double side pcb Image
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File Type: jpg tda7294_pcb.jpg (59.4 KB, 2150 views)
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Old 13th April 2009, 10:24 AM   #1050
abbe is offline abbe  India
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TDA7294 Double side pcb pdf zip
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