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Old 13th January 2007, 05:37 AM   #1
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Default new amp

I am planning to make a new amp and I need feedback on my design.
my amp is intended for a small sub-woofer.
I have attached a schematic below.
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Old 13th January 2007, 12:34 PM   #2
AndrewT is offline AndrewT  Scotland
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Hi,
the 26r (or 27r?) on the output seems a little high.
And you should add the other half of the Thiele network to the the output so that the amp sees a high frequency load.

The passive single pole low pass filter seems a bit unusual.

It will let through much of the audio signal.
In fact the signal out of the sub will be quite intelligible the way you have shown it.
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Old 13th January 2007, 02:46 PM   #3
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Default ok

thanks for the reply. I am new at this.

do you have a link to a good crossover?
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Old 13th January 2007, 02:46 PM   #4
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Default new design

I am not sure what wattage the second output resistor needs.
here is an updated diagram.
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Old 13th January 2007, 05:35 PM   #5
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I have to agree with AndrewT about the passive crossover. I messed with them for quite awhile and never got rid of the spikes they allowed to pass.

Also, I just built a sub amp using an LM3886 and with the below active crossover, the thing peforms way past my expectations.

Edit: Your schematic does not show the mute resistor.

Concider this.
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Old 13th January 2007, 05:56 PM   #6
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Default mute

I do not plan to use the mute .

thanks for the active x-over diagram though.
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Old 13th January 2007, 07:03 PM   #7
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Default Re: mute

Quote:
Originally posted by Jack Bruce
I do not plan to use the mute.
You don't have an option, it has to be connected. Leave the switch out.
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Old 13th January 2007, 08:57 PM   #8
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Default re: mute

ok thanks.
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Old 13th January 2007, 10:57 PM   #9
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Default output filter

would this work for a low frequency output?

the capacitor is a .1 uf
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Old 19th January 2007, 03:04 PM   #10
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Talking It works!!

my new sub-woofer amp works.

8 inch sub
50 watt trafo
adjustable gain
8200 uF filter capacitors
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