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Old 12th September 2011, 09:05 PM   #1
st33n is offline st33n  Netherlands
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Default Building Speaker with integrated 2020

Hi,

I am building a speaker with a built in amp The speaker will be powered by a TA2020 amp.

I am going to order the following parts:
Power supply
TA2020
Speakers
Potentiometer

I can't find if there is a way to attach an on/off switch. Would this work?
I am mounting an ipod dock. Is it possible to attach multiple wires to the 12v and then convert that to 5v (USB)? Also I would love it if I could power off the amp, but not the ipod dock. So I can charge it whenever i put it in.


This is my first audio project. So if there is something not ok, please tell me.

Cheers
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Old 12th September 2011, 09:57 PM   #2
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I have never been a fan of amplifiers inside speaker boxes.
The first problem is vibration. Another problem is the varying air pressure due to the speaker pumping, this will put pressure on component cases especially electrolytics.
There is the problem of getting heat out of the wooden box. There is heat generated by the speaker(s).

Just my opinion.....
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Old 12th September 2011, 09:59 PM   #3
st33n is offline st33n  Netherlands
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Quote:
Originally Posted by nigelwright7557 View Post
I have never been a fan of amplifiers inside speaker boxes.
The first problem is vibration. Another problem is the varying air pressure due to the speaker pumping, this will put pressure on component cases especially electrolytics.
There is the problem of getting heat out of the wooden box. There is heat generated by the speaker(s).

Just my opinion.....
Thanks for the reply Nigel. The speakers and the amp will be in seperate compartments. Of course well vented so the box doesn't catch fire.
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Old 13th September 2011, 06:06 PM   #4
Zaaphod is offline Zaaphod  United States
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Location: Florida
Quote:
Originally Posted by st33n View Post
Hi,

I am mounting an ipod dock. Is it possible to attach multiple wires to the 12v and then convert that to 5v (USB)?


Cheers
You could use an LM7805 to regulate the 12V down to 5V. Make sure you heat sink it properly.
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Old 14th September 2011, 08:44 PM   #5
st33n is offline st33n  Netherlands
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Thanks. Will see where i can find the part. Does the 2020 generate a lot of heat?
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Old 14th September 2011, 08:54 PM   #6
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Quote:
Originally Posted by st33n View Post
Thanks. Will see where i can find the part. Does the 2020 generate a lot of heat?
It's 88% efficient with 8 ohms speakers, and uses a mere 60mA in idle, so practically none.

If in a well ventilated space you won't even need a heatsink at all with 8 ohms speakers.

Last edited by Saturnus; 14th September 2011 at 09:01 PM.
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Old 14th September 2011, 09:01 PM   #7
gychang is offline gychang  United States
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Location: Davis, California
Quote:
Originally Posted by st33n View Post
Hi,

I am building a speaker with a built in amp The speaker will be powered by a TA2020 amp.

I am going to order the following parts:
Power supply
TA2020
Speakers
Potentiometer

This is my first audio project. So if there is something not ok, please tell me.

Cheers
Arjen makes good amps, do u want mono only?, just one speaker?, if u r planning on stereo, u may want this. 50K Audio Taper Stereo Potentiometer 1/4" Shaft
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Old 14th September 2011, 09:19 PM   #8
st33n is offline st33n  Netherlands
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Good point Gychang, Thanks. I did not notice the one I specified was mono.

Cheers
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