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Class D Switching Power Amplifiers and Power D/A conversion

Another Lepai TA2020 Boombox
Another Lepai TA2020 Boombox
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Old 25th June 2012, 01:33 AM   #1
avincenty is offline avincenty  United States
diyAudio Member
Join Date: Jan 2008
Location: Southern California
Default Another Lepai TA2020 Boombox

I am going on vacation at the end of next week and decided to build boombox I can take as carry on.

I used 4 Radio Shack 40-1354 drivers and 4 cheapo Audax tweeters. The pairs are wired in phase and the tweeters are crossed with a 4uf cap. The box has a basic speaker pocket made with 3/4 plywood and the fronts are skinned with a material I found at the surplus store. Don't know the name but it is pretty easy to work with. It is a 1/4 inch panel with aluminum skin with a plastic triangular comb to give it rigidity and strength. It is light and strong and cuts great in the table saw.

I decided to use a Lepai amp because it is what I had. Had I not had them I would have used something else. The Lepai's are cheaply made and very finicky. I burned one unit. I had to isolate the audio Input ground and the PS ground.

As far as the speaker tuning, I think I ended up with an aperiodic enclosure. Initially drilled a 1.5 inch hole to put a port. I tried different port sizes and looked at the impedance measurements for each. The impedance curve was the flattest with the 1.5 hole plugged with a piece of foam.

The battery is a 12V 7ah SLA battery. I used a DPDT to select between Battery operation and PS operation. In the PS operation the DPDT switch is wired so that the charger can be connected. The battery was connected with a 6amp diode in series so as to have the diode drop when the battery is fully charged. This way I do not have to modify the Lepai to accept the higher voltage.

I used the Lepai case itself as a large nut to hold the amp to the boombox, I used #2 screws.

Sounds quite nice and pretty loud. Need to find out if TSA will allow the SLA battery thru security.
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Old 2nd October 2012, 04:50 PM   #2
david11 is offline david11
diyAudio Member
Join Date: Oct 2012
Hello dude!

i just bought this amplifier Lepai , and i want to build a Boombox just like yours !
it`s awesome!

do you have maybe more comprehensive plans on how to build it?

my main problems are :

how to connect the amplifier and the Battery ( just like yours ) together + i want to be able to charge it

second problem are you sure that the AMP can get this battery ? it is 7.5AH and i heard that for the Lepai you can connect up until 5 AH


my mailbox


thanks again !
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Old 30th December 2012, 01:01 PM   #3
kaekahn is offline kaekahn
diyAudio Member
Join Date: Dec 2012
I too am building a boombox and i need to know how in detail how to wire the amp in order to switch it from battery power to PS...please let me know. kaekahn@gmail.com. Im a bit of a noob at this.
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Old 19th February 2015, 04:07 PM   #4
pabmeister is offline pabmeister
diyAudio Member
Join Date: Feb 2015

I'm another newbie looking to make a boombox using the Lepai amp.

Like you, I'd love to have a battery and mains power. Could you send me any info about building this rig?

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