Hello.
I have been picked as responsible for making a loud boombox for my camp at this years Roskilde Festival.
Need some help picking a loud and efficient solution for the amp part.
What i have so far:
2x Cerwin Vega LS-12
Some 12v 7.2 Ah SLAs
1500dkk ~ 265$ ~ 200€ to spend on amp and batteries to make it play for 8 days.
To keep it simple and not to mess with an allright pair of speakers, I will probably keep the speakers in their original cabinets an simply connect them to a box with amp and batteries.
My suggestion so far:
Cheap TK-2050 based 2x50W from ebay with 2x SLAs serial connected for 24V
New TK2050 50W 50W Class T HiFi Stereo Audio Digital Amplifier Board 12V Voltage | eBay
Pros:
Cheap (so lot of money left for batteries)
Seems like an easy plug and play solution
Cons:
I have read that idle power on this amp is quite high, so looking for.
Dont know for how long it will play.
I am also looking at some cheap TDA7498 based amps on ebay.
Any thoughts on this?
Other suggestions would be highly appreciated. Thank you.
I have been picked as responsible for making a loud boombox for my camp at this years Roskilde Festival.
Need some help picking a loud and efficient solution for the amp part.
What i have so far:
2x Cerwin Vega LS-12
Some 12v 7.2 Ah SLAs
1500dkk ~ 265$ ~ 200€ to spend on amp and batteries to make it play for 8 days.
To keep it simple and not to mess with an allright pair of speakers, I will probably keep the speakers in their original cabinets an simply connect them to a box with amp and batteries.
My suggestion so far:
Cheap TK-2050 based 2x50W from ebay with 2x SLAs serial connected for 24V
New TK2050 50W 50W Class T HiFi Stereo Audio Digital Amplifier Board 12V Voltage | eBay
Pros:
Cheap (so lot of money left for batteries)
Seems like an easy plug and play solution
Cons:
I have read that idle power on this amp is quite high, so looking for.
Dont know for how long it will play.
I am also looking at some cheap TDA7498 based amps on ebay.
Any thoughts on this?
Other suggestions would be highly appreciated. Thank you.
I'd go with something TPA3116D2 based - there's lots of them in the "TPA3116" thread on the first page of this forum. If you can, find an amp card with jumpers/switches to select the switching frequency and switch between BD and 1SPW mode - set the amp to the lowest switching frequency possible and 1SPW mode to save as much power as you can.
The TPA3116 will happily run off 12V, and even 24V depending on the state of charge on the batteries (it has OVP at 27V, which will trip if your batteries are >13.5V)
Rather than amassing as many batteries as you can, I'd track down a 10W solar panel to charge your batteries throughout the day.
The TPA3116 will happily run off 12V, and even 24V depending on the state of charge on the batteries (it has OVP at 27V, which will trip if your batteries are >13.5V)
Rather than amassing as many batteries as you can, I'd track down a 10W solar panel to charge your batteries throughout the day.
Thanks gmarsh for your quick response.
I have been reading most of the thread, but can't seem to find what you are describing.
Would any of these fit:
Free Shipping!!! 5pcs TPA3116 D digital amplifier class / 50W +50 W / band Silent Sleep Design / heatsink-in Other Electronic Components from Electronic Components & Supplies on Aliexpress.com
Assembled TPA3116 store Power amplifier board 50W+50W-in Consumer Electronics on Aliexpress.com
Amplifier Board TPA3116 Class D 2X50W The Only with Speaker Protection | eBay
I have been reading most of the thread, but can't seem to find what you are describing.
Would any of these fit:
Free Shipping!!! 5pcs TPA3116 D digital amplifier class / 50W +50 W / band Silent Sleep Design / heatsink-in Other Electronic Components from Electronic Components & Supplies on Aliexpress.com
Assembled TPA3116 store Power amplifier board 50W+50W-in Consumer Electronics on Aliexpress.com
Amplifier Board TPA3116 Class D 2X50W The Only with Speaker Protection | eBay
...and would it make sense to have 2 amps in bridge mode, 1 for each speaker. Or will it break my speakers?
Some of the TPA3116 amps will cut off at 25V. But if I run it at 12v it will be signifficantly less loud, right?
Would it help to add one or more diodes with a voltage drop of 1V to stay under 25v/26v/27v?
Some of the TPA3116 amps will cut off at 25V. But if I run it at 12v it will be signifficantly less loud, right?
Would it help to add one or more diodes with a voltage drop of 1V to stay under 25v/26v/27v?
See jpg for power graph from data sheet. (double voltage ~4X power.)
Not a bad idea.
Have it switchable and monitor with DMM.
Attachments
Thanks DUG for helping me!
You mean manually switchable, right? Something like a jumper or a switch?
Would 2 or 3 of these in series https://www.elextra.dk/main.aspx?page=article&artno=H13973 work? is it enough with 6 amp diodes?
Would it be more efficient to step up the voltage from 12v to 21v or more?
Or down from 28v?
Maybe i am using the wrong words then. What i mean is using 2 amps in mono mode 1x100w for each speaker.
You mean manually switchable, right? Something like a jumper or a switch?
Would 2 or 3 of these in series https://www.elextra.dk/main.aspx?page=article&artno=H13973 work? is it enough with 6 amp diodes?
Would it be more efficient to step up the voltage from 12v to 21v or more?
Or down from 28v?
Ahhh...what you mean is one TPA3116D2 per speaker in PBTL mode.
With an 8R load you will not get any more power in PBTL configuration than with the TPA3116D2 in 2 channel BTL ("normal") configuration.
To get more power than the graph I posted you will need to use a lower impedance speaker.
6A diode will work.
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