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2.1 Boom Box Design Questions
2.1 Boom Box Design Questions
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Old 4th May 2021, 08:28 PM   #11
stv is offline stv  Europe
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Quote:
Originally Posted by Buzzliteyear View Post

I dont want it to over heat.....is there a better board ? or a mod

So id still need a crossover
Hi brett, sorry to spoil the fun. Anyhow, you could just try the amp and see if it is ok for you.
The board does not really overheat, just the inductors get rather hot but i suppose not so much to be dangerous. There is probably some minor oscillation, thus the high idle current - could be a problem for battery supply.
For me the switching on thump for subwoofer was annoying. The op-amps for subwoofer-filter thump when the supply voltage divider cap charges (plus coupling caps charging). The board does not have any switching on delay, but you could add one to solve this problem. Have a look here: TPA3116D2 Boards

Filter for the L+R channels may not be necessary, if you build closed boxes with the right rolloff.
Stv
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Old 4th May 2021, 09:39 PM   #12
stv is offline stv  Europe
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i just found the frequency response graphs that i measured with my board:
bass filter is 12dB/oct with -3 dB at about 60 Hz.
sat responses look ok, but channels were about 4dB off (see pink and red, with same potentiometer settings).
MAX means bass/sat pot on maximum setting. MED/MEDIUM is pot on medium setting.

i also did an overlay of top and bottom PCB layout, to see what could be done with the board. maybe it's of some use for you!
cheers, s
Attached Images
File Type: png bass-resp.png (18.8 KB, 38 views)
File Type: png all_resp.png (22.3 KB, 36 views)
File Type: jpg board.jpg (507.3 KB, 29 views)
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Old 4th May 2021, 10:00 PM   #13
stv is offline stv  Europe
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... and i even drew a schematic of the amp, see attached. I am not 100% sure everything is complete and correct.
oh, and the output section is not drawn.
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File Type: pdf schematic.pdf (42.7 KB, 5 views)
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Old 5th May 2021, 08:04 AM   #14
Lojzek is offline Lojzek  Croatia
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Buzzliteyear,

did you have a specific budget in your mind? Is there an electricity source at your cabin?
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Old 5th May 2021, 08:24 AM   #15
Buzzliteyear is offline Buzzliteyear  New Zealand
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stv, great links thanks......remember its a 12 dollar board so I guess I should not be expecting alot.
its still on its way from china

Im still not sure about my speaker box if all the drivers could be placed inside and work ok....
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Old 5th May 2021, 08:34 AM   #16
Buzzliteyear is offline Buzzliteyear  New Zealand
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@Lojzek, the drivers I have been looking at are below: not including the 2.1 ebay amp @12 bucks nzd
$12.00 6.5" full range Wide Range PA Loudspeaker - 16.5cm / 6.5 Inch 50Watts RMS - 8 ohm - Sale Price !! - Sound Division & Surplustronics
$30.00 10" bass Polypropylene Cone Hi Fi Woofer - 10 Inch 125 Watt RMS - 8 Ohms - Sale Price !! - Sound Division & Surplustronics
$7.50 7" tweeter Piezo Horn Tweeter - 7 Inch x 3 Inch 150 Watts - Sound Division & Surplustronics
So about 61.50 NZD which is about 44 dollars usd not including the wooden enclosure,
yes there is 240 volts in the shed a
So maybe 100usd for the lot
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Old 5th May 2021, 08:56 AM   #17
stv is offline stv  Europe
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... you also need a DC power supply between 12-24 volts, a "laptop-brick" with 19 V and around 5 A should work.
with the TSP of your speakers you will be best off with separate closed enclosures for the 6,5" and one closed (or even bass reflex, this will produce a small bass hump) enclosure for the 10" woofer.

Last edited by stv; 5th May 2021 at 09:00 AM.
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Old 5th May 2021, 11:56 AM   #18
Lojzek is offline Lojzek  Croatia
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Quote:
Originally Posted by Buzzliteyear View Post
...So maybe 100usd for the lot
I see, there is no available datasheet with basic measurements for any of the drivers, so we are left with nothing to hold on to but utter guessing. I thought if there were any graphs, a passive x/o ( hp and lp) for midrange and hp for tweeter might have been simulated. Woofer is covered by an active lp filter onboard.
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Old 5th May 2021, 08:32 PM   #19
Buzzliteyear is offline Buzzliteyear  New Zealand
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@stv yes they are cheap or free here

@Lojzek I have email the company and asked
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