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Old 24th March 2012, 02:02 PM   #1
wwenze is offline wwenze  Singapore
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Default Badly-designed cheap product strikes again

I opened up this portable speaker with the intention of converting into a passive one,

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It is a mono speaker that accepts 3.5mm stereo input. I couldn't see clearly the different solder joints for the red and white input wires, so I looked at the bottom of the PCB,

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And I realized that I didn't see wrong, the red and white wires are indeed connected together. A quick check by the meter confirms it to be the case.

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Pardon the zero error of the cheap meter.

Would it have cost them too much to include two more resistors? Luckily I haven't connected it to a headphone amp, or I'd be even more mad if something of mine did spoil.
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Old 24th March 2012, 04:17 PM   #2
adason is offline adason  United States
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normal practice
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Old 24th March 2012, 08:07 PM   #3
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Quote:
Originally Posted by wwenze View Post
I opened up this portable speaker with the intention of converting into a passive one,

Pardon the zero error of the cheap meter.

Would it have cost them too much to include two more resistors? Luckily I haven't connected it to a headphone amp, or I'd be even more mad if something of mine did spoil.
The zero error is often just the lead and connection resistance. Some meters allow you to do an offset adjustment. The important issue is that you recognize the difference.

It has been a long time since anyone effectively sold a small amplifier that could not tolerate the two channels shorted into one. Some one can insert a mono plug and short the right output or even put the plug in 1/2 way and short both. So a robust output is required to prevent lots of warranty failures.

Yes once opening up a three way speaker was fun. The woofer was fine. Terminals on the midrange driver but no voice coil. The tweeter didn't even have terminals!
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Old 25th March 2012, 07:03 AM   #4
djQUAN is offline djQUAN  Philippines
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and it even appears that the red and white wires are soldered together connected to the ground plane while the 'shield' wire is connected to the signal input of the amp.
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Old 27th March 2012, 12:41 PM   #5
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On a similar note I have a real cheap tweeter that uses an electrolitic cap
as the high pass trouble is its not a bipolar electrolitic just a standard electrolitic....
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Old 27th March 2012, 12:52 PM   #6
marce is offline marce  United Kingdom
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Just how much where the portable speakers, out of interest.
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Old 27th March 2012, 04:41 PM   #7
wwenze is offline wwenze  Singapore
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Originally Posted by marce View Post
Just how much where the portable speakers, out of interest.
Lucky draw(?) prize of my brother during a dinner of his.
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Old 27th March 2012, 10:17 PM   #8
marce is offline marce  United Kingdom
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Bargain basement then, and you get a free headphone amp.
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