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Old 31st January 2016, 03:49 AM   #1
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Default Quick questions for wiring mono mini speaker

Say I wanted to build a mini speaker with two drivers... and I wanted to use this: TPA3110 BTL Mono 30W Digital Audio Power Amplifier Board DC 12V 24V Amp Module | eBay little amplifier... and I'd be using a stereo source. Is it the case that 1) I can just gang the left and right channels together into the single input and 2) I can run both drivers from the one output and 3) I can use two 4 ohm drivers and they will be in parallel resulting in a 2 ohm load and 4) this amp will work with a 2 ohm load?

Is this how the wiring is generally done in a "halfinator?" Just checking... thanks...
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Old 31st January 2016, 03:58 AM   #2
adason is offline adason  United States
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1) yes
2) yes
3) not recommended
4) do not know, did not bother to search
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Old 1st February 2016, 04:13 PM   #3
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Thanks for the input.

For some reason I was thinking that all the TPA chips could drive 4 ohm speakers on a single channel and that by using them in bridged mode they would be able to handle 2 ohm load. I see that I was mistaken, though. Maybe the 3116 is the only one that can?

Thanks again.
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Old 1st February 2016, 06:37 PM   #4
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Summing 2 channels into 1 needs series resistance in each line, like 2k2 (in the range 1k-4k7).
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Old 1st February 2016, 07:20 PM   #5
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Thanks! So if I wanted to add a volume control would it be like this?

Click the image to open in full size.
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Old 1st February 2016, 07:25 PM   #6
adason is offline adason  United States
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draw it again with one side of the 50K pot to the ground (not to out +)
and wiper is out (+)
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Old 1st February 2016, 07:33 PM   #7
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I understand. I knew how the pot was supposed to be wired (1st pin to ground, 2nd pin to input, 3rd pin to output) I didn't realize the arrow in the pot symbol actually represented a terminal. Makes sense. Thanks again.
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Old 1st February 2016, 07:41 PM   #8
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Default Quick questions for wiring mono mini speaker

50k is a good source of noise, I'd go for 10k.
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Old 1st February 2016, 08:21 PM   #9
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Appreciate it!
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