DIY solar powered-battery powered-mp3-mini boombox thingy - diyAudio
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Old 18th June 2014, 10:57 PM   #1
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Default TPA6017 DIY solar powered-battery powered-BABBLE BOX

To all:

Im trying to roll my own mini boombox, solar with battery backup power. I have some speakers that I want to repurpose, but have a couple questions.

1. The speakers are from a herman miller babble unit. These were some sort of voice masking device for offices, so Im not sure if the speakers will be adequate or the proper type. See pics for the front of the speakers and the back, with specs.

2. The speakers are both powered with an individual amp board inside each speaker, I think they are based on the TPA6017 chip, but Im not sure, as Im not very familiar with audio stuff, but just enough to be dangerous.
(Can I even use this amplifier/circuit to drive the speakers to a proper level for normal use?) See pics attached, for the amp circuit board.

3. I checked the pins coming from the main head unit and it seems to have 6 wires going to it, which I think are two for +5vdc for power, and the other 4 for audio signal, I think, but not sure if they are seperate for high/low frequencies or what, since this is new to me, I have no idea. Looking for some guidance on this. The boards use a phone style plug connection for the wires on the amp, hence the "phone" connectors on the amp circuit board.

I have a very rough hand drawn diagram of how I think I will need to wire it. I have a (SP) solar panel, with a SLA battery and a usb charging circuit to go from 12vdc to 5vdc for the amp boards. Please let me know if this will work or just shoot holes in my plans so I can put it together right and make it work. I just plan on using an ipod/phone to run audio to it.

Thoughts?

Last edited by thetonywarren; 19th June 2014 at 02:36 PM. Reason: Named project "Babble Box"
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Old 19th June 2014, 12:39 AM   #2
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Default Pics

Here's the pictures, not sure why they didnt show up on the first post.
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Old 19th June 2014, 02:47 AM   #3
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Does your solar panel have a regulator in it? Unless you have a large capacity battery, and a small power panel, then you will need a regulator of some kind, otherwise the battery can overcharge.

You should also see if the 12V-5V regulator has a low voltage cutout feature, otherwise you run the risk of over-discharging your battery and killing it.
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Old 19th June 2014, 12:21 PM   #4
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the battery is a 12vdc 7ah SLA battery. Im not sure on the solar panel yet, probably will go with a small 1.5w solar panel, similar to this.
1.5 Watt Solar Battery Charger
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Old 19th June 2014, 01:51 PM   #5
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Am I correct in stating that the TPA6017 is an AB class amplifier IC? Im not sure if this is in the right forum or not. Please let me know if I have put it in the wrong place.
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Old 19th June 2014, 03:49 PM   #6
gmarsh is offline gmarsh  Canada
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Correct, the 6017 is a class AB amplifier.

Honestly, I'd start from scratch on this project. The speakers have unknown parameters, so you can't properly design an enclosure for them. Based on their small size they're probably not all that efficient either - plus if the original application was voice masking, the low end frequency response probably isn't all that great for music listening.

To get started, I'd pick up the following:

- A solar panel - if it's 5 watts or less, you can connect them to a 7aH SLA without worrying too much about overcharging - SLA chemistry will burn excessive charge off as heat.
- A suitable amp that'll run off +12V directly. I'd just buy one off eBay - there's lots of options to choose from, I'd personally snag something based on TI TPA3116. Off the 12V SLA, this will give a peak sine power of ~15W/ch.

For speakers/enclosure, there's a few good designs kicking around - there's a 'Boominator Mini' design which is excellent, but it uses hard-to-get speakers. On the cheapest side of things, which won't be as loud/efficient but still perfectly fine, you could just toss a couple of cheap car audio speakers into an open-backed box.
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Old 19th June 2014, 04:16 PM   #7
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ok, that's great information, thanks for setting me straight on some things. Do you have a link or know a good location for information on the Boominator Mini project?

Thanks!
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Old 27th June 2014, 05:45 PM   #8
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Ive decided to go with a build based on the Paul Carmody Sprite
https://sites.google.com/site/undefinition/sprite
with a few changes/additions.

For the amplifier im going to use the TA2024, seems to be popular and should hopefully work well.

Also adding a bluetooth module so wireless play is available.

Im building a center chamber that will house the amplifier and batteries. Im going to use 2- 7ah 12v SLA batteries to power it as well as a 1.5w solar panel to keep them topped off.

I also want to add a usb charging circuit to it so I can charge devices from the batteries as well. Are there any things I should be aware of , or can I just add a usb charging circuit from a car phone charger?

Anyone have thoughts?
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Old 28th June 2014, 03:16 PM   #9
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My build so far. Making good progress. I used cut list plus for calculating the optimal cuts from sheet goods. Worked well. Not sure how I will be mounting line in, USB charging and dc voltage charger yet. Click the image to open in full size.Click the image to open in full size.[IMG]Click the image to open in full size.[/IMG]
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Old 28th June 2014, 05:54 PM   #10
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Hehe, building a Sprite with double 7.2ah SLA batteries. I like it
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