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Old 5th December 2014, 01:47 PM   #1
IO390 is offline IO390  United Kingdom
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Default Some more really small amps

So I recently put some of these up for sale: Really really small TPA3132 amp

And people seemed happy with them. I've had some requests to build some more, so I've done another batch. It's the same size, but has full L-C output filters to help reduce EMI output. Due to the inductors being used, I didn't have room for screw terminals, so they were replaced with 100th headers. You can either just use normal female header sockets for low power applications, although I recommend simply soldering to the connectors.

They sound nice, great detail and very clear. They have tighter bass than the previous version with ferrite beads, which had a "deeper" sound. But this is certainly an improvement I think, and I've been using one instead of main amp (which is about 10x the size and weight). Anyway, I'm offering it with either 20dB or 32dB gain. The 20dB option has slightly lower rolloff, and seemingly better detail but I can't be sure. I'd recommend the 20dB option for home use, and 32dB for portable speakers.

Please note, as I didn't make it clear enough in the previous thread, that one must not expect 50 "usable" watts. At this power level, the THD rises enormously, and is basically unusable. However, one can expect 10 real watts (8 ohms) without problems. For more info, please consult the TPA3132 datasheet.

Also, it does actually run fine on 5V. Don't expect much power output though.

Note: only two left, so please don't order more than two. I have another 10 boards which will be populated shortly.
To make things easier, they are available (with full specs) at my bigcartel shop: IO390's stuff 50W amplifier V2

Some pictures:

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Some size comparisons:

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Last edited by IO390; 10th December 2014 at 12:04 PM.
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Old 5th December 2014, 02:26 PM   #2
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Quote:
Originally Posted by IO390 View Post
They have tighter bass than the previous version with ferrite beads, which had a "deeper" sound.
Yup, that's the sound of ferrite, IME/IMO the spoiler for class D amplifiers.
Ditto, ferrite cored crossover inductors.
Nice design/implementation.

Dan.
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Old 5th December 2014, 02:31 PM   #3
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That sure is a cute little amp. Makes me want to build some sort of project around it.
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Old 5th December 2014, 03:51 PM   #4
von Ah is offline von Ah  United States
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That looks great. Nice work! However, this thread should go in the commercial section of the forum.
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Old 5th December 2014, 04:12 PM   #5
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Indeed. It probably should.
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Old 5th December 2014, 04:14 PM   #6
IO390 is offline IO390  United Kingdom
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Good point. Could a mod please move it for me? Or should I delete it and make a new one?
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Old 7th December 2014, 01:56 PM   #7
von Ah is offline von Ah  United States
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A moderator will move it when they get a chance, I'm sure. I don't think you need to delete the thread. If you haven't already, you can click the red triangle 'report' icon under your username on the left side to call their attention to your last post.
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Old 7th December 2014, 02:14 PM   #8
IO390 is offline IO390  United Kingdom
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Cheers. Well I already started a new post in the "Vendors Bazaar" section, so if I hear nothing from a mod I'll go ahead and delete this one. Or perhaps I can edit the OP and just make it a thread regarding the TPA3132.
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Old 7th December 2014, 03:18 PM   #9
xrk971 is online now xrk971  United States
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Very nice work! Those sure are cute and would be great in almost any portable app. This would be one heck of a headphone amp (5v supply) for someone wanting to make their own cans using 2in fullrange drivers! Vifa TC6FD hmm....

What does shipping to US cost?

Last edited by xrk971; 7th December 2014 at 03:24 PM.
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Old 7th December 2014, 03:38 PM   #10
IO390 is offline IO390  United Kingdom
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Originally Posted by xrk971 View Post
Very nice work! Those sure are cute and would be great in almost any portable app. This would be one heck of a headphone amp (5v supply) for someone wanting to make their own cans using 2in fullrange drivers! Vifa TC6FD hmm....

What does shipping to US cost?
Thanks for the kind words

Shipping to the US is 3.50 ($5 roughly) for 5-7 day. Anything quicker is a lot more expensive. Info on shipping is on my shop page.
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