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TPA3255 Reference Design Class D Amp GB
TPA3255 Reference Design Class D Amp GB
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Old 25th August 2019, 09:49 PM   #81
manudrz is offline manudrz  France
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Originally Posted by xrk971 View Post
We will provide a single-click to order shopping cart for the BOM from Mouser. Vacuphile has offered to assemble the shopping cart as a Beta tester. Kay Pirinha has also offered to be a Beta tester.

Nice! I think we all know it's not a cheap project (you have ebay for that), but that amp is intend to play for years so lets go on...
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Old 26th August 2019, 12:52 AM   #82
xrk971 is offline xrk971  United States
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TPA3255 Reference Design Class D Amp GB
More than just last for years - features are now available that are not to be found on the cheap Chinese amps, and the performance should be better with good components and careful layout. Parts cost probably $80 to $120 depending on quantity. We won’t know until Vacuphile makes the shopping cart on Mouser.
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Old 26th August 2019, 02:10 AM   #83
blossom is offline blossom  New Zealand
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What about adjustable gain on the inputs for when used in multi way applications? To keep the noise floor low on things like compression drivers.... ????
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Old 26th August 2019, 01:09 PM   #84
xrk971 is offline xrk971  United States
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TPA3255 Reference Design Class D Amp GB
You can adjust the input gain by varying the resistors on the analog input stage balanced pre section - although not sure how much range there is to do that without it affecting other aspects. It is unity gain at present. This amp has 22dB gain and if people want to drive it to clip with normal line level signals, an 8dB to 10dB preamp for volume control would be useful.

The PCBs are suposed to arrive today.
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Old 26th August 2019, 10:03 PM   #85
xrk971 is offline xrk971  United States
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TPA3255 Reference Design Class D Amp GB
The PCBs are in - they look great! Thank you, JPS64!

TPA3255 Reference Design Class D Amp GB-tpa3255-pcb-photo-01-jpg

TPA3255 Reference Design Class D Amp GB-tpa3255-pcb-photo-02-jpg

TPA3255 Reference Design Class D Amp GB-tpa3255-pcb-photo-03-jpg
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Old 27th August 2019, 07:58 AM   #86
blossom is offline blossom  New Zealand
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Looking good!

How many Hours would you say is in soldering one of these boards? For a beginner?
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Old 27th August 2019, 11:08 AM   #87
xrk971 is offline xrk971  United States
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TPA3255 Reference Design Class D Amp GB
Assuming the beginner practices solder paste and hot air / hot plate soldering technique on test board first and can successfully solder 0603 parts and larger electrolytic SMT caps, maybe 4-6 hours. The self “training” on test boards is probably 2-3hrs.

You need a $40 hot air SMT rework tool. A $10 skillet, a $10 dorm room hot plate, $15 IR thermometer, $15 syringe of solder paste, $20 SMT tweezers, $10 magnifying flip up goggles, liquid flux $10, solder braid $3, and regular soldering iron. Those are the bare minimum tools and supplies needed to solder this yourself.

More tips here:
Making balanced output from single end

This is how I soldered this board:
Click the image to open in full size.
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Last edited by xrk971; 27th August 2019 at 11:14 AM.
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Old 27th August 2019, 12:50 PM   #88
doctormord is offline doctormord  Germany
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Hmm, soldering big inductors on 2mm 2oz. copper pcb might be a challenge with just using a hot air gun. You'd probably need to preheat the pcb as well. (Or solder them with an iron and leave out the mounting tab)


Btw. You have Conformité Européenne documents available, as indicated by "CE" on the PCB?

Last edited by doctormord; 27th August 2019 at 12:52 PM.
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Old 27th August 2019, 02:18 PM   #89
xrk971 is offline xrk971  United States
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The large parts like inductors and electrolytics need a hot plate preheat from bottom and hot air from the top.
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Old 27th August 2019, 03:42 PM   #90
xrk971 is offline xrk971  United States
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TPA3255 Reference Design Class D Amp GB
Dr Mord,

The CE label is just that, a label on the PCB. For the device to be CE certified for commercial sales, it has to go through CE testing of course.

Your 1200w DC-DC boost converter looks interesting are those sold as finished and tested units? How much does 1 cost?
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