Hi,
Here's a miniature amp design I've been working on based on the TPA3132. Board size is 25x38mm (1"x1.5"), with holes to accept M3 mounting screws.
Input and output terminals are 100th (2.54mm) headers. One can either source some female header sockets with a sufficient current rating, or just solder to the terminals directly. Inputs are single-ended.
They sound nice, great detail and very clear. They have bootstrap snubbers, among other mods from the standard design. 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 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.
They are available (with full specs) at my bigcartel shop: IO390's stuff - 50W amplifier V2
Price is £21.99, shipping to the UK is Royal Mail 1st class (93p), everywhere else is £3.50. Shipping to EU is 3-5 day, everywhere else is 5-7 day. For faster shipping options, please contact me.
Some pictures:
Instruction manual is attached.
Here's a miniature amp design I've been working on based on the TPA3132. Board size is 25x38mm (1"x1.5"), with holes to accept M3 mounting screws.
Input and output terminals are 100th (2.54mm) headers. One can either source some female header sockets with a sufficient current rating, or just solder to the terminals directly. Inputs are single-ended.
They sound nice, great detail and very clear. They have bootstrap snubbers, among other mods from the standard design. 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 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.
They are available (with full specs) at my bigcartel shop: IO390's stuff - 50W amplifier V2
Price is £21.99, shipping to the UK is Royal Mail 1st class (93p), everywhere else is £3.50. Shipping to EU is 3-5 day, everywhere else is 5-7 day. For faster shipping options, please contact me.
Some pictures:
Instruction manual is attached.
Yowza, that is small! Do you have gain/phase margin numbers throughout the audio/power band? My concern with so little capacitance is current limiting, what power supply did you use upstream?
I don't have the necessary equipment to make proper measurements, but from what I can tell, they are on par with/slightly better than the datasheet figures, which are made using the EVM (which has a sloppy layout).
PSU for the max 50W output was a big beefy lab PSU, set to 24V and the thing was drawing about 4A. I run it usually from a 15V laptop SMPS rated at 3A, and that works well.
PSU for the max 50W output was a big beefy lab PSU, set to 24V and the thing was drawing about 4A. I run it usually from a 15V laptop SMPS rated at 3A, and that works well.
That was 50W peak at 26V supply, with a 1KHz sine wave input, 4 ohm resistor load.
I added a blob of thermal grease to the top of the IC, and taped on the end of my standard DMM thermocouple (so not entirely accurate). I decided to quit after the temp got to 100C, which it did in under a minute.
As stated above, it sounds like crap at these levels anyway.
