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Class D Switching Power Amplifiers and Power D/A conversion

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Old 7th April 2020, 10:58 AM   #1531
chermann is offline chermann  Austria
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Join Date: Jan 2017
Location: Vienna
Thanks guys


i will try the get a 800D for testing... power is not so important at home. i interesting is excellent SQ.
chris
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Old 7th April 2020, 11:58 AM   #1532
daniboun is offline daniboun  France
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Join Date: Nov 2019
Location: Lyon (France)
Quote:
Originally Posted by chermann View Post
Thanks guys


i will try the get a 800D for testing... power is not so important at home. i interesting is excellent SQ.
chris
You can take however take a look here for the Pascal S-PRO2 board :

Signal To Noise-Ratio > 120 dB (A-weighted, 20 Hz - 20 kHz, 8 Ω load)
THD+N (typical) < 0.05 % (20 Hz - 20 kHz, 8 Ω load, 3 dB below rated power) that is very good )

S-PRO2 - Pascal Audio
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Old 7th April 2020, 10:43 PM   #1533
Pygmy is offline Pygmy  Netherlands
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Location: Haarlem
Work in progress - bought the alu case with specific components in mind, then changed my mind about the components and the new components take a it more space :-)

Now I'll try to make everything fit and see if it works out - if it doesn't (EMI?) I'll have to quote Jaws : "We're going to need a bigger boat" :-)

Click the image to open in full size.

Last edited by Pygmy; 7th April 2020 at 10:45 PM.
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Old 8th April 2020, 06:53 AM   #1534
daniboun is offline daniboun  France
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Quote:
Originally Posted by Pygmy View Post
Work in progress - bought the alu case with specific components in mind, then changed my mind about the components and the new components take a it more space :-)
Now I'll try to make everything fit and see if it works out - if it doesn't (EMI?) I'll have to quote Jaws : "We're going to need a bigger boat" :-)
What about the Amplifier board and PSU ? It seems to be a Sure / Wondom board ?
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Old 9th April 2020, 08:01 PM   #1535
Pygmy is offline Pygmy  Netherlands
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Join Date: Jul 2016
Location: Haarlem
Quote:
Originally Posted by daniboun View Post
What about the Amplifier board and PSU ? It seems to be a Sure / Wondom board ?
The amp board is a Sure/Wondom ab35281 board:
Sure Electronics AA-AB35281 3x200W Class D Audio Amplifier Board - T-Amp

The power supply is a Connex SMPS600RS:
SMPS600RS | Connex Electronic

This is my second DIY amp, learning as I go along so any insights / warnings / tips are greatly appreciated :-)
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Old 10th April 2020, 04:41 PM   #1536
3kes is offline 3kes  Netherlands
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Join Date: Mar 2018
Location: Alphen a/d Rijn
So I had the Hifimediy T4 laying around for a long time. After building a couple of Pass amps I was curious about the sq of this board.

I always first build an amp on a piece of wood before begin the struggle of building it inside a high end case.

Because I had the parts for a linear psu I first used one big capacitor after the rectifier. The sq was okay, not more than that. Today I made a CLCRC filter and fired it up. Now itís a whole different amp. Sounding much better, more detailed, more open.

Not sure it will stay but for now Iím going to listen to it for a while. In the meantime I also ordered the 3e audio tpa3255 board so thatís going to be the next experiment.
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Old 12th April 2020, 11:48 PM   #1537
Pygmy is offline Pygmy  Netherlands
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Join Date: Jul 2016
Location: Haarlem
Hi peeps,
just a side question - when mounting a SMPS in an alu case - what's the smart way to go about it?

Minimum 5mm standoffs - better 10mm?
Insulation material between the board and the case?

Just wondering what the safest way is to go about my 1st build..
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Old 13th April 2020, 03:43 AM   #1538
Douglas Blake is offline Douglas Blake  Canada
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Join Date: Nov 2019
Location: Niagara Region Ontario
Quote:
Originally Posted by Pygmy View Post
Minimum 5mm standoffs - better 10mm?
Insulation material between the board and the case?
Yes on both counts.

Take apart the power supply from a PC and have a look how it's done. That would be the "el-cheapo minimum" for you to follow.
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Old 13th April 2020, 06:20 AM   #1539
3kes is offline 3kes  Netherlands
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Join Date: Mar 2018
Location: Alphen a/d Rijn
Quote:
Originally Posted by Pygmy View Post
Hi peeps,
just a side question - when mounting a SMPS in an alu case - what's the smart way to go about it?

Minimum 5mm standoffs - better 10mm?
Insulation material between the board and the case?

Just wondering what the safest way is to go about my 1st build..
Better safe then sorry, I wouldn’t feel save with 5mm without any isolation. Cheap PCB’s can bent easily because of the weight of the components after a while.
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Old 13th April 2020, 09:58 AM   #1540
ElliJ is offline ElliJ  United Kingdom
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Join Date: Jan 2020
Location: Hampshire
My Douk SMPS is mounted on the heat sink with 5mm standoffs but has some sort thin of insulation between the two. It is very close and only has about 1mm clearance in places.I know Pigmy has a different SMPS but he should go for 10mm and then check the clearance.
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