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Class D Switching Power Amplifiers and Power D/A conversion

SystemD_2kW, any interest for an open design?
SystemD_2kW, any interest for an open design?
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Old 21st July 2015, 06:23 PM   #491
ChocoHolic is offline ChocoHolic  Germany
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Quote:
Originally Posted by DjLeco View Post
Maybe in bridge mode.
Yup, bridged mode is the head line of posting #431.
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Old 21st July 2015, 09:25 PM   #492
fireworks is offline fireworks  Switzerland
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ChocoHolic,

What scopes did you use for the waveforms ? One is a USB scope. What is the one you used in your images of its screen ?
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Old 21st July 2015, 09:26 PM   #493
fireworks is offline fireworks  Switzerland
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Also,

Since the design is fully documented, can we buy such an amplifier on Ebay from Chinese sellers ?
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Old 22nd July 2015, 09:52 AM   #494
DjLeco is offline DjLeco  Romania
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SystemD_2kW, any interest for an open design?
Quote:
Originally Posted by ChocoHolic View Post
Yup, bridged mode is the head line of posting #431.
Ok that's correct power for bridge mode.
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Old 22nd July 2015, 06:22 PM   #495
ChocoHolic is offline ChocoHolic  Germany
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Quote:
Originally Posted by fireworks View Post
ChocoHolic,

What scopes did you use for the waveforms ? One is a USB scope. What is the one you used in your images of its screen ?
The USB scope is the cheapy USB2100.
The other one is the old Iwatsu TS-8500, 500MHz.
For building and getting it going almost any USB scope will be fine.
A fast scope is only necessary for the development and judging switching wave forms and taming HF-resonances.


Quote:
Originally Posted by fireworks View Post
Also,

Since the design is fully documented, can we buy such an amplifier on Ebay from Chinese sellers ?
Most likely it is unattractive for commercial sellers.
Assembling the PCB and mechanical set up is no fun for mass production. Design focus was clearly on DIY for few pieces.
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Old 12th January 2017, 06:54 PM   #496
stewin is offline stewin  Kenya
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hi all where is everybody???
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Old 10th August 2017, 01:28 AM   #497
ravpreet420 is offline ravpreet420
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Hi choco
Need your help
First of all thanks for good design.
Sir can use voltage +/-120 for this design,all caps changed accorrding to voltage
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Old 11th August 2017, 08:00 PM   #498
ChocoHolic is offline ChocoHolic  Germany
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Above +/-85V reliability will decrease.
At +/-100V multiple components will touch their absolute maximum ratings,
or already slightly exceed their absolute max ratings due to switching transients. Caps, MosFets, diodes, IR-chip...
+/-120V would be a reckless starting point in order to make a youtube video 'how I killed my amp'.
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Old 5th October 2017, 01:13 PM   #499
ionutgaga is offline ionutgaga
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1.ChocoHolic has exceeded their stored private messages quota and cannot accept further messages until they clear some space.
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Old 11th October 2017, 04:17 PM   #500
kartino is offline kartino  Indonesia
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Hi Coco,

90Vdc supply should be fine to drive most common 18" sub.
I am not a scientist like you but my fullbridge UcD discrete and fullbridge from IR based design both work very well. That is with 200V mosfet. With 250V mosfet have been tested as well at.115Vdc without problem.

Sometimes people too afraid working in the limit
But really a lot.of people are waiting a monster from you.
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