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Class D Switching Power Amplifiers and Power D/A conversion

Problems with L25D DIY AMPS
Problems with L25D DIY AMPS
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Old 7th February 2018, 10:31 AM   #1
stef33fr is offline stef33fr
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Join Date: Feb 2017
Default Problems with L25D DIY AMPS

I decided to make my amps myself rather than buying brand new ones.
I left on a base of L25D (IRS2092 + IRFB4020PBF) from JLM.
The set will be powered by + - 75V by a custom toroidal transformer , a power supply card and protection HPs.

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Last edited by stef33fr; 7th February 2018 at 12:59 PM.
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Old 7th February 2018, 12:50 PM   #2
stef33fr is offline stef33fr
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After two mounted amps , the third is more recalcitrant ...

The two L25D cards do not light up!
I have dismantled the MOSFETs to test them, it seems that it is correct (although ??)
I measure, with or without MOSFET, -38V on the HP output ...

I'll have to go back to my applied electronics classes! In the meantime, any advice or ideas are welcome.

On the other hand, I read here or there, that it might be wise to connect the GND of my power adapter to the earth of my amp, but I have 100VAC between the two!
For now, my star mass is on the GND of my power supply card, the electrostatic screen of my ring to the ground.

Any advice is welcome.
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Old 7th February 2018, 12:57 PM   #3
stef33fr is offline stef33fr
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Here is the wiring diagram
Attached Files
File Type: pdf Schéma.pdf (533.8 KB, 8 views)
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Old 7th February 2018, 01:03 PM   #4
stef33fr is offline stef33fr
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Here is the wiring diagram
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File Type: png Diagram.png (689.9 KB, 23 views)
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