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Class D Switching Power Amplifiers and Power D/A conversion

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Old 20th August 2017, 12:34 AM   #91
K-amps is offline K-amps  United States
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I already have power supplies for this project. Very nice encapsulated toroids... I might consider the Sure kit... I currently dont have the bandwidth in time to tackle this. I need to set up my HT quick...
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Old 1st February 2018, 09:20 PM   #92
Ivanovv is offline Ivanovv  Macedonia
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Default Resetting issue

Originally Posted by nigelwright7557 View Post
I only found a problem if I attached the scope probe after it was switched on.
If you attach the scope probe first then switch it on it will be ok.

I spent a long time learning about the 2092. It took me 3 pcb revisions before I got one that didn't reset on high power output.
My decoupling and pcb layout was poor.
The output mosfets need close decoupling and also need snubbers.
The 2092 needs decoupling close too.
Nigel can you help me with my issue on l30D. It worked well now start to reset on half the power. On dc+ rail measuring above 1.4Amp is resetting. How did you fix the resetting issue? Everything else is working well ( except the heating but I am using forced colling and its ok ).
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Old 1st February 2018, 10:38 PM   #93
nigelwright7557 is offline nigelwright7557  United Kingdom
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I found I had to spend a bit of time getting over current detect circuits to work at high powers. Increase the resistors to get a higher over current detect limit. See datasheet for resistor values.
I also found driving mosfets with high gate capacitance needed low value gate resistors, as low as 4r7. I found I could get away with 10r if I used gate driver buffers.

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Last edited by nigelwright7557; 1st February 2018 at 10:46 PM.
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Old 7th February 2018, 03:45 PM   #94
Ivanovv is offline Ivanovv  Macedonia
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Thank you a lot Nigel for this informations but since I am a hobby builder I am kinda lost in a conversation. Can you tell me exactly which component I need to change so I can fix mine. Thanks again for your help
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Old 19th February 2018, 12:03 AM   #95
Greg32 is offline Greg32  Australia
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Ivan can you post a picture of your l30d board so we can see which on you have.
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Old 20th February 2018, 11:16 AM   #96
Ivanovv is offline Ivanovv  Macedonia
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This is the board
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Old 21st February 2018, 10:55 AM   #97
LincolnG is offline LincolnG
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Default What's the difference between l15d-smd and l15d-pro

I actually ordered a pair of L15d-pro kits but was sent the L15d-smd in error. The seller did correct the error and sent the Pro allowing me to keep the smd.

I've tried both, powered on an 500w 50v smps from EBay too.

When looking at these little things you want to try to find a flaw in the sound - but I can't. They seem just as good as my other bi-polar and FET amps, except the power. You can turn the power up and up and up and not a hint of strain in sight.

Today I have these connected to my homebuilt studio monitors based on Monitor Audio drivers. These are 6 ohms with 16cm bass drivers and I have them turned up as loud as I dare.

The smd version sound colder with the top end very transparrent, the pro a little warmer, still crisp - perhaps a little better on bass especially on the lower end.

Despite many searches I cannot find schematics for either of these, however the circuits seem to vary a lot - Can anybody say exactly what are the differences.
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