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Class D Switching Power Amplifiers and Power D/A conversion

ucd 25 watts to 1200 watts using 2 mosfets
ucd 25 watts to 1200 watts using 2 mosfets
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Old 1st July 2020, 12:09 AM   #4801
stewin is offline stewin  Kenya
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hello everyone
i am building the below amp based on this thread , but i will put two daughter boards, one for the protection board and the other for the amp ucd drive.

i will change the protection to manoj aud600 protection cause it was the only effecient and effective i have ever came across so far.

The other daughter board for ucd protection will be able to change from discreet to ic version or even sigma delta mode , by just changing the board.

opinions and ideas are highly welcomed and appreciated.
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File Type: pdf gtG ucd non discreet 3.5 smd schematic.pdf (42.4 KB, 57 views)
File Type: zip gtG ucd non discreet 3.5 smd.zip (199.8 KB, 42 views)
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Old 3rd July 2020, 06:04 PM   #4802
kartino is offline kartino  Indonesia
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Hi Stewin,
Is the amp now robust, free from suddenly dead?
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Old 4th July 2020, 01:42 AM   #4803
stewin is offline stewin  Kenya
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Quote:
Originally Posted by kartino View Post
Hi Stewin,
Is the amp now robust, free from suddenly dead?
hi kartino, thanks for the reply , i have watched many of your videos and they have motivated me to re visit this amp. i will make it to use two daughter boards , i will change them just by socketing them. both daughter boards will be ucd . one will be with ic (lm311 , ir2110 ) other driver will be discreet with opamp.
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Old 5th July 2020, 12:22 AM   #4804
norazmi is offline norazmi  Malaysia
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you still playing with lm311 stewin?
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Old 6th July 2020, 08:18 PM   #4805
stewin is offline stewin  Kenya
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ucd 25 watts to 1200 watts using 2 mosfets

yes sir , i found it stable with ucd ir2110 than sigma with cd4049
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Old 8th July 2020, 02:10 AM   #4806
norazmi is offline norazmi  Malaysia
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any driver that can stabilize with ir2110 usually logic gate or nand would be nice to be use, cd 4049 is good but little bit hot with high speed, but ive found that 7hc00n super cool with high fsw speed, supply only just 5vdc, you can refer to Apex design class D, follow hes schema for driver 7hc00n, for the input you can choose any, such as single op amp, lm311, tl494 or else, i have tl494 + 74hc00n + ir2110 very stable, its super clean and smooth and easy self osc class D, running test fsw 265khz with irfb4227. i have video i will upload on youtube later.
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Old 8th July 2020, 02:20 AM   #4807
norazmi is offline norazmi  Malaysia
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well here is the video... enjoyyyyyyy

YouTube
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Old 8th July 2020, 02:23 AM   #4808
norazmi is offline norazmi  Malaysia
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is this amp have gain correction? YES this amp having feedback 56k after LPF
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Old 8th July 2020, 10:01 AM   #4809
stewin is offline stewin  Kenya
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Quote:
Originally Posted by norazmi View Post
any driver that can stabilize with ir2110 usually logic gate or nand would be nice to be use, cd 4049 is good but little bit hot with high speed, but ive found that 7hc00n super cool with high fsw speed, supply only just 5vdc, you can refer to Apex design class D, follow hes schema for driver 7hc00n, for the input you can choose any, such as single op amp, lm311, tl494 or else, i have tl494 + 74hc00n + ir2110 very stable, its super clean and smooth and easy self osc class D, running test fsw 265khz with irfb4227. i have video i will upload on youtube later.
hi norazmi , very good build , i see you have put buffers after ir2110 . nice highs , please provide the schematic you used ,

also what voltage did you use and did you try to remove the speaker while the amp is playing?
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Old 8th July 2020, 06:57 PM   #4810
norazmi is offline norazmi  Malaysia
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Stewin to give you evidence that my amp is immune with speaker or without speaker its safe to change speaker while its playing, the oscillating never failed, ill put video to demonstrate you while playing audio i will pull the speaker terminal off for few secs maybe 10-20 secs then put it back
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