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Class D Switching Power Amplifiers and Power D/A conversion

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Old 16th December 2011, 11:14 PM   #1581
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If you conect in short pins for KTY sensor, protection shuld turn of raley.. Maybe your sesnor is not good..

Do you try cliping indicator with AN6884? (top of schematic)
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Old 17th December 2011, 08:15 AM   #1582
stewin is offline stewin  Kenya
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no i did not use clipping indicator but i am going to do so .on the over temp issue i used a 0.1 ohm resistor when i connect it the led does not light but when i disconnect it the led lights and relay does not go off . here is my part of the schema
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Old 17th December 2011, 04:28 PM   #1583
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You have two mestakes because of me ) sorry for that

R57 have to be 47ohms not 47K
and R54 have to go on base of T5 not to emitter
C39 stays where he is bettwen R54 and ground with inverted polarity because of negativ voltage after D17

Sorry, my mestake
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Old 17th December 2011, 04:37 PM   #1584
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Here you are original schematic...

if you interested, i can send you and over current prot
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Old 19th December 2011, 12:27 AM   #1585
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Default output inductor

Click the image to open in full size.Click the image to open in full size.

guys here is an example of output inductor use in class d amp
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Old 7th January 2012, 08:40 AM   #1586
fibko is offline fibko  Slovakia
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almost complete
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Old 7th January 2012, 09:42 AM   #1587
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Good work fibko! Looks very nice!
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Old 10th January 2012, 04:33 PM   #1588
stewin is offline stewin  Kenya
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wow nice work how many watts is the smps?
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Old 12th January 2012, 09:21 AM   #1589
fibko is offline fibko  Slovakia
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It is 1kW SMPS (2 ​​kW peak). Inspiration comes from K6 amplifier K6 700 Watt Audio Amplifier and Switching Power Supply with a few changes and own design pcb.
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Old 12th January 2012, 04:33 PM   #1590
stewin is offline stewin  Kenya
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did you use t-106 26 for transformer gate drive? did you include the over current protection in the smps?
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