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Old 26th August 2012, 12:10 PM   #1
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Default Simple Class D Amplifier

This is a circuit i came up with this morning, i have just finished building it and it turns out it works well above expectation.

I'm running it from 2x35VDC and the fets(IRFP450) is not even getting warm.

Schematic: http://i.imgur.com/giy22.png
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Old 26th August 2012, 03:39 PM   #2
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A video: Clocked Class D amplifier - YouTube
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Old 26th August 2012, 04:09 PM   #3
Bare is offline Bare  Canada
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A combo between Rube Goldberg and Gyro Gearloose.. both would be proud :-)
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Old 26th August 2012, 04:20 PM   #4
AP2 is offline AP2  Italy
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Hi,
i see a big unlinearity on blue wav up side.
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Old 26th August 2012, 07:50 PM   #5
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It's a child in growth pains, i havent dealt with these triangular wave oscillators in a looong time so im mostly getting sine waves out, maybe LM4562 isent a particularly good choice, even though im only asking it to oscillate at around 100kHz.
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Old 26th August 2012, 08:25 PM   #6
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Nice circuit, can you scope triangle oscillator output.
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Old 27th August 2012, 03:35 PM   #7
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I did, and it was a mix between a triangular wave and a sine wave.
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Old 27th August 2012, 04:14 PM   #8
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Quote:
Originally Posted by Tekko View Post
I did, and it was a mix between a triangular wave and a sine wave.
You can try triangle oscillator from JBL 200kHz with single OP (1/2 TL072).
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File Type: jpg Triangle 200kHz.JPG (48.1 KB, 642 views)
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Old 27th August 2012, 07:44 PM   #9
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That, or rework thed values of the resistors in the existing circuit, i lean toward the latter as i doubt i have any 5.6V zeners, i have 7.5V, 10V and i think 12 and 15V.

That jbl circuit kinda reminds me of the circuit of a relaxation oscillator.
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Old 28th August 2012, 07:51 PM   #10
stewin is offline stewin  Kenya
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hi tekko what are the harmonics of your amp ? have you tried hv like +/-80vlts?
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