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Tekko 26th August 2012 12:10 PM

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.


Tekko 26th August 2012 03:39 PM

A video: Clocked Class D amplifier - YouTube

Bare 26th August 2012 04:09 PM

A combo between Rube Goldberg and Gyro Gearloose.. both would be proud :-)

AP2 26th August 2012 04:20 PM

i see a big unlinearity on blue wav up side.

Tekko 26th August 2012 07:50 PM

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.

apexaudio 26th August 2012 08:25 PM

Nice circuit, can you scope triangle oscillator output.

Tekko 27th August 2012 03:35 PM

I did, and it was a mix between a triangular wave and a sine wave.

apexaudio 27th August 2012 04:14 PM

1 Attachment(s)

Originally Posted by Tekko (
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).

Tekko 27th August 2012 07:44 PM

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.

stewin 28th August 2012 07:51 PM

hi tekko what are the harmonics of your amp ? have you tried hv like +/-80vlts?

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