Simple Class D Amplifier

[Tekko]

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

[Tekko]

A video: Clocked Class D amplifier - YouTube

[Bare]

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

[AP2]

Hi,
i see a big unlinearity on blue wav up side.

[Tekko]

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]

Nice circuit, can you scope triangle oscillator output.

[Tekko]

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

[apexaudio]

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]

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]

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