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
I'm running it from 2x35VDC and the fets(IRFP450) is not even getting warm.
Schematic: http://i.imgur.com/giy22.png
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).
Attachments
My plan was to use a 50A 600V IGBT module for the output stage, i alrready tried this an d on 2x38VDC and 500kHz, the module with no heatsing only got slightly warm, the audio part dident worth though as i tried it with transformer coupled gate drive.
I'll resume the work on this this weekend, and i will socket the IR2110 so it can be easily replaced when needed.
I'll resume the work on this this weekend, and i will socket the IR2110 so it can be easily replaced when needed.
The old igbts were slow, the modern ones are almost as fast as mosfets.
As i said i ran a modern fairchild transfer molded igbt halfbridge module(http://www.fairchildsemi.com/ds/FP/FP7G50US60.pdf) at 500kHz with 2x38VDC and it only got slightly warm just laying on the table, and that with lousy transformer gate drive and no heatsink.
As i said i ran a modern fairchild transfer molded igbt halfbridge module(http://www.fairchildsemi.com/ds/FP/FP7G50US60.pdf) at 500kHz with 2x38VDC and it only got slightly warm just laying on the table, and that with lousy transformer gate drive and no heatsink.
A new video: Feedbackless class d amp pounding it - YouTube
Rail voltages are now 2x60V, but for some reason 30-35V is the max i can get out, even when its clipping and hitting the rails.
The fets remain barely warm to the touch.
Rail voltages are now 2x60V, but for some reason 30-35V is the max i can get out, even when its clipping and hitting the rails.
The fets remain barely warm to the touch.
You can try triangle oscillator from JBL 200kHz with single OP (1/2 TL072).
Good evening.
You can send me the complete layout of this amplifier?
Thank you.
luizcpimenta@yahoo.com.br
luizcpimenta@gmail.com
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