Time to do an updated version of my class-d amplifier. Last revision was more of a prototype, with a mother board where all the switching and output filter was placed, and a daughter board where the modulator was placed. This allowed for playing a lot with the modulator, but now it is time to integrate
Read more … Class-D, New revision, New PCBs
Have now tuned the stereo version somewhat.
It’s running 300 kHz, and is able to put out some 150 W in 8 ohm, though I have not tried yet to test it to the limit.
It is build into an old Yamaha box, using a 3 x 35V transformer of a decent size and 2 x 10.000
Read more … Class-d Amp listening impressions
Have had some time to finish a main board more, so soon I’ll have the oppotunity to try the amp out on my stereo set-up.
So soon the truth will come out ….. does this designhave any potential as a full rage amlifier?
I have done some modifications as well. Main point being that I have switched
Read more … Class-d soon in stereo!!
Got the UcD modulator daughter board assembled. It’s the UcD on the right with the DIP comparator. It works quite well and played the first time, something I have found with UcD all the times I have tried this kind of modulator .. it’s just so easy to get to oscillate.
With the chosen components it
Read more … UcD Modulator
New vs. old PCB
Been too long since I posted anything here. Have been bussy …. but not with DIY
Anyway a bit of DIY have been done
I made a new and improved PCB for the SODA modulator. Now both the opamp and the compaator is SMD, as I’ve settled for MAX913.
Read more … New Modulator PCB
Class-d amp running
The design is a self oscillating amp (SODA … read more here, use Google to reanslate from German), and it simply didn’t want to start oscillating.
Just running the modulator without inclusion of the MosFet output stage, it worked like a charm, but including the output stage just didn’t work.
Read more … Class-d …. it’s alive
As you have probably seen on my web site, I have been working on class-d amplifiers for some time.
I have succesfully made a 400W full bridge for a subwofer, and a small mini amp based on the UcD design presented by Bruno Putzeys.
I have also for some time been working on a half
Read more … Class-d Motherboard and modulators
The new series of FETs from International Rectifier called DirectFet, are not really DIY friendly
Look at the comparison between a normal TO-220 stle of MosFet, here IRF640 that I have used in my 400W amp. Besides is the tiny IRF6785 DirectFET which should we good for the same kind of amp size!!!
Read more … Using DirectFET from IRF for DIY amplifiers