Class-d amp running at +-45V

Tried to run the prototype on +-45V. Works fine but, I need to add more dead time. It runs so hot without a heatsink that the PCB warms upp and thereby warms up the thermistor used in the over heat security circuit, and this is when it is just mounted on the PCB and

Read more … Class-d amp running at +-45V

Class-D Amp version 3 running

Well it’s been some time since I started working on my third version of my class-d design. It has taken some time to make work reliably.

I had designed without any means of additional dead time than is provided by the gate diodes and resistors. This is simply not a way to go. The output simply

Read more … Class-D Amp version 3 running

Class-D, New revision, New PCBs

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

ScanSpeak 13M/8636 Burned

Testing my Class-d amp …. which now sounds really, really good ….. was on the other hand too much for one of my mid drivers …

The problem is that it just sounds so clear, that it dosent sound as loud compared to when the sound is distorted …..

Damn … ScanSpeak 13M Kevlar gone

Read more … ScanSpeak 13M/8636 Burned

Class-d Amp listening impressions

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

Read more … Class-d Amp listening impressions

Class-d soon in stereo!!

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

Read more … Class-d soon in stereo!!

UcD Modulator

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

Read more … UcD Modulator

New Modulator PCB

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. Though

Read more … New Modulator PCB

Class-d …. it’s alive

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

Read more … Class-d …. it’s alive

Class-d Motherboard and modulators

Class-d Motherboard

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

Read more … Class-d Motherboard and modulators