Class T-amps

[Reid Malenfant]

Cheers Mark I look forward to hearing how they perform I finally might of found a DIY project to try fot myself

You need to be able to solder John as it's a kit after all, not sure if the control IC is pre soldered onto the PCB but in all honesty i'd seriously not recommend attempting to solder surface mount stuff unless you know what you are doing & have a steady hand & can work quickly

Done it myself previously so i'm not too worried about the prospect. I'll let you know how it arrives

[John]

well that would rule me out lol

[Reid Malenfant]

I'll let you know if they are any good John, you could always get someone else to solder the thing together for you for a nominal sum i feel sure

Meanwhile the waiting game begins

[Welder]

Were you planning on full bridge with these Mark?

[Jonboy]

Meanwhile the waiting game begins

my dac kit arrived very quickly, no slow boat from China for me

[Welder]

John, no not that John, the other one….
Tbh mate I think you’re doing yourself a disservice.
You could pick up adequate soldering skills for this with a bit of practice and I do mean a bit as long as you’ve got a steady hand. It’s not a complex board. The thing that you need to be careful about is not to overheat.

[Reid Malenfant]

No, not full bridge, well not to listen to a stereo pair I'm aware of rail pumping due to the output inductor which is a non issue in bridge mode, but i just want to see how they sound. Frankly none of the smaller class T stuff took my fancy as i like to be able to get to fairly realistic levels & 20W or even 40W won't cut the mustard with most speakers.

I might eventually replace the so damn inefficient amplifiers in the P600 regenerator with something similar to these, in fact they might well do the job admirably once modified

[MartinT]

I might eventually replace the so damn inefficient amplifiers in the P600 regenerator with something similar to these

Ooh, Class T mains regeneration, now that would be a fine thing

[Reid Malenfant]

Ooh, Class T mains regeneration, now that would be a fine thing

Actually Martin i have the perfect & i mean absolutely perfect IC to do that trick & a good few of them to boot

No messing about with level shifting, just straight pulse transformers can be used due to the fixed PWM of 180 degrees, these things shift the phase of the two 180 degree switching mosfets in the bridge to develop the voltage. Normally these would be used in an SMPS with DC output, however if the error amplifier input is fed AC rather than the 2.5V DC from the voltage reference it'll generate an AC output

I have had this in mind for a while tbh, the efficiency of this P600 is pushing me in that direction..

Oh, by the way, note that the IC uses zero voltage switching - it uses stray inductance to make a resonant tank, just like the filter inductors that would be needed to smooth the waveform

No idea how many of these SG3876 ICs i happen to have, must be more than 10. The SG3876 is the equivalent of the UC1876 you can study here

[John]

John, no not that John, the other one….
.

I wait to see how Mark gets on with it I remember soldering when I was about 16 but that was many years ago