DIY Class A/B Amp The "Wolverine" build thread

[milund]

View attachment 1470048

Quick rough example. Your two channels get connected in series.

Is this also true for for supplies that internally can put the two channels in series - like the SIGLENT Serie SPD3000X-E? It seems the 0v/GND is not available as a midpoint on this supply? (I am looking at buying a lab-supply, and will of course net a +/- supply with 0V midpoint)

 

[adason]

Ok, as big as that 5U chassis from Modushop is, there are only so many ways to orient huge transformers and the Universal Power Supplies from the diyaudio store. I have the two transformers sitting on top of each and would plan some kind plate on standoffs to separate them. The only other thing I can think of is to mount the two transformers vertically on L brackets. That would change the orientation of the EMF generated by them. I have no idea how that would impact performance. Likewise, I am proposing to mount the two Power Supply Boards on top of each other using long M3 standoffs. That would put the rectifiers closest to the front panel and away from the IPS. The rest of it is a SS Board and a Speaker Protector board. The small transformer is needed to power the Speaker Protector circuit, and I would appreciate guidance on where to locate it. At this moment I have only one ground lift board. The other little board is a T ground.

Your guidance is much appreciated. I've built an F4 and an F6, but I never tried to cram this much into one chassis. This is my first dual power supply.

John

I have outboard power supply, with extra caps in the chassis. Just an option. No clutter, no hum.

 

[bullittstang]

Is this also true for for supplies that internally can put the two channels in series - like the SIGLENT Serie SPD3000X-E? It seems the 0v/GND is not available as a midpoint on this supply? (I am looking at buying a lab-supply, and will of course net a +/- supply with 0V midpoint)

Looks like that PSU would be fine. Manual states it can run Independent, Series and Parallel modes. Also gives good illustrations of how to connect. I just googled your model# posted and it was 5-6th down in results.

 

[milund]

@bullittstang does this mean I would simply use independent mode and connect as per the drawing to have a 0V midpoint? The series-mode does not seem to provide that.

 

[bullittstang]

Yes, but check with DMM and no load first to make sure it’s operating as expected before ever connecting any kind of load.

The series and parallel modes generally means the channels are wired independent of each other internally, which is the important part of being able to use as a dual voltage supply. If they are shared internally, you can send voltage out of one channel and back feed into the other, which is bad.

 

[jminassi]

I have outboard power supply, with extra caps in the chassis. Just an option. No clutter, no hum.

Interesting, I'm also building a Pearl 3 phono stage and that is the approach Wayne took when he designed it.....but then two chassis and an umbilical cord.

 

[adason]

Yup. Most of my first watt amps are with external supply. Box for supply is most of the time hidden in the back, so it does not need to be fancy.

 

[jminassi]

Adason, that is a good approach because it avoids a lots of issues and worries about loop area. But I am going to try to make it work in the 5U chassis. If I have issues, I can re-build the power supply into a separate box. Once this thing is built and tested, I am going to have to ask a couple of you guys over to help me move the amp😁.

John

 

[mario78]

Finally started today to build up.......Very nice Boards 😉