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

[Nikos]

Hello my friends . I'm in the final stage of assembly...and I need to choose capacitors can i have your opinions

 

[fireanimal]

Hello my friends . I'm in the final stage of assembly...and I need to choose capacitors can i have your opinions

My vote would be for the United Chemi-Con KMH

 

[Harry3]

The BOM has been updated. For reference see post 2057.

Thanks to miran50 and mhuth1776 for bringing it to the teams attention.

Huge thanks to Andy who ripped his amp apart at least 20 times to do the testing.

 

[Nikos]

I have these transistors , its good for the replacement of 340G?

 

[fireanimal]

I have these transistors , its good for the replacement of 340G?

Yes those are the correct transistors.

To clarify, the only difference between S and STU is the Packing, Bulk or Rail. Any of the above highlighted are correct for Q103 and Q104

 

[Chrisr3521]

Going through parts lists, resistors R120AB to R125AB the part numbers listed, any performance difference with the amplifier between these, 279-RR03JR43TB ( which are 430mOhms) and 71-CPF3.475%T00?

 

[Nikos]

Little progress

 

[69383]

@ Nikos Like your hard wiring, a bit of hard wiring between start and finish saves us from boredom. Here is mine.

 

[wkloppen]

Powersupply setup getting a bit closer to target. Any constructive comments for a noob amp builder appreciated.....

 

[danieljw]

Looking good so far, i would suggest to use X2 rated (mains rated) caps for the loop breaker section instead of the small monolithic caps.

You might need heatsinks for your psu inline bridge rectifiers alternatively chassis mount them.

I am in the middle of a new video which will go over wiring and layout etc.

Here is a teaser video:

 

[RickRay]

Pretty sure those are the bridge rectifiers, not ground loop breakers.

 

[RickRay]

But they have the resistor across them, I'm not sure here.

 

[Vunce]

Bridge rectifiers are mounted on the psu boards. But they probably will need some heatsinking.

 

[wkloppen]

But they have the resistor across them, I'm not sure here.

Groundloop breakers as per powersupply example in the wolverine docs.

 

[RickRay]

Bridge rectifiers are mounted on the psu boards. But they probably will need some heatsinking.

I'm seeing them now. You may be able to mount them from underneath and attach to the chassis. Makes for a pretty clean installation.

 

[poseidonsvoice]

@wkloppen

If interested, stuart has graciously shared his Ground Lift PCB. Link to order through PCBWAY is here.

I used it to great effect on a recent build:

Best,
Anand.

 

[wkloppen]

Ground Lift PCB. Link to order through PCBWAY is here

Yeah,...I saw the board on PCBway. I now see my 10R 5W resistor is kinda biggish🙂...but doesn't matter.

Bridge rectifiers are mounted on the psu boards. But they probably will need some heatsinking.

Need to custom fabricate them from one 2mm alu plate for the 4 of them I guess, cutting them up nicely to increase the surface. Not much room on the metal side.

 

[danieljw]

@wkloppen

I purchased a couple more inline bridges to test chassis mounted. During sine testing these get quite warm with the smallish heatsinks I made.

 

[NSP]

Are any components included in the ground lift pcb from pcbway? I just noticed that the price for 5 pcs of the ground lift pcb is $37 and the price for 5 pcs of the T-ground pcb is only $6,50. 🤔

 

[kokkie]

I received the BD13916STU this morning from RS (761-3511) and they have the correct isolated packaging. Much faster than Mouser for European builders who cannot wait to implement the new bias circuit.