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

[stuartmp]

Hi Everyone,

I have a new video up on the completion of the main board:

Enjoy!

-Dan

Thanks Daniel, I know how much time and effort has gone into producing these videos.

I hope that your videos are watch by all who build this amplifier as they are a valuable addition to the build guide.

If you guy's enjoy Daniel's videos please take the time to leave a comment. I'm sure that he'll appreciate your feedback.

 

[aUDIOhl]

can someone mention the resistor and capacitor reference locations that fall within the signal path. And toshiba, sanken and onsemi output transistors sounds different in the board?

 

[greglo3a]

Some testing info on Matcher; start at post 203:

https://www.diyaudio.com/community/...uring-the-results.307138/page-11#post-6209909

 

[greglo3a]

Per Anatech, with regard to Matcher schematic,

Caps in parallel to collecter/base resistors are not required

C7 thru C10 and C3 thru C6

 

[dazcwl]

Does anyone know if I wound the output coils backwards here? urgh fail.

 

[RickRay]

Doesn't matter as long as it fits nicely, which yours do. I wound both directions, actually wrong way first. They did not sit on the board well at all. When I wound clockwise they sat on the board very well.

 

[jjs]

Does anyone know if I wound the output coils backwards here? urgh fail.

It looks like it but it will still work just the same.

Jeremy

 

[fireanimal]

Spent today making all the heatsinks and winding coils. I remade the CCS/VAS heatsinks because I wasn't happy with the 1st ones. On a side note the pins for the driver heatsink are a tight fit, I had to use my drill press as a press to push them in, but that's a good thing as they will have excellent contact in the heatsink!

 

[ghitus]

Per Anatech, with regard to Matcher schematic,

Caps in parallel to collecter/base resistors are not required

C7 thru C10 and C3 thru C6

Hi Greg, please what do you mean C7 thru C10 and C3 thru C6? Could I get rid of these caps?

Thanks,
Gaetano.

 

[Bodyslam]

I have been trying to find a way to reliably isolate metal screws and spacers from pcb tracks on both the input and main pcb's. Ended up using those TO126 plastic mounting washers and slightly adjusting my spacer length. I have a collection of those washers so not sure where to buy. Perhaps this will help if you are stuck.

These are shoulder washers, also known as step washers. McMaster-Carr has a very good selection of them.

 

[stuartmp]

Does anyone know if I wound the output coils backwards here? urgh fail.

Clockwise is correct as noted in the Bom

 

[Theodosis O.]

Maybe a close photo of the coil would help.

 

[Johno]

Does anyone know if I wound the output coils backwards here? urgh fail.

I am left handed and anti-clock is the only way I can wind the damn things tightly, but as @jjs notes, the inductance does not care.

 

[fireanimal]

Maybe a close photo of the coil would help.

 

[stuartmp]

The reason I say clockwise is because the holes in the pcb are offset from the centreline of the inductor. Winding the inductor coil clockwise will enable it to fit easier.

The other holes in the PCB on the centreline of the inductor are if people want to run their zobel resistor through the centre of the inductor above or below the PCB.

I am left handed and anti-clock is the only way I can wind the damn things tightly, but as @jjs notes, the inductance does not care

 

[danieljw]

Here is a couple of photos of mine if it helps

 

[Garethllywelyn]

Here is a couple of photos of mine if it helps

Here is mine I just started, letting glue set before I make them the correct size tonight.
Clockwise wound

 

[Garethllywelyn]

Installation of my output coil,
1.3mm wire.
Used mobile phone style clear glue for the inside to hold it together.
PCB standoffs and nuts etc are temporary until proper bolts and bits arrive.
Waiting on some transistors before I finish the board.
My 14 turn coil turned out well I think

 

[greglo3a]

Hi Greg, please what do you mean C7 thru C10 and C3 thru C6? Could I get rid of these caps?

Thanks,
Gaetano.

Yes that is correct

 

[greglo3a]

Anyone custom making the heatsinks? I don't have the proper tools other than a drill press. I think you would have some interested individuals in purchasing
them outright. Just a suggestion.