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

[janusz]

Hey guys,
I needed some help with the build I’m almost done it.
Where must these go I’m very confused. I got the entire component kit.
The build guide says,
Q1&2 - bc559 , (is BC-327 alternative)
Q3,4,12,14 - bc549 (available)(is bc-337 alternative )
Q5&6 - KSA992 (available)
Please refer to the image below (components for pair of boards)

You can use these replacement transistors without problems but for Q1-2 these are not the best choice. I have some spare bc559 from Jaycar in Perth and I can post these to you in an envelope as a letter. If it's OK for you send me a message with your address.
cheers,

 

[dkamit]

I’ve ordered a few bc559’s from mouser thanks @janusz

 

[janusz]

Problem solved then.

 

[dkamit]

Any idea if I could substitute any other resistor in place of 9.1K on R107 for initial testing.

 

[adason]

Just combine closest resistors you got in series. 6k8 + 2k7 for instance.

 

[janusz]

or two 18k in parallel etc

 

[dkamit]

Hey thanks @adason & @janusz. I got a 9.1K for the 107.
And now the guide says between Tp107&108 it must read 750-800 mV mine reads 0 no wonder why.

 

[dkamit]

I have successfully started my testing on the Wolverine , the board turned on perfectly 4 lights on the IPS turned on the series lamp did not glow at all. No shorts . I measured voltage across TP107 & TP108 it reads 0mV not sure why cause all the other test point readings are perfect. I also tried adjusting the 500R trimpot (R109) but no hope and no change. Let me know what to look for @stuartmp @fireanimal

 

[fireanimal]

@dkamit

Please post detailed pictures of the top and bottom of the board so we can have a look please. Are the LED's on the Output board on ?

 

[dkamit]

New update!!
Got few 0.5A fuses today I used 0.75A initially, now the -V rails fuse blew imminently the +V rail fuse remains intact. Not sure what to look for at this point. Please guide. I have attached detailed images of the board below

 

[fireanimal]

i cant tell 100% for sure, but it looks like the predrivers are installed backwards, and why cant I see the drivers through the OPS holes ? Bottom pics would be helpful

 

[dkamit]

Have a look at these images I haven’t bent them yet as I haven’t ordered the heatsinks for them.

 

[fireanimal]

Predrivers and drivers are installed backwards

Q103 installed backwards

 

[fireanimal]

You better verify all transistors I am seeing more installed wrong. Verify all pinouts with the datasheets, those transistors will also need to be tested

 

[dkamit]

Q103 (BD139) pin3 is base its installed right

 

[dkamit]

I had installed Q106 wrong it has been corrected , I have checked all transistor, diodes and caps it’s perfect.

 

[fireanimal]

Sorry it was the picture that was throwing off my orientation of the drivers. So now do you have bias ?

 

[dkamit]

Blew both fuses this time 🥲🥲

 

[Mainframe]

more pics of corrected transistors? I'm seeing around the wrong way also.

In this picture, both Q105 and Q106 are around the wrong way, you mentioned you only corrected Q106

 

[fireanimal]

yeah more then just Q106 from what I can tell. A close up please of all transistors would be great, front and back