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

[fvzeppelin]

1st Chassis is now complete! I am testing the amp on my JBL Studio 590's and WOW does it sound awesome! The SMPS from Microaudio is top notch, comparing it to linear supplies I have built in the past, you would not know the difference, minus the weight and extra wiring. I do have a bit higher noise floor on the left hand board, but I am going to try some aluminum or copper plate to create a shield between the SMPS input and the left channel. I measured the left channel at -91 dbV A-weighted and the right channel at -94 dbV A-weighted, but its below what I can hear through my speakers.

Not sure how that compares with other builds, my wiring could also use a tweak, but I want to run this amp in over the next few days, then remeasure the voltages to see how stable it stays.

The final home for 2 of the amps / 4 channels is going to be for my JBL Project Array 1400's that are being actively crossed over with a Minidsp flex. After listening to this amp on my baby JBL's, I cannot wait to get another amp chassis complete!!

Thanks again to the TEAM for all the work on this amazing amp!

Is there an integrated relay on the PSU which can be controlled by this 12V switch?

 

[voxxonline]

I think it is time to read "how to wire" pdf 🙂

 

[stuartmp]

Hi Guy's

Just a quick update.

The PCB's fabrication is now complete. They should ship from china in a day or so.
Once they are received we will quality check them and sort them.
We will then pack them up and send out shipping payment requests.

The orders will be processed in the order they were received so please be patient.

 

[stuartmp]

Hi Guys,

I also just wanted to mention that we have a few extra boards left over from the group buy.
So if you would like to order some please follow the procedure outlined in the first post of the second group buy.
The Wolverine 2nd Group buy.

Please don't email me and ask if they are available. Please assume they are.
We will let you know once there is no boards left.

This will save me time answering emails.

 

[fabi_l]

I have had a few people ask me the difference between RAW and Finished heatsinks, so I just want to clarify.

RAW - As Cut. Needs cleaned up, holes deburred, holes tapped, pin holes drilled and pins installed.
View attachment 1103908

Finished - Plug and Play 😀
View attachment 1103909

Also I have shipped enough of these now, shipping is usually $10 USD anywhere in the world I have shipped to.

Hey fireanimal,
do you still have heatsinks left?
Maybe you could write me a PM (as I am not able to do it myself)
Thanks a lot
Fabian

 

[lotharx]

Full length (75mm) EF3-4 heatsinks now available.

Hi Fireanimal-

Do you still have finished EF3-3 and EPS heatsinks available? If so, could you let me know how to obtain a pair of sets??
Thanks.

lotharx

 

[fabi_l]

Are there any reasons on how to choose the input impedance (10k vs 22k)?
I did not find any explanation in the BOM or build guide.

Thanks a lot
Fabian

 

[fireanimal]

Depends on your source. 10k will be lower noise. Most modern sources have no issues driving 10k input. Look up your sources output impedance to be sure.

Are there any reasons on how to choose the input impedance (10k vs 22k)?
I did not find any explanation in the BOM or build guide.

Thanks a lot
Fabian

 

[voxxonline]

I will be ordering psu and soft start pcb's for the first time from pcbway- do I really need ENIG finish and double thickness traces or a standard pcb option should suffice ?

 

[RickRay]

I will be ordering psu and soft start pcb's for the first time from pcbway- do I really need ENIG finish and double thickness traces or a standard pcb option should suffice ?

My opinion, for those two boards, I would order double thickness and ENIG, especially for this amplifier that will require many amps to reach it's full potential.

 

[voxxonline]

Noted. Thank you

 

[stuartmp]

Hi Guy's,

The boards have arrived.
Jeremy and I will now begin to sort and pack our orders ready for shipping. We will send out shipping payment requests once we have the orders ready to go.

 

[JHUSTON]

Tonights progress......
matched TO92 parts coupled with a tiny smear of heatsink paste and joined with heatshrink and installed....
View attachment 1051777

What method or device did you use to match those ltp

 

[jdoorn]

What is better? I use super glue to bond the TO92 devices together, after that I also use heatshrink for extra strenght and isolation.

 

[danieljw]

What method or device did you use to match those ltp

They are matched with a custom made curve tracer device. A component tester gets you close first and then you can measure parameters at the operating point to get a very close match.

- Daniel

 

[danieljw]

What is better? I use super glue to bond the TO92 devices together, after that I also use heatshrink for extra strenght and isolation.

Super glue alone works well also.

 

[julienfesty]

What's the EF3-4 size ?

 

[ItsAllInMyHead]

^ Physical size of the boards? 347mm x 77mm

 

[jeparamedia]

that great all 👍🏻

 

[julienfesty]

^ Physical size of the boards? 347mm x 77mm

Thanks a lot !