Build This MoFo!

[Michael Rothacher]

Pre-BAF appetizer project posted. Enjoy 🙂

Build This MoFo!

EDIT: (6L6, Jan ‘23) above link is dead, here is link to the article - https://6moons.com/audioreviews2/mofo/mofo.pdf

Hope to see you at BAF! Don't forget admission is free for everyone who brings a project.

Let us know what you're bringing in in this thread:

What are you bringing to Burning Amp 2017?

IMPORTANT NOTE: A Zener diode from the MOSFET Gate to Source is needed to protect the MOSFET from inductor "kickback" I got away without this when using MOSFETs with high maximum VGS and lower supply voltages, but had not anticipate the range of FETs, inductors, and supply voltage that might be used. Even when the stars align, it's too close to not consider the Zener mandatory.

There's already a place for this diode on the PCB sold here in the store. When my stars align, I'll update the article pdf.

In the meantime, my good mentor PRR has provided some illustrative filler:
https://www.diyaudio.com/forums/pass-labs/313649-build-mofo-279.html#post6368030

 

[Michael Rothacher]

Some pics 🙂

 

[Zen Mod]

great wrriting , as usual , Mr. Nice Guy 🙂

you got me there , 'till the page 6 ...... I was bitching how I don't have (anywhere near ... or nowhere) bowling/electronic surplus 24/7 place .........

so , Kudos , that's what I can call - Twisted Mind

🙂

 

[vdi_nenna]

Wow! Nice! Always wanted to hear one of those amps (don't want to spoil the read 😉 ).

Thanks!

Vince

 

[Dennis Hui]

Wow! Great stuff Mike.

You bring the whole setup to BA2017?

Dennis

 

[Dennis Hui]

No exotic parts...Dude...this amp demands to be built!

 

[PSz.]

An amp like that could really tie a system together.

Thanks Mike!

 

[tubesguy]

Any thoughts on suitable preamps? This looks like a very nice project, especially for first time builders.

 

[dimkasta]

Lovely 🙂
No excuses

 

[PH104]

Michael - Where did you get the heat sink extrusions? They're pretty cute. Thanks
Phil

 

[Soundhappy]

Thank You so much, Mr Rothacher
20 pages of thrill pleasure humoristic, instructive and Superman DIY.
Incredible ready have 98 % of all Components for MOFO piled on the shelf.
A perfect candidate for my Family members anniversary gift. Kindest regards

 

[Nelson Pass]

Perfection as always, MR.

 

[Gyuri]

At a first glance, if somebody asks me, Nobel Prize in Literature will be yours at this year.
Despite lack of my English.

Or maybe that's why? 😉

 

[Nelson Pass]

I was bitching how I don't have (anywhere near ... or nowhere) bowling/electronic surplus 24/7 place .........

That's why ZM sends his nephew to pick up the "take out"

 

[JPeitzman]

Fantastic!

Michael - Where did you get the heat sink extrusions? They're pretty cute. Thanks
Phil

I'm not MR (obviously 😛) but they look like Aavid DB120's or similar. They're for power modules, large relays, stuff like that.
edit: You can find them for instance at Newark DB120-20 - AAVID THERMALLOY - Heat Sink, Square, For 80MM Power modules and Solid State Relays, 0.41 degC/W, 135 mm, 125 mm, 120 mm | Newark element14

 

[Zen Mod]

That's why ZM sends his nephew to pick up the "take out"

yeah ...... remember .... I was always rooting to just let me near Papa's Ark

(I believe you have (across The Pond) same joke- Scientist , Philosopher and Engineer ; problem with extremelly big room , naked beauty in centre of the room , and how to reach it , in every step taking exactly half of distance .... ? )

 

[silasmellor]

Am I the only one wondering about the unpopulated zener diode?

 

[vdi_nenna]

Am I the only one wondering about the unpopulated zener diode?

Mosfets gate protection?

 

[Soundhappy]

MOFO sing with charming voice

Is now few hours I play music through MOFO amp with a high gain triode preamp and class A audio source. IRFP240 is the horse not IRFP250.My first impressions are Easy, Quick and Fun point to point build with what I have found in a drawer today. PSU = 24 Volt bias = 2,5 A is big 193V Hammond version. Amplifier with his own character
Thanks Michael is BAF projects who make me happy

 

[eLarson]

I enjoyed the article very much. In style it reminded me of Corey Grreenberg's Aunt Corey's Passive Buffered Preamp series from Stereophile.

A question about the laptop charger: does anyone sell those replacement jacks?