Zvex - Mastotron [guts, schematic, PCB layout]

~arph · Post by **~arph** » 29 Aug 2009, 13:07

Guts:

download/file.php?id=4399&mode=view
download/file.php?id=4398&mode=view

C5 and C6 unknown, probably in the range of .1uf to .47uf
Schematic:

Mich P · Post by **Mich P** » 29 Aug 2009, 14:11

Well done ~Arph !!
Mich P.

deathofaparty · Post by **deathofaparty** » 29 Aug 2009, 16:37

Awesome! So how does this compare to the Woolly Mammoth?

soggybag · Post by **soggybag** » 29 Aug 2009, 16:57

The big difference between this and WM is the pot on the input and the switchable output cap?

soulsonic · Post by **soulsonic** » 30 Aug 2009, 05:46

Cool! Good work!

I've been considering purchasing one of these... does it sound good? I'd probably swap out some of the parts if I got one because I'm a mojo snob.

UZILSD · Post by **UZILSD** » 30 Aug 2009, 10:10

Many many many thanks!!!

~arph · Post by **~arph** » 30 Aug 2009, 10:46

The WM sounds loads better. I think this pedal sounds really bad, I don't see why it should be an interesting pedal too have. The most important thing is the fuzz sound and that could have benefitted from a little more tweaking. (axis face would be a good start)

Mr. SD-1 · Post by **Mr. SD-1** » 30 Aug 2009, 20:46

How do the pots in the schematic relate to the knob labels? I think...

Pot 1 = Relax/Push
Pot 2 = Pulse Width
Pot 3 = Fuzz
Pot 4 = Volume
Pot 5 = Tone

Is this correct?

~arph · Post by **~arph** » 31 Aug 2009, 07:08

Yes, I forgot to put the labels on. You are correct.

gkoerselman · Post by **gkoerselman** » 03 Sep 2009, 12:34

Any more information on the caps for the 'Subs' switch?

I read that; "position 3 is huge, 2 is medium and 1 has no bass left".

Thanks for the schematic ~arph!

~arph · Post by **~arph** » 03 Sep 2009, 17:53

Nope, I have no means of accurately measuring them.. neither have I breadboarded this.

I'd say one of the caps is around 10nF and the other say: .47uF

It's a high pass filter with the 10k pot to gound. So you can calculate some cutoff frequencies. the 100uF gives you a cutoff of 0.2 Hz so that is the Huge setting. The rest is a matter of taste.

gkoerselman · Post by **gkoerselman** » 07 Sep 2009, 13:57

Here is my PCB layout (300dpi).

Not verified yet, so let me know of errors or recommendations...

~arph · Post by **~arph** » 07 Sep 2009, 14:19

Nice, pretty tight!!

Anyone interested in a mastotron? PM me, I have one available @125 euros

trad3mark · Post by **trad3mark** » 07 Sep 2009, 18:23

Excellent work all! This is definitely going on the to-do list.

Those mystery caps, any chance of some good photos of them??

~arph · Post by **~arph** » 08 Sep 2009, 07:54

I can do good photo's, but they are unmarked smd caps, I would not know how you can tell their value apart from measuring them.

iloop · Post by **iloop** » 09 Sep 2009, 13:30

who can make a original PCB layout

~arph · Post by **~arph** » 09 Sep 2009, 15:11

What do you mean? you wish to have the original layout? why?

iloop · Post by **iloop** » 10 Sep 2009, 16:06

it look's cool

chicago_mike · Post by **chicago_mike** » 10 Sep 2009, 16:32

And all this time I thought nobody liked zvex..

Jaicen · Post by **Jaicen** » 11 Sep 2009, 12:32

FWIW, I believe that the original PCB layout can be considered copyright as 'artwork.'

Zvex - Mastotron [guts, schematic, PCB layout] [traced]