Zvex - Box of Metal  [traced]

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Re: Zvex - Box of Metal - gut shots, schematic, PCB layout

Postby DimebuGG » 01 Jan 2011, 14:09

It's okay... :thumbsup
Finch: A witty saying proves nothing - Voltaire
Stifler: Suck my dick - Ron Jeremy
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Re: Zvex - Box of Metal - gut shots, schematic, PCB layout

Postby mysticwhiskey » 01 Jan 2011, 14:14

Cheers - thanks again for the layout, it's great as I was looking for a PCB-mounted 16mm pot layout. 8)
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Re: Zvex - Box of Metal

Postby Wlat » 03 Feb 2011, 12:06

Hi! This is my first post here, so be gentl ;-)

I am intruiged by the noise gate on the Mox of Betal, so I took some effort to draw the schema based on the sketch, the layout/silkscreen overlay and the gutshots. I couldn't find the correct symbol for the VTL, but I think the idea is clear.
I'm confused about the use of both a VTL(5C9) and a FET (J175?). If I read the layout correctly, the VTL seems to be connecting the signal path to the positive supply voltage. The FET is only switched by the footswitch, but connects the gate to the signal path. Looks to me like this can't work...
It would appear more logical to connect the VTL not to the source of the FET but to the gate, controlling the switching function of the FET. Also, connect the footswitch to the drain and source, thus bypassing the FET and ingoring the gate function.

Anyone has any thoughts about this?

greetings,
Wlat
the Netherlands
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Re: Zvex - Box of Metal

Postby Wlat » 05 Feb 2011, 14:54

I just found out that the pinout of the J175 in the silkscreen overlay seems to be incorrect:
J175-pinout.jpg
The gate and drain are swapped, and so all schematics made up from this have this error.
So, when I redraw my schematic of the noise gate with this swap adjusted it gives me the following:
BoM Noise Gate v0.1 error.png


However, this doesn't appear to be right either. The FET gate connected to the Treble pot wiper???
My best guess is the following:
BoM Noise Gate v0.2.png


For good measure I've also drawn the complete schema:
BoM Noise Gate placement v0.1.png


And the footswitches:
BoM Switch.png


I would very much appreciate any comments...

regards,
Wlat
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Re: Zvex - Box of Metal

Postby rasta_maleek » 08 Mar 2011, 09:13

have anyone the layout of this?
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Re: Zvex - Box of Metal

Postby Wlat » 08 Mar 2011, 10:17

I'm working on a layout...
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Re: Zvex - Box of Metal

Postby rasta_maleek » 09 May 2011, 08:52

Wlat wrote:I'm working on a layout...


did you finish tath layout Walt?
thanks for the working progress
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Re: Zvex - Box of Metal

Postby ballfire » 09 May 2011, 09:03

amazing...
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Re: Zvex - Box of Metal

Postby sinner » 09 May 2011, 09:07

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Re: Zvex - Box of Metal

Postby sinner » 09 May 2011, 17:19

askwho69 wrote:does the noise gate works? :D


No idea matey, but it looks like there is no any
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Re: Zvex - Box of Metal

Postby rasta_maleek » 18 Jul 2011, 09:53

any news about the bom with gate?
great proyect!
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Re: Zvex - Box of Metal

Postby rasta_maleek » 14 Dec 2011, 19:28

Up for GAS :applause:


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Re: Zvex - Box of Metal

Postby JebemMajke » 17 Dec 2011, 01:21

So i really need zener or can i replace it with some other diode?
Great work with the schematic.
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Re: Zvex - Box of Metal

Postby rasta_maleek » 17 Dec 2011, 10:14

JebemMajke wrote:So i really need zener or can i replace it with some other diode?
Great work with the schematic.

I think that if you don't use the 9,1v Zener, you must use two 1N4148 like older SHO, Zener is limiting the voltage too.
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Re: Zvex - Box of Metal

Postby JebemMajke » 17 Dec 2011, 10:40

In series? With both 1n4148's negative on where negative part of Zener would go?
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Re: Zvex - Box of Metal

Postby Wlat » 08 Feb 2012, 08:05

Hi!
It's been a while since I started working on the noise gate. Somehow life got in the way...
Anyway, I'm at it again and started to use Eagle now for a pcb. I took Madbean's excellent layout as a basis (hope that's allright?) but I'm still having a bit of trouble getting the noise gate parts neatly without to much "spaghetti".
Here's my layout so far [unverified]:
04 PCB.png


Does anyone have a tip for getting a better layout?

Thanks,
Wlat
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Re: Zvex - Box of Metal

Postby wgtp » 28 Feb 2012, 06:53

Joe Davisson, whose Obsidian mosfet distortions preceded Zvex' designs by several years, has reported that P-channel BS250 mosfets are quieter than the N-channel BS170's, due to construction. You would have to flip the power around, but it might be worth it with all the gain and mosfets. :twisted:
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Re: Zvex - Box of Metal

Postby wgtp » 28 Feb 2012, 06:53

Joe Davisson, whose Obsidian mosfet distortions preceded Zvex' designs by several years, has reported that P-channel BS250 mosfets are quieter than the N-channel BS170's, due to construction. You would have to flip the power around, but it might be worth it with all the gain and mosfets. :twisted:
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Re: Zvex - Box of Metal

Postby served » 31 Mar 2012, 20:50

Hi,

Do you have a schematic with the original Gate control around?

I already built the BOM but now I feel like there is too much noise in this pedal. Is there a way to add a Gate function to the pedal?
How complicated is it? Does any one have a glue how Zvex made it?
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Re: Zvex - Box of Metal

Postby Wlat » 01 Apr 2012, 06:43

served wrote:Hi,

Do you have a schematic with the original Gate control around?

I already built the BOM but now I feel like there is too much noise in this pedal. Is there a way to add a Gate function to the pedal?
How complicated is it? Does any one have a glue how Zvex made it?


View my posts of feb 2011 and feb 2012 (both page 8). Alas, not verified yet. I'm having trouble finding time to complete this project...

Greetings,
Wlat
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