SHO Schematic differences Diode question

[Luke51411]

I built a SHO based on this schematic and I like it. However, I've seen other schematics with a different diode configuration. One diode goes to power and one goes to ground both coming from the Gate instead a single zener going from the source to the gate. I'm just wondering how these changes effect the circuit. I know enough about electronics to be dangerous but not enough to quite understand what's going on

[IvIark]

They're just used as electrostatic protection for the mosfet, although with the latest one the diode actually goes from gate to ground, not source.

[tca]

^ No. The Zener is from gate to source, the schem is correct.

[Luke51411]

So the version with the gate to ground and gate to power diode is just providing extra protection for the mosfet compared to the schematic I posted?

[tca]

The schematic on your 1st post is correct!

[IvIark]

It works, that doesn't mean it's correct.  I think Zack's own schematic can be fairly well trusted:

http://www.zvex.com/module_instructions.pdf

[IvIark]

So the version with the gate to ground and gate to power diode is just providing extra protection for the mosfet compared to the schematic I posted?

Both ways protect the mosfet, Zack may have ended up with the final version simply because it uses one less component, he'd need to answer that one.

[tca]

It works, that doesn't mean it's correct. 

One should always look at any schematic with a grain of salt

Page 14: http://www.fairchildsemi.com/an/AN/AN-558.pdf

Here is some more info: http://www.diystompboxes.com/smfforum/index.php?topic=17767.0

Cheers.

[Luke51411]

Thanks for the help and the links! I'm learning from each build. Hopefully I can graduate from newb status before too long
I'm putting my SHO build into a 1590a so maybe that will up my xp it's cool that zvex provides schematics for his effects. Crazy that people will pay what they do for these effects. I guess ignorance is bliss  

[IvIark]

It works, that doesn't mean it's correct.

One should always look at any schematic with a grain of salt

Page 14: http://www.fairchildsemi.com/an/AN/AN-558.pdf

Here is some more info: http://www.diystompboxes.com/smfforum/index.php?topic=17767.0

Read what I wrote, I didn't say it doesn't protect the mosfet quite the opposite I said it works (an in the AMZ mosfet booster), but what I then said is it's not how the manufacturer has told us that he protects the mosfet in a Super Hard On.  I often do take manufacturers with a pinch of salt but when it's something as innocuous as mosfet protection and on an official product I can't see too many reasons for him to lie.

[tca]

I'm learning from each build.

We all do.

Cheers.

[nocentelli]

it's cool that zvex provides schematics for his effects.

How things change.

[electrosonic]

http://www.zvex.com/module_instructions.pdf

The inventobox? That thing still around?