SHO Schematic differences Diode question

Started by Luke51411, March 14, 2014, 08:57:50 AM

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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 :icon_mrgreen:


IvIark

#1
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.
"The future is here, it's just not evenly distributed yet." -- William Gibson

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

#4
The schematic on your 1st post is correct!
"The future is here, it's just not evenly distributed yet." -- William Gibson

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

Quote from: Luke51411 on March 14, 2014, 09:25:55 AM
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

Quote from: IvIark on March 14, 2014, 09:51:36 AM
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.
"The future is here, it's just not evenly distributed yet." -- William Gibson

Luke51411

Thanks for the help and the links! I'm learning from each build. Hopefully I can graduate from newb status before too long :icon_mrgreen:
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  8)

IvIark

Quote from: tca on March 14, 2014, 10:13:44 AM
Quote from: IvIark on March 14, 2014, 09:51:36 AM
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

"The future is here, it's just not evenly distributed yet." -- William Gibson

nocentelli

Quote from: Luke51411 on March 14, 2014, 10:16:40 AM
it's cool that zvex provides schematics for his effects.

How things change.
Quote from: kayceesqueeze on the back and never open it up again

electrosonic

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