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Thread: building a zvex SHO clone, is there anything I should know about the mosfet?

  1. #1
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    building a zvex SHO clone, is there anything I should know about the mosfet?

    Found a schematic that shows a BS170 transistor. Looking at Newark there are several to choose from. Is there anything I should know before ordering them?

    This is the one I selected just because it was first on the list. I know very little about transistors and zero about mosfets.

    http://www.newark.com/fairchild-semi...-to/dp/58K8772
    ~Semi-No0b Hobbyist~

  2. #2
    Senior Member Enzo's Avatar
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    perhaps you could provie the schematic for your project?
    Education is what you're left with after you have forgotten what you have learned.

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    Something you should know?

    Yes. MosFets are static sensitive, so don't wear phentex slippers and drag your feet across shag rugs. They're reasonably hardy, but the trick in early stages of pedal-building is to provide yourself with assurances that some sources of potential non-functioning can be safelyruled out, such that you can focus your attention on those few things that might still matter.

    So, just to be able to say "It's not that", when the inevitable troubleshooting happens, install a socket and insert the BS170 into the socket once everything is soldered up.

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    Here's the schematic I'm following.

    https://hotbottles.files.wordpress.c...3/zvex_sho.gif

    I'm in Florida and it doesn't usually get dry enough to have problems with static (I think?). I never get a charge from touching objects like I have in other climates, fwiw.
    ~Semi-No0b Hobbyist~

  5. #5
    Supporting Member Steve A.'s Avatar
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    Quote Originally Posted by Enzo View Post
    perhaps you could provide the schematic for your project?
    I have no idea which schematic mort used but the circuit is very simple for a pedal that sells for $150. Here is a very comprehensive link...

    http://revolutiondeux.blogspot.com/2...rd-on-sho.html

    ... and my Evernote re-creation of the page with all of the schematics and embedded links which can be viewed or downloaded:

    https://www.evernote.com/shard/s300/...b1adfb590d727c

    Steve Ahola
    Last edited by Steve A.; 01-01-2017 at 03:10 AM.
    mort likes this.

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