SHO clone questions

[pufferton]

I want to build a SHO (my first real build) using this vero layout
http://tagboardeffects.blogspot.com/search/label/ZVex?m=0

Here are my questions:
1)I'm assuming Gain 3 goes to the Boost pot but where do Gain 1 & 2 go?
2) Or does gain 1-3 coincide with the Boost Pot lugs?
3) I want it to have the second output (for tuner) is it better to split off with two wires from the board to each jack OR run a single line to OUT1 and jump it over to OUT2?
4) in your experience do you think i could fit 2 outputs in a 1590A or would i need to bump it up to a 1590B or larger?
for reference i want 1 IN, 2 OUT, 1 clear shaft illuminated POT, 1 switch, and DC jack.

You guys are awesome and thanks for being a helpful pool of juicy knowledge!

[pufferton]

Or is this a better build to use?
www.aronnelson.com/gallery/main.php/v/Renegadrian/ZVEX+SHO+zener.gif.html

[aron]

Look at the 2nd post. The 2 lugs are connected. That's why the first post has 1&2 coming off that trace - they are both connected.
Rename Gain with Crackle and it starts making sense. If you are starting out, go with the larger enclosure.

[pufferton]

Look at the 2nd post. The 2 lugs are connected. That's why the first post has 1&2 coming off that trace - they are both connected.
Rename Gain with Crackle and it starts making sense.

That's what I was starting to put together but wanted to make sure. Thanks!

[pufferton]

Any thoughts on the two output wiring?

[slacker]

It shouldn't make any difference if you run separate wires to the two jacks or jumper them. The end result is the same.

[pufferton]

Great! That's all I needed to know. I'm now gonna order parts.

Real quick: do you foresee an issue with wiring up a 3 way DPDT toggle to change input caps from 47n-ish(less bass) to 100n (stock) to 220n (more bass) similar to the Mastotron? It's so I can play it with both bass, electric, and acoustic.

AND I want to use the Alpha Clear Shaft Pot but it doesn't come in 5K Rev Log. Could I just get a 10k log and wire it in reverse?

[petemoore]

  10k pot covers 5k - 0.0k range.
  10k pot covers 10k - 0.0 range too.
  The first 5k range will be over a small portion of knob rotation, settings will be 'touchy', fine tuning will be difficult.
  because 10k parallel 10k = 5k
  You have 10k worth of 'play room' with which you can reduce the pot total value with.
  Simple as a 10k resistor across the outside lugs of the 10k pot.
  Or...spread across the two pot resistances [lug<to wiper / wiper to >lug] because the pot is a variable resistive divider = 2 resistances that add to = the pot R value, one 'side' gets bigger when the other side gets smaller value.
  So resistors can be placed on either side of the wiper lug, to outside lugs of the pot, the pot + any tapering resistors can then be measured to see if you've built to about  5k total across the outside lugs.
  This spreads the 5K Range across the pot rotation, the taper can be altered by altering the tapering resistor values to make the knobs control more evenly spread across it's rotation.

[petemoore]

  Probably would start with a linear 10k pot, then add 10k worth of resistor across to make it = 5k total.
  Mess with the tapering values or study and chart the resulting R sweeps..etc. maybe there's online calc for such ?
  I can't know, guess a 10k audio taper pot would not get an even spread of control across it's shaft rotation even with tapering resistors.

[pufferton]

 10k pot covers 5k - 0.0k range.
 10k pot covers 10k - 0.0 range too.
 The first 5k range will be over a small portion of knob rotation, settings will be 'touchy', fine tuning will be difficult.
 because 10k parallel 10k = 5k
 You have 10k worth of 'play room' with which you can reduce the pot total value with.
 Simple as a 10k resistor across the outside lugs of the 10k pot.
 Or...spread across the two pot resistances [lug<to wiper / wiper to >lug] because the pot is a variable resistive divider = 2 resistances that add to = the pot R value, one 'side' gets bigger when the other side gets smaller value.
 So resistors can be placed on either side of the wiper lug, to outside lugs of the pot, the pot + any tapering resistors can then be measured to see if you've built to about  5k total across the outside lugs.
 This spreads the 5K Range across the pot rotation, the taper can be altered by altering the tapering resistor values to make the knobs control more evenly spread across it's rotation.

Hmmmm ok I read on the tagboardeffects thread that someone did what I said and they got larger amounts of clean headroom before gain kicked in because of the way the SHO works....

The only reason I ask is cause I wanted to use the Alpha Clear Shaft pot but they don't make them in 5k rev log...or even just 5k

Meaning it may not be worth all of that just to have a cool light up pot

[pufferton]

  10k pot covers 5k - 0.0k range.
  10k pot covers 10k - 0.0 range too.
  The first 5k range will be over a small portion of knob rotation, settings will be 'touchy', fine tuning will be difficult.
  because 10k parallel 10k = 5k
  You have 10k worth of 'play room' with which you can reduce the pot total value with.
  Simple as a 10k resistor across the outside lugs of the 10k pot.
  Or...spread across the two pot resistances [lug<to wiper / wiper to >lug] because the pot is a variable resistive divider = 2 resistances that add to = the pot R value, one 'side' gets bigger when the other side gets smaller value.
  So resistors can be placed on either side of the wiper lug, to outside lugs of the pot, the pot + any tapering resistors can then be measured to see if you've built to about  5k total across the outside lugs.
  This spreads the 5K Range across the pot rotation, the taper can be altered by altering the tapering resistor values to make the knobs control more evenly spread across it's rotation.

yea...some of what you said has gone over my head...some of it is a bit hard to understand...

[Eric.nail]

I'v used a few different variations over the last year or two building these for buddies. I stick with the 5K rev log. Linear taper worked fine too. the 10K was ridiculously loud before it breaks up. Which really defeats the purpose of the SHO rather than like...A Keeley Katana. Where the circuit was designed to be extremely clean before it breaks. The control on a Rev log 5K pot was just fine. If you're that worried about it...You need to drink a beer.

As for fitting in a 1590A, Forget the second output. There's hardly enough room in their for the existing jacks to begin with. Though with the small enclosure it does look rather sexy!
http://img20.imageshack.us/img20/48/photofe.jpg