Zvex - Box of Rock  [traced]

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.

Postby Torchy » 23 Jan 2008, 00:06

Ok, my contribution - a bit smaller ... change boost section values and you got a mini sized SHO.

Image
Torchy
 

Postby s.r.v. » 23 Jan 2008, 04:53

is that verified? so far i have built 2 sho's from vero layouts, and neither of them have worked :(
User avatar
s.r.v.
 
Posts: 34
Joined: 12 Jan 2008, 19:17
Has thanked: 0 time
Have thanks: 0 time

Postby alteredsounds » 23 Jan 2008, 12:03

never had a torchy build that didnt work and i've made a fair few of them
User avatar
alteredsounds
Resistor Ronker
 
Posts: 256
Joined: 01 Oct 2007, 13:28
Has thanked: 0 time
Have thanks: 6 times

So many SHOs...

Postby lefty » 23 Jan 2008, 12:57

While I don't doubt the validity of the SHO layout above, I have more than 7 layouts and at least 3 differing schems for the SHO on my computer.
The above is the first one I've seen with only one diode. All other have either had none (japanese site) or two at the input (I believe analoguru may have made the one I'm thinking of). More recent SHOs also have a zener diode; confirmed by Zach in a DIYStomp thread.

I threw together this layout from a schem and can confirm it works well as I have two of it already and they sound pretty good. It could be smaller and I'll probalby do so, but as it is, it's known to work.

h t t p :// notinteractive . com /stuff/guitar/sho-perf.png
lefty
 
Posts: 19
Joined: 15 Jan 2008, 01:38
Has thanked: 0 time
Have thanks: 0 time

Postby briggs » 23 Jan 2008, 13:16

alteredsounds wrote:never had a torchy build that didnt work and i've made a fair few of them


+1. Great to see the great Vero's again torchy :D Respect to the vero!
Image

I am Klon.
User avatar
briggs
Tube Twister
 
Posts: 1997
Joined: 12 Jul 2007, 11:02
Location: Breaking into Heaven.
Has thanked: 30 times
Have thanks: 124 times

Postby alteredsounds » 23 Jan 2008, 14:24

I built the 1st one I saw here, Igloo's I think and it worked fine, what problems are u having?
User avatar
alteredsounds
Resistor Ronker
 
Posts: 256
Joined: 01 Oct 2007, 13:28
Has thanked: 0 time
Have thanks: 6 times

Re: So many SHOs...

Postby Torchy » 23 Jan 2008, 17:02

lefty wrote:While I don't doubt the validity of the SHO layout above, I have more than 7 layouts and at least 3 differing schems for the SHO on my computer.
The above is the first one I've seen with only one diode. All other have either had none (japanese site) or two at the input (I believe analoguru may have made the one I'm thinking of). More recent SHOs also have a zener diode; confirmed by Zach in a DIYStomp thread.


This not the SHO, it is the boost section from the BOR.

I said if you change the values (ie to the SHO schem) you can use it to build a pot-mounted SHO.

The diode clamp is superfluous (the "two at the input"), and you can use either an LED/small-sig diode/zener/whatever across the G-S junction as its only spike protection. I have seen several different version of the genuine (original) SHO with different guts as well.
Torchy
 

Postby lefty » 24 Jan 2008, 00:05

Thanks for clearing that up Torchy, much appreciated :)
lefty
 
Posts: 19
Joined: 15 Jan 2008, 01:38
Has thanked: 0 time
Have thanks: 0 time

Postby s.r.v. » 24 Jan 2008, 00:27

I think i'll try torchy's vero, and the SHO perf someone verified. thanks guys, much appreciated.


i'll definilty keep you guys updated on what works
User avatar
s.r.v.
 
Posts: 34
Joined: 12 Jan 2008, 19:17
Has thanked: 0 time
Have thanks: 0 time

Postby audioguy » 26 Jan 2008, 04:50

Im building one right now using Madbeans layout... I'm all out of 9v Zeners, but I have some 8.2v. Can I use them without any problem?

Thanks!
audioguy
Resistor Ronker
 
Posts: 260
Joined: 27 Nov 2007, 15:47
Has thanked: 24 times
Have thanks: 6 times

Postby nokaster » 27 Jan 2008, 14:25

finally i 2 can confirm igloo's vero layout is A-OK!

i tried this one with BS250 transistors, swapping the poles of the elco's and diodes, but somehow it didn't work...

i'm a futurlec shop a holic and i received some bs170's friday, stuck them in there and swapped the elco's and diodes around, works like a charm!

i did the 1N4001 like on torchy's layout instead of the igloo way however.

not a bad sound from this circuit...
nokaster
Solder Soldier
 
Posts: 153
Joined: 07 Oct 2007, 17:46
Has thanked: 0 time
Have thanks: 0 time

Postby Igloo » 28 Jan 2008, 10:29

I am pleased to see your build worked out, Nokaster.

It's always good to have further verification...

My layout (page 1) the conscious addition of a little more space, to accommodate the realities of various cap sizes.
It's very tempting to compact the tightest layout on the drawing board. I have had to learn to give the boards a little more room for this purpose.
Please post a pic or two, if you have time.

Anyway, well done!! :D
Igloo
Solder Soldier
 
Posts: 171
Joined: 08 Jul 2007, 10:33
Has thanked: 0 time
Have thanks: 2 times

Postby twostring » 28 Jan 2008, 21:00

I cannot seem to find a 1N5187...what alternatives are there. I've searched mouser and can't seem to find any 9V diodes. I'm much the noob when it comes to sourcing out these parts. Any help would be appreciated.
twostring
 
Posts: 9
Joined: 22 Aug 2007, 15:54
Location: Houston
Has thanked: 0 time
Have thanks: 1 time

Postby Igloo » 28 Jan 2008, 23:31

Hi Twostring,

The In5187 is there, only because it appears on the ZVex schem.
You can sub in any of the 1n400(1,2,3). It's only serving as polarity protection.
Igloo
Solder Soldier
 
Posts: 171
Joined: 08 Jul 2007, 10:33
Has thanked: 0 time
Have thanks: 2 times

Tune the Bass Response?

Postby Grimgrim » 29 Jan 2008, 23:20

Does anybody have any suggestions on what changes you might make to reduce the bass response of this pedal? I am a relative noob, and have a few meager thoughts, but would like some input from you wonderful folks who really know this stuff. Thanks!
Grimgrim
 
Posts: 1
Joined: 08 Jan 2008, 17:53
Has thanked: 0 time
Have thanks: 0 time

Postby bajaman » 30 Jan 2008, 00:17

to reduce the bass response of this pedal?

try reducing the coupling capacitors - try half the original values and see or hear what it sounds like :wink:
bajaman
User avatar
bajaman
Old Solderhand
 
Posts: 4356
Joined: 26 Jun 2007, 22:18
Location: New Brighton, Christchurch, NZ
Has thanked: 461 times
Have thanks: 1590 times

Postby twostring » 30 Jan 2008, 15:41

Igloo wrote:Hi Twostring,

The In5187 is there, only because it appears on the ZVex schem.
You can sub in any of the 1n400(1,2,3). It's only serving as polarity protection.


Thanks Igloo...like I said, I'm a noob, but I'm learning a lot from this forum. Every post is like another day in school for me :D
twostring
 
Posts: 9
Joined: 22 Aug 2007, 15:54
Location: Houston
Has thanked: 0 time
Have thanks: 1 time

Crackle not okay

Postby earthtonesaudio » 12 Feb 2008, 03:48

Regarding the posts about fixing the "crackle okay" control, I saw something about this posted by Roger Mayer, I believe...

Can't post links yet, but I don't remember where I saw it anyway. But the solution was somewhat similar to the fuzz face gain control:

Stick a large value cap between the crackle pot and ground, and parallel all that with a 10k resistor.

I haven't tried this, but if Roger Mayer said it then it must be true, right? :shock:
earthtonesaudio
Transistor Tuner
 
Posts: 1256
Joined: 28 Jan 2008, 05:00
Location: Bloomington, Indiana
Has thanked: 17 times
Have thanks: 109 times

Postby earthtonesaudio » 14 Feb 2008, 02:03

Never mind, I just found the thread that goes over how to de-crackle the control. Current mirror. Go figure.
earthtonesaudio
Transistor Tuner
 
Posts: 1256
Joined: 28 Jan 2008, 05:00
Location: Bloomington, Indiana
Has thanked: 17 times
Have thanks: 109 times

Re: Tune the Bass Response?

Postby orogeny » 23 Feb 2008, 21:07

Grimgrim wrote:Does anybody have any suggestions on what changes you might make to reduce the bass response of this pedal? I am a relative noob, and have a few meager thoughts, but would like some input from you wonderful folks who really know this stuff. Thanks!


I wish ZVEX would incorporate some kind of bass reduction into the standard circuit because the tubby bass made the pedal useless IMO.

My question is WHY does the bass response increase as the gain goes up. This seems odd to me and the BOR is the only pedal I am aware of that does it. I own a BSIAB and it does something similar I suppose but the bass never gets overbearing and is perfect when the pedal is in the sweet spot.
orogeny
 
Posts: 30
Joined: 15 Dec 2007, 23:18
Has thanked: 0 time
Have thanks: 0 time

PreviousNext

Return to Boutique Stompboxes dissected...

Who is online

Users browsing this forum: 287m, doug deeper and 26 guests