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Old 12-23-2013, 08:46 PM   #21
Invader Jim
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The underside of the perf is way too messy to trace with just pics but if you want, I'll post them.

I tied the presence between Q2 B and C, just like you did in your diagram.

Also, I just noticed I left off the bypass cap for Q1.

I usually don't have much if any trouble out of my builds but this bastard has given me more shit than anything else I have built. It's making me look like a noob. *sigh* I think it is just a wiring error or two around Q2 and Q3. the 1k and 27R resistors also get hot. Idk, I'll figure it out eventually. I've been awake since friggin' 2am. That's probably most of the problem there.
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Old 12-23-2013, 08:56 PM   #22
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hey brother,
if you built what was in your schematic, there could be a couple of issues that you may be facing.

i modified your schematic to the values i used, including where i boosted the gain in a couple spots.

the first stage stock just doesn't have enough balls, as you discovered.. so that's good. most likely what's making the tranny overheat is either a backwards electro, waaaay off bias or i'm betting it's the presence circuit.

anyways, other than the trem, this is good:

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Old 12-23-2013, 09:29 PM   #23
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no blocking cap could do it i guess, but i wouldn't think so!!

hmmm... maybe a solder bridge?

get some sleep, it'll look better after ya takes a break jim.
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Old 12-23-2013, 11:37 PM   #24
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1. The 2u2 cap between lug 3 of the gain pot and the base of the second transistor is drawn backwards.
2. The gain pot (in yours and the original schematic) is wired backwards from what I'd expect. This means that the first transistor will be heavily loaded when the gain control is turned down. I think you said at one point that it doesn't really sound good until you turn it up? That could be why.
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Old 12-25-2013, 03:41 PM   #25
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i boxed this last nite, nuked about 99% of the noise.
dude... DOOOOOOOOOD... we gotta get your build running!!!

once it's shielded, you can hear what it's doing a lot better.. from barely a hint of midrange boosted clean to crunch to chunk to drive to scream right from the guitar with all the pedal knobs about half way up.

the video i posted earlier didn't do it justice!!

merry christmas!
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Old 12-25-2013, 07:33 PM   #26
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Merry Christmas to you too, man. I'm gonna get started on this thing again tomorrow. Ill probably just build another if I have the parts. I'm dangerously low on basically everything. I want so badly to get this working. Its been 4 years in the making.
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Old 12-26-2013, 06:06 PM   #27
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what do ya need bro?
pm me, maybe i can help.

taking "miss kay" on her maiden flight tonite.
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Old 12-26-2013, 06:50 PM   #28
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I just need to shore up my supplies of resistors, caps, jacks, pots, and switches. All that requires money, though...

You need to upload another video. I'm curious to see how she sounds with a box and a better amp.
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Old 12-28-2013, 02:42 AM   #29
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used it live last nite, she was pretty epic!! sounded best with the gain about 9:00 and the volume about half... the tone knob isn't quite as effective, but man, this thing pushes other dirt boxes really nice...

i patched it in second in line after my octavia and before my fuzzface (against all convention i know) and it sounded ace.

i normally never turn the face off, last nite i barely used it.

i'll get ya another video as soon as i can bro.
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Old 12-31-2013, 01:53 AM   #30
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Finally got around to making a new layout for this thing. Now I'm going to see if I have the parts to build another. Gonna breadboard it first this time.

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Old 12-31-2013, 02:22 AM   #31
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looks good jim!!! keep me posted bro!!

i hope to get a chance to shoot "miss kay" as i call her thru a REAL amp over the next couple days. got a nor'easter coming, so i'll be able to chill around the house a little hopefully.

i think you're gonna diggit.

what i like best is, tho you can use it as a fuzz, it's really more of a preamp/amp sim. it sounds great all over the dials, and has enough ass to cut thru.

works KILLER pushing fuzz od and distortion.

hey!! happy new years, btw!!
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Old 12-31-2013, 02:28 AM   #32
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Happy new year to you as well, man. Hopefully I'm gonna be rockin by 2014.
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Old 12-31-2013, 04:47 AM   #33
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Oh god he found us.
Hide everybody quick!

Welcome aboard jimi
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Old 12-31-2013, 01:18 PM   #34
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hi rob!!!

did i find you, or did YOU find me???

whooooooooooooooooooooooooooooooooooooooaaaaaaaaaa aaaaaaaa!!!!!!

happy new years bro!!
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Old 12-31-2013, 06:38 PM   #35
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Happy New Years Jimi (Well, I still have about 10 hours to go).
This place is my home base (Or hideout if you prefer ).
I usually hang in in the GG&A helping people and being a smart ass.
But I wander into this one every now and then.

But since I mentioned the Smart ass part.....
HEY INVADER JIM, you ever get around to building a Jordan Bosstone yet?
(That question started the original GB&C Chat thread BTW).
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Old 12-31-2013, 09:21 PM   #36
Invader Jim
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Got all the parts scrounged up and on the breadboard. Been tweaking it for a while now and I have some oddness. To simplify building it I just used fixed resistors to get the collectors close (or close enough) to 1/2 supply. As a result the trimmer on the last transistor wasn't even needed. The 470k there is enough. If I try to put a resistor there, there is a partial gating effect of the distortion (the highest freqs) which I can't stand. Other deviations from your schematic are that I used 1u and 4u7 caps in place of the 2u2 caps, which I don't have.

This is the diagram of exactly how I built it:


You weren't lying when you said it sounded like a cocked wah. Not sure I'm thrilled about that fact. It's got lots of high-end and plenty of volume. It is extremely loud, in fact. Any ideas for how to make this not sound like I'm playing through a wah pedal?

Quote:
Originally Posted by CodeMonk
But since I mentioned the Smart ass part.....
HEY INVADER JIM, you ever get around to building a Jordan Bosstone yet?
(That question started the original GB&C Chat thread BTW).

I did, actually. Couldn't get it to work right. Lots of gating effects.

And I still think it was an inside job. >.>
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Old 12-31-2013, 10:30 PM   #37
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q3 needs a collector resistor... at least something small there. that's probably where the gating is coming from.

the cocked wah thing was only before i got the biasing right... you may have to play with those resistors!!!

the caps should be fine.

this thing is loud as f*c<.... you should be able to get plenty of output volume, the gain control doesn't need to be much above about 9:00 to get a good overdrive. i'm betting you've got the gain cranked and the volume down, that would definitely get the cocked wah thing happening.

i'd try about 1k on q1... and maybe 2k on q2. can ya take me some voltage reading jim?

that would help a lot.

try a si for q3, 3904 is probably fine. the way the circuit is set up, q3 is almost superfluous. it has an effect on tone, but not much, and very little on volume.

it could probably be dropped, but the tone will change some.

looking at it, the only diff really that's noticeable is the lack of bias resistor on q3. i tried it without, but it definitely needs the resistor there or it becomes kinda unstable.

bosstone, huh? i love them things... put a starve control on it and play some trumpet and trombone sounds!!

well, happy new years rob anyways... lol

good to know some things don't change.

jimi.... get me some voltage readings please.
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Old 12-31-2013, 11:35 PM   #38
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Pffft Here is the revised diagram. I just decided to pull Q3. Like you said, it serves basically no purpose. I also yanked all the other junk that had no effect on sound or operation.



The supply is exactly 9v and both transistors are biased to have exactly 4.5v on their collectors. If you need more measurements just say so. The wah thing seems a bit better, noise level is way down, and the subtle gating junk is basically gone. Other than that, the "tonal" changes are literally negligible. The Gain pot needs a series resistor to keep from turning it up all the way so I put one into the diagram. It could also use a treble bypass cap.

I don't know what you mean by "1k on Q1...2k on Q2". Unless you are talking about emitter resistors.

This is why I don't post builds until I finish them.
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Old 12-31-2013, 11:54 PM   #39
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i'm talking about collector resistors. don't fall for the 4.5v bullshit. it WILL make stuff fuzz, but this should have substantially higher voltages than that if memory serves...

you won't need the series resistor on the gain pot once the thing's boxed.

hang on, let me get some voltages offa mine bro

brb
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Old 01-01-2014, 12:01 AM   #40
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Alright man.
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