YATS Overdrive (CJOD Lite)

Post by **modman** » 03 Apr 2008, 01:38

paulc wrote:
modman wrote:
briggs wrote:I'd be interested in trying the OPA2134 in a timmy circuit that has LED's instead of the 1N914 diodes. I prefer the sound of a stock timmy to a stock TS.
Note the original Timmy tweak of making R2 = 12k, no other YATS has that.
Modman - not sure where you got your info from - it's incorrect. Tim/timmy never had any 12k resistors in them. Are you talking about a mod that some guy named "timmy" came up with, and not my pedals?? If so I'm sorry for saying you're incorrect

The voltage divider in the tim/timmy pedals is 8k2/10k. Unlike the "yats" designs tims don't have an active opamp EQ section. They use a flat responce opamp gain stage on the output to bump up the output level. The 8k2/10k values were used to allow max clean headroom out of that stage. A standard 50/50 divider would cause asym rail clipping. The values I used came from scoping out the design, and designing for max headroom.

I'm sure you could hear the difference between a 8k2/10k and a 10k/12k. Really seems like I made you day here

Just this one: "not sure where you got your info from" ..... from a website dedicated to showing you can tweak a $10 junk pedal into any funky boutique circuit. It's unbelievable (but I said this from the beginning) that that place in now overtly turning into a ground for pedalmakers to show off and even shift pedals to people who say they could build them. Another guy just learned about Timmy pedals thanks to this thread, and this thread wasn't even about that one...

Yeah, I admit to being 2k off, only posted the idea in this thead to have more people testing it out.

MoreCowbell · Post by **MoreCowbell** » 03 Apr 2008, 02:12

analogguru wrote:Do you think that it could be possible that you misunderstood my rolling eyes a little bit?

analogguru

Maybe...

Do you think its possible that I could have translated it correctly ?

Its all in perception, and the way it was "perceived" by me was that it was a cheap shot at a guy who was giving info on his pedal in this thread. Maybe thats not how you meant it, but thats the way it seemed...so I thought I'd share my experience with getting one of his pedals, which I am certainly entitled to do.

If I come off a bit harsh, it may be because I had surgery yesterday and I'm in a bit of pain...so I apologize for that.

paulc · Post by **paulc** » 03 Apr 2008, 03:43

modman wrote:
I'm sure you could hear the difference between a 8k2/10k and a 10k/12k. Really seems like I made you day here Just this one: "not sure where you got your info from" ..... from a website dedicated to showing you can tweak a $10 junk pedal into any funky boutique circuit. It's unbelievable (but I said this from the beginning) that that place in now overtly turning into a ground for pedalmakers to show off and even shift pedals to people who say they could build them. Another guy just learned about Timmy pedals thanks to this thread, and this thread wasn't even about that one...

Yeah, I admit to being 2k off, only posted the idea in this thead to have more people testing it out.

Modman I don't see where you're coming from with this. You said a timmy pedal had a 12k resistor in it, and I said it didn't. I was doing nothing more than giving accurate info here. That's what this place is about right? For all the talk about builders giving out misleading info I'd think you'd want those that were willing to be nothing but factual when posting.

And no - I don't think I could hear a difference between 8k2/10k and 10k/12k. Both of those give a 45% bias tap which is what I CAN hear, and see plain as day on a scope. Again - I was just giving accurate info about a parts value. No showing off here. It's basic electronics, and I've always said so.

I have NEVER used this site to sell my stuff. I even made it easier for guys here to build their own by correcting errors on the schematic. When morecowbell wanted one the first thing I told him was he could build one himself with the info here. He said he would rather get one from me, so I made him one. You have never - and will never - see me trying to sell gear here.

And believe me - it takes more to "make my day" than correcting a parts value you gave. I'm not that shallow.

Later, PaulC
Tim & timmy pedals

analogguru · Post by **analogguru** » 03 Apr 2008, 05:51

As you can see in this schematic:
https://www.diystompboxes.com/pedals/dist10.gif

the "45%-bias-divider" isn´t any real new invention and well known since the 70´s to achieve the maximum headroom of bipolar opamps.

Maybe...

Do you think its possible that I could have translated it correctly ?

Maybe....
I am sorry, that this didn´t come clear..... but minor7th doesn´t seem to know PaulC´s Timmy, for this I suspected too that he is not a hardcore pedal builder and maybe it could be easier for him to buy and use an already built one ?
I thought this was misunderstandable from the context.

analogguru

MoreCowbell · Post by **MoreCowbell** » 03 Apr 2008, 14:11

analogguru wrote:
Maybe...

Do you think its possible that I could have translated it correctly ?
Maybe....
I am sorry, that this didn´t come clear..... but minor7th doesn´t seem to know PaulC´s Timmy, for this I suspected too that he is not a hardcore pedal builder and maybe it could be easier for him to buy and use an already built one ?
I thought this was misunderstandable from the context.

analogguru

Like I say, I'm on Vicodin to kill pain right now, so my comprehension may be a bit "hazy"....that combined with the constant hurdle of languages, the written word, etc....

paulc · Post by **paulc** » 03 Apr 2008, 15:54

analogguru wrote:As you can see in this schematic:
https://www.diystompboxes.com/pedals/dist10.gif

the "45%-bias-divider" isn´t any real new invention and well known since the 70´s to achieve the maximum headroom of bipolar opamps.

You're right - it's not a new bias invention, and I've never said it was. I've seen it in lots of other things myself. It's just something I do, and I've never tried to hide it as a special trick of mine...

I know you know this AG, but others might not... It's common knowledge that electronics "math" is built around ideal/perfect models. In the real world it's very hard to have theoretical perfect parts. The math isn't always spot on when the parts are not perfect. So the practice since day one is to build the circuit, hook up the meters and scopes, and tweak for optimum performance. That's all I did with the bias tap - no secret mojo going on.

modman wrote: Another guy just learned about Timmy pedals thanks to this thread, and this thread wasn't even about that one...

Modman, I want to clear something up. I didn't try to take over this thread and bring attention to my stuff. Briggs brought it up first, and then you posted your comment. All I did was reply to your comment, and offer Briggs a suggestion in regards to his. Again - I would never try to use this site for bringing attention to my stuff. But i do feel i have the right to reply when info about my products, or myself, is incorrect. So you can rest assured I wont abuse your site to further my goals of bootweaker world domination. Truce??

Later, PaulC
Tim & timmy pedals

analogguru · Post by **analogguru** » 03 Apr 2008, 19:14

@paulC
please relax...... all things would be a little bit easier if you wouldn´t take everything as a personal atack.

What is bad if somebody new learned to know your pedals ? What´s the problem if he buys one.... ?

So you don´t have to apologize if you present your point of view about your pedal.... even if this is not in the Timmy thread.

And also the mention of the earlier source concerning the "45%-bias-divider" was not intended as an offense against you, it was more an info for modman.

analogguru

paulc · Post by **paulc** » 03 Apr 2008, 20:19

analogguru wrote:@paulC
please relax...... all things would be a little bit easier if you wouldn´t take everything as a personal atack.

What is bad if somebody new learned to know your pedals ? What´s the problem if he buys one.... ?

So you don´t have to apologize if you present your point of view about your pedal.... even if this is not in the Timmy thread.

And also the mention of the earlier source concerning the "45%-bias-divider" was not intended as an offense against you, it was more an info for modman.

analogguru

Hey AG,

I didn't really take what you said in this thread as an attack at all. You were sharing info, and so was I. I love nothing more than getting into tech geek speak with others. But I will be honest - in the past there's been so much talk about builders not having the ability to do anything close to design work that when I see the talk about "nothing new - been done" in regards to this stuff it can get my back hair standing up.

It was the comments modman made concerning his issues with builders drawing attention to their builds in order to make sales that i wanted to be clear on. I just wanted it known that what i was doing was responding to comments, and not trying to abuse his site.

"that's all I've got to say about that"

Later, PaulC
Tim & timmy pedals

Post by **modman** » 04 Apr 2008, 01:07

Paul,

I thought the bias config of the Timmy was quite original - of course it is not in a strict sense - but it might have been for people not so deep into electronics. I really didn't mean to say that you are using the forum to sell pedals, but rather that general judgement of the forum on your pedals hasn't been bad at all. In my ignorance with regard to electronics history (thanks AG) I even called that 45% voltage divider the timmy tweak, and just suggested these values without really looking at the timmy schemo.

Truce allright

noelgrassy · Post by **noelgrassy** » 26 Apr 2008, 15:03

You've gotta admit, Paul C seams to be more than just a "stand up" guy. His gentile and thoughtful pontifications
could be some of the best examples of the real spirit of this kooky site.

I really like it here!

paulc · Post by **paulc** » 30 Apr 2008, 20:07

noelgrassy wrote:You've gotta admit, Paul C seams to be more than just a "stand up" guy. His gentile and thoughtful pontifications
could be some of the best examples of the real spirit of this kooky site.

I really like it here!

Well - I don't know about being a "gentile". I tend to think of myself as a long winded "putz" actually.

Later, PaulC
Tim & timmy pedals

culturejam · Post by **culturejam** » 01 May 2008, 15:32

paulc wrote:Well - I don't know about being a "gentile". I tend to think of myself as a long winded "putz" actually.

Oy vey!

(and this is coming from a complete goy)

narin_fender · Post by **narin_fender** » 03 Jul 2008, 08:21

Thank alot for your schematic...

I thought it look like landgraff ...No buffer in-out

cool>>>

destro · Post by **destro** » 16 Jul 2008, 02:49

Built it. Sounds superb through my Traynor YBA-1A. Thanks for the schem and layout.

95strat · Post by **95strat** » 28 Sep 2008, 03:18

Finally got this thing built. I really like the tone of this TS. It will replace my Keeley. Has more drive and tone range and not as smooth. Thanks for sharing Deaj.

Chris Burnell · Post by **Chris Burnell** » 26 Oct 2008, 23:49

Total noob here.

I want to wire up a rotary switch to change clipping options in Mr. Deaj great YATS Overdrive / CJOD Lite project. I am new to pedal building and this will be one of my more ambitious projects. I think I have things strait in my head but I have this diagram to show what I think I want to do. So I submit it to the people in here that are for smarter than I am with this than I am.

Am I on the right track or am I a lost cause? And sorry for the messy drawing it is the best I could do with what I have.

Thanks,

Mr. G. · Post by **Mr. G.** » 03 Nov 2008, 18:41

I just built this pedal, and am loving it so far. I think I might have a slight problem though. The tone control isn't super noticeable between 7:00 and 4:00 (it does have an effect, but it's not a big one), and then once you pass 4:00 it jumps to being really bright with no real in between. Any idea what could be causing this?

The only thing I did different was that I built it on vero board rather than perf. It only needed some very slight adjustments. Here's the layout I made: YATS vero
The blue "jumper lines" of D1 and C6 actually represent their leads under the board. J18 is the input, A1 is the +9v, B1 is Ground, and Level 2 is the output. There are hard to see trace cuts under R7, C8, C7, and R5. Hopefully there aren't any errors in my layout that are causing the tone control to act like it is.

danielzink · Post by **danielzink** » 04 Nov 2008, 02:09

The only thing I did different was that I built it on vero board rather than perf. It only needed some very slight adjustments. Here's the layout I made: YATS vero
The blue "jumper lines" of D1 and C6 actually represent their leads under the board. J18 is the input, A1 is the +9v, B1 is Ground, and Level 2 is the output. There are hard to see trace cuts under R7, C8, C7, and R5. Hopefully there aren't any errors in my layout that are causing the tone control to act like it is.[/quote]

Alpha 16mm Single-Gang, Reverse Audio & "W", Solder Terms
1/4" diameter, smooth shaft. "W" Taper is Tone pot for the Tube Screamer.
PRICE: $2.75

http://www.smallbearelec.com/Detail.bok?no=116

These are quotes from a thread over at DIYstompboxes :

My DIY TS builds all have 22k linear tone pots, and seem to have better range, though about
half the pot still seems "dead" !
We need to solve that one

The TONE control however has lots of tone crammed into the last 1/8th.
Seriously, I have the same problem on every TS, I'm not sure if I'm using the wrong taper or what. I know that the original TS808 calls for a 20k pot (which I made using a resistor in parallel with the outer lugs of a 50k pot), but I'm using an audio taper so that might be the problem. Try finding a resistor to go in parallel with the outer lugs of your tone controls pot (doing a little math gives me 33.3, so a 33k resistor in parallel would do the job fine). I think if you were to use a linear taper, that problem at the end of the pot would still be there, but I could be wrong here. I do find it kind of annoying to have to tweak the tone control so carefully

Didn't Steve @ SB get those...what were they?
20k 'TS' Tonepots !!
something like 20k reverse analog but wierder than that even..whatever..TS requires a 'wierd taper' tonepot to get 'smooth/even over the range' tone control control.

Yup i know that W taper. But it seems expensive and is not easy for me to order it as i am in Asia region.
I would like to know if there is an alternative except using that W taper.

Not exactly.
You can try putting resistors across a 50k or so pot, to bend it's taper/reduce it's value [someone mentioned 33k fixed resistor].
I used two 10k pots once in place of the 20kw.
Someone re-worked the TS circuit to respond better to a standard type TC pot IIRC...Stompbox Alexa...I don't know if it's around though/google.

Honestly, I'm fine with how the tone control works. I'm using a linear taper pot and it gets really touchy towards the end, but as long as it gets me where I need to go I don't really care. I've never been too particular about what taper I use, but I try to use the correct one when possible.

hth, Dan

Mr. G. · Post by **Mr. G.** » 04 Nov 2008, 02:26

Thanks a lot Dan! Guess it's working like it's supposed to then. I guess I'll have to try out that W20K pot to see if that helps.

kurtlives · Post by **kurtlives** » 08 Nov 2008, 17:18

Mr. G. wrote:Thanks a lot Dan! Guess it's working like it's supposed to then. I guess I'll have to try out that W20K pot to see if that helps.

Before you go buy a W pot try a 2K(B) pot

.