Amptweaker - Tight Metal  [traced]

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Re: Amptweaker - Tight Metal

Postby J0K3RX » 26 May 2013, 22:38

And here's the back... :twisted: I think ya'll can figure out where the LEDS and jacks are... if not, step away cause this thing is a spaghetti bowl full of evil! :twisted:

And here's the Sprint file... Front and back are on the 2 separate tabs at the bottom,TM Front and TM Back...

https://www.dropbox.com/s/jfego3t74mxq1 ... mbined.LAY
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Re: Amptweaker - Tight Metal

Postby jymaze » 27 May 2013, 02:35

The track that just hangs down is actually the ground. Not totally sure why it is like that, but it may actually be the lamest attempt at a copper-fill known to man...

That thing twisted my brain good when extracting the schematic, but after all, it is not that bad of a circuit, pretty easy to understand. At least it is original, not a spin-off of a TS, BSIAB, or a Guv'nor. Just for that, kudos to the designers!
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Re: Amptweaker - Tight Metal

Postby azrael » 27 May 2013, 03:33

Thanks for all the work, guys!

So the gain pot is dual ganged?
I may have missed it, but what are the two sets of pads? One is an FX Loop, but there are two?

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Re: Amptweaker - Tight Metal

Postby J0K3RX » 27 May 2013, 04:45

azrael wrote:Thanks for all the work, guys!

So the gain pot is dual ganged?
I may have missed it, but what are the two sets of pads? One is an FX Loop, but there are two?



A little late to the party I see... wtf took you so long?

Just joking hardy har har... :lol: :lol:

Yes, it is dual ganged gain/gate pot... The gate increases with increase in gain, kinda cool dont'cha think! That's why you see 2 sets of pads.

The FX loop is before and after the effect via a switch on the bottom of the board... Just one loop that toggles to the front or to the back

And the best part, lots a pretty little LEDS strung across the board like Christmas lights.... :lol:

By the way, you any good at laying out circuits? :hmmm:
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Re: Amptweaker - Tight Metal

Postby J0K3RX » 27 May 2013, 04:54

jymaze wrote:The track that just hangs down is actually the ground. Not totally sure why it is like that, but it may actually be the lamest attempt at a copper-fill known to man...

That thing twisted my brain good when extracting the schematic, but after all, it is not that bad of a circuit, pretty easy to understand. At least it is original, not a spin-off of a TS, BSIAB, or a Guv'nor. Just for that, kudos to the designers!



No need for copper fill on this mutha... It's about 75% filled up with copper spaghetti anyway!

Agreed on the kudos to the designer!! This is just about what I have always been looking for... I think the Tight Rock might be better for leads, gonna have to get one and rip it up! I really like the sound demos of that one also!!
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Re: Amptweaker - Tight Metal

Postby coldcraft » 27 May 2013, 13:43

with the clipping arrangements, I would encourage someone to plug in a TLC2262 at 9v and see how it sounds, just don't put in 18v, it will fry.
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Re: Amptweaker - Tight Metal

Postby azrael » 27 May 2013, 15:31

J0K3RX wrote:
azrael wrote:Thanks for all the work, guys!

So the gain pot is dual ganged?
I may have missed it, but what are the two sets of pads? One is an FX Loop, but there are two?



A little late to the party I see... wtf took you so long?

Just joking hardy har har... :lol: :lol:

Yes, it is dual ganged gain/gate pot... The gate increases with increase in gain, kinda cool dont'cha think! That's why you see 2 sets of pads.

The FX loop is before and after the effect via a switch on the bottom of the board... Just one loop that toggles to the front or to the back

And the best part, lots a pretty little LEDS strung across the board like Christmas lights.... :lol:

By the way, you any good at laying out circuits? :hmmm:

Ah, I see! Man that one at the end is kind of useless, no? Might as pull the effect after the actual pedal at that point haha.

And thanks for clearing all that up. :)

As far as layouts....I'd like to think I am? Haha.
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Re: Amptweaker - Tight Metal

Postby J0K3RX » 27 May 2013, 17:22

Hey lukatosh... where are you man? We need your mad genius layout skillz yo!! :lol: I figured you would be all over this like one a hobo on a ham samich :lol:
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Re: Amptweaker - Tight Metal

Postby apollomusicservice » 27 May 2013, 19:40

Congratulations guys at work. Here's my version of Eagle file, since I could not open an existing I drew again the scheme according euronymous0001. :thumbsup
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Re: Amptweaker - Tight Metal

Postby bajaman » 27 May 2013, 21:37

Hi folks - I've been redrawing Jim's Sprint layout file and tidying it up, correcting layer mistakes and component placement etc. It is starting to look really good now :D
One thing I have noticed is the very elaborate biasing chain for the supposed half rail voltages. Do NOT assume that vref is exactly half of the supply voltage at ALL points of this circuit, because IT IS NOT :wink:
The schematics need to be redrawn CORRECTLY to show this fact - there is also a major error with the first decoupling resistor - is it 6k8 or 68k ????? (or possibly 680 ohms perhaps ?).
Very interesting circuit - zener diodes have completely different clipping characteristics to standard small signal types like the 1N4148, 1N914 etc.
I will post my final version of the Sprint layout file soon - have to go to work to make some money to pay some bills now :cry:
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Re: Amptweaker - Tight Metal

Postby bajaman » 27 May 2013, 21:40

The ground trace hanging down is possibly being used as a shield :hmmm:

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Re: Amptweaker - Tight Metal

Postby J0K3RX » 27 May 2013, 21:47

bajaman wrote:Hi folks - I've been redrawing Jim's Sprint layout file and tidying it up, correcting layer mistakes and component placement etc. It is starting to look really good now :D
One thing I have noticed is the very elaborate biasing chain for the supposed half rail voltages. Do NOT assume that vref is exactly half of the supply voltage at ALL points of this circuit, because IT IS NOT :wink:
The schematics need to be redrawn CORRECTLY to show this fact - there is also a major error with the first decoupling resistor - is it 6k8 or 68k ????? (or possibly 680 ohms perhaps ?).
Very interesting circuit - zener diodes have completely different clipping characteristics to standard small signal types like the 1N4148, 1N914 etc.
I will post my final version of the Sprint layout file soon - have to go to work to make some money to pay some bills now :cry:
Cheers
bajaman


Looking forward to it! Mine was kinda sloppy, bad alignment etc.. I just pressed on to get it done...
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Re: Amptweaker - Tight Metal

Postby jymaze » 28 May 2013, 02:29

Yeah Bajaman, the hanging track is probably just a poor-man ground plan as I said above. I agree, the biasing circuitry is more complex than I put on my schematics.I will trace it tomorrow. I just gave up on tracing it, but now Jok3rx confirmed all the tracks, it should be easy. Until proven otherwise, the resistor you talk about is 6.8k. Jok3rx checked them all.
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Re: Amptweaker - Tight Metal

Postby bajaman » 28 May 2013, 03:30

some of the sprint layout tracks are not correct - don't worry though I am on to it :wink:
the bias vref to the volume pot is interesting ( a lot lower than 1/2 the main supply rail voltage :wink: )
cheers
bajaman

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Re: Amptweaker - Tight Metal

Postby J0K3RX » 28 May 2013, 03:34

bajaman wrote:some of the sprint layout tracks are not correct - don't worry though I am on to it :wink:
the bias vref to the volume pot is interesting ( a lot lower than 1/2 the main supply rail voltage :wink: )
cheers
bajaman


Really? :hmmm: let me know which ones and I will double-triple-quadruple check...

I want to nail this thing 100% so, I am willing to remove all the components down to the bare board if that's what it takes! :twisted:
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Re: Amptweaker - Tight Metal

Postby J0K3RX » 28 May 2013, 04:07

Damn-it! I keep getting "connection reset errors" in my browser when trying to get to FSB? I'm in, I'm out, I'm in, I'm out... :evil: Probably my sh!tty excuse for an ISP!
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Re: Amptweaker - Tight Metal

Postby bajaman » 28 May 2013, 07:48

No - I have been having trouble with fsb tonight too. :wink:
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Re: Amptweaker - Tight Metal

Postby jymaze » 28 May 2013, 14:25

Hey Jok3rx,

Sorry to ask again, but I have a problem with that track:

WeirdTrack.PNG


I cannot see it on your pics. You are sure it stand like that? Confirmed with a meter? Why would they just put 2 resistors in series when you can just put one?
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Re: Amptweaker - Tight Metal

Postby coldcraft » 28 May 2013, 16:28

does anyone think the tight rock is just the metal with maybe a 250k Gain knob and different tone stack values?
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Re: Amptweaker - Tight Metal

Postby jymaze » 28 May 2013, 16:39

I will have some minor corrections to the schematics tonight (the PSU, the tone-stack, the T notch filter) but I am waiting on Jok3rx to confirm that damn resistor by the tone-stack (3k32, right under the B10k tone-pot). The tone-stack actually looks more like a BMP-type, and the notch filter had a mistake for one of the 100n caps that should be in series with the thrash switch.
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