Way Huge - Pork Loin  [traced]

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gigelmargel
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Post by gigelmargel »

johnk wrote:well, since no one has replied, I just bought another one for analysis. it should be here next week so hopefully I can get to the bottom of what the problem with the posted schematic is.
You're wonderful, John! If you want, after you will trace it, we can try to make a trade :)

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johnk
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Post by johnk »

okay, the original arrived and I found all of the issues with the schematic and IvIark's vero. YAY!!!!
here's a copy of the schematic with all of the correct values and with the 'voice' trimpot removed (just like in the original:

Image

and here's IvIark's corrected and verified vero of it:

Image

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johnk
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Post by johnk »

got my clone all boxed up and it sounds just like my original one. thanks for posting the vero IvIark!

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Image

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Intripped
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Post by Intripped »

very nice pedal!
...those WHITE LETTERING, pliz explain: how you do it? :secret:

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johnk
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Post by johnk »

Intripped wrote:very nice pedal!
...those WHITE LETTERING, pliz explain: how you do it? :secret:
I used a brother p-touch labeler.

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jalmonsalmon
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Post by jalmonsalmon »

johnk wrote:
Intripped wrote:very nice pedal!
...those WHITE LETTERING, pliz explain: how you do it? :secret:
I used a brother p-touch labeler.
Very nice! Good work!

May I ask what you use for the top coat over the P-Touch Labeler? :secret: I have too many dark colored pedals that need the white fonts! :thumbsup

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johnk
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Post by johnk »

I don't use any top coat. just the labels.

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LaceSensor
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Post by LaceSensor »

That's a legit looking clone

Nice work everyone

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GodSaveMetal
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Post by GodSaveMetal »

early.memoirs wrote:PL has a lower clipping level, much lower gain though.
i find the curve control really muddied up the sound, you have to blend the clean stage in about 1:1 to get it a bit clear.
early.memoirs wrote: Had just finished a double sided layout for 1590B enclosure if anyone interested (a bit cramp). I haven't build it myself. Maybe in a week or two.
havent had a chance to build that board. since it utilizes 9mm pot which actually hard to find here :slap:
so i made a second attempt on my layout. the goal is to fit it in 1590bb, utilizing board mounted pots + toggle switch. lot of jumpers to keep it single-sided. :oops:

here's the composite.
foray-earlymemoirsdecember2011.jpg
report back soon along with the project file. :wink:

Please post alll!!! BOM, PCB layout one sided PCB please!!! thanks I stay tunned!!

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jwyse
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Post by jwyse »

I just finished* building this using IvIark's vero layout. I had (and am having) some trouble with the 1uF caps. I used big honkin' metal film box caps in 2 places where I could physically fit them. Then I figured out that if I socketed the remaining 1uF box caps, that raised them up enough to clear nearby components, so I could fit the rest that way. And that worked just great, until I tried to close the 1590BB. :cry: There isn't enough clearance with the pots+plastic dust covers+doublesided tape+PCB+socket+bigass box cap. I even removed the doublesided tape (it wasn't sticking to the plastic pot dust covers anyway; anybody got any tips for that??), and the caps still wouldn't fit.

I came back to this thread for johnk's photos, and it looks like those yellow-orange 1uF caps are tantalums (at least they look exactly like the handful of tantalums I have). I've never actually used tantalums before; I just ordered some as soon as I had trouble cramming the box caps in. Do the tantalums work/sound ok here, and if so, can someone help me out with polarity? Whenever I've seen electrolytics in the audio path, they've almost always been oriented with positive on the input side, negative on the output side. Is it that straight-forward?

Am I correct in thinking that all these 1uF caps in the Pork Loin are functioning as coupling capacitors? I just read that tantalums "should be avoided in audio coupling (bipolar) circuits" (AMZ's cap FAQ) -- does this apply here?

Sorry for cramming so many questions into one post. Thanks to anyone who has the patience to read and answer at least some of these.


* sort of finished

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johnk
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Post by johnk »

I used 1u multilayered (bipolar) ceramics. they are NOT tants.
both tayda and mouser have 'em.

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Post by ZombiCrow »

Hello! If you were going to put a Send/Return insert point to splice before the Clean section of the Pork Loin (maybe a Swollen Pickle, for example), at what point in that schematic would it be best to patch it in? Ideally I'm looking to use a heavier drive pedal before the Clean preamp section, and still have the overdrive section in parallel. Hope this makes sense, thanks very much to everyone for this thread!

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fusionid
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Post by fusionid »

In an attempt to contribute since I have found great info in this threads.

I recently bought a 2nd pork loin to run a stereo rig (long story). I was surprised that the newer pedal was noticeably brighter. I walked the circuit and found that

Capacitor C34 has been updated to a value of 220 pF

It makes the pedal brighter and is worth the try for those that find the original too dark. Cheers and heads off to tripps for my all time favorite od pedal.

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gigelmargel
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Post by gigelmargel »

Anyone has a PCB for Pork Loin?

Thank you!

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modman
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Post by modman »

Attachments
Pork Loin Guts
Pork Loin Guts
way-huge-pork-lion-guts__30359.1517614862.jpg (31.6 KiB) Viewed 7913 times
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x-tn
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Post by x-tn »

I didn't like the way that schematic is arranged. So, I tried to tidy it up.
Attachments
Porky Lion sch.gif

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FeVeR2112
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Post by FeVeR2112 »

Does anyone know what the omitted voice pot was or how it affected the circuit? The schematic here doesn't include it so can't see where it was fitted in.

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x-tn
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Post by x-tn »

FeVeR2112 wrote:Does anyone know what the omitted voice pot was or how it affected the circuit? The schematic here doesn't include it so can't see where it was fitted in.
See the (incorrect) schematic on page 2:
https://www.freestompboxes.org/viewtopic ... 20#p170819

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johnk
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Post by johnk »

BTW, i also managed to fit it in a 1590B so made another one with a relayed true bypass:

Image

Image

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FeVeR2112
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Post by FeVeR2112 »

Johnk: Very nice shiny box.... how do you do your graphics? Looks engraved or etched...

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