PedalPCB Pastel Preamp/JHS Crayon

OD is Glorious

Well-known member
Build Rating
3.00 star(s)
Edit: there may be an issue with R 37 and R 38. I was just reading this thread. Just recently I started following the board unless there was a note somewhere saying it was incorrect. Seems there’s a disconnect between the Pastel board and the build docs but no note on the build docs.

I pulled this one off of the scrap pile. I had it populated but I lifted the board in one spot and it needed attention so I set it aside. I remembered when I started that a member here told me to save my non-working boards because I would gain the skills to figure them out later. That was good advice and I have saved two different boards so far.

I had this enclosure completed last month and it was a labor of love that turned out sort of ok. For the enclosure I primed and then painted with about 5 different colors. I then sanded and exposed alternating layers, and added decals... then I cleared over everything and then buffed with compound. Looks a bit like a ransom note, but you can get the flavor of what I was trying to do. Colors...like crayon or pastel. Luckily I had most all of this work done weeks ago. For what this pedal does, there are just too many components and the build is too tight. I guess too tight for a guy with one fully functioning hand.

Too many resistors and 22u caps. The end result is meh. My least favorite circuit here is the Fudge Round Fuzz and I would add this one to my list of least favorite. It is flubby when you crank the preamp past 3:00. It gets hi/lo with switches and not too much else: either really screamy high, or incredibly low. It has some compressed distortion capability and some boost capability but other pedals do those things better.

Beyond the paint, I added multi-colored buttons and colored switch caps. Inside the jacks are Lumberg and the LED is a 5mm Orange diffused. My deviation from build docs had to do with the hard-to-find 2N6429. I used MPSA18 in place of them and maybe that is the cause of the flub? I double checked all of my components. In any event it works and makes useable sounds.

IMG_0123.jpeg IMG_0124.jpeg
 

Attachments

  • IMG_0129.jpeg
    IMG_0129.jpeg
    307.2 KB · Views: 6
  • IMG_0128.jpeg
    IMG_0128.jpeg
    362.7 KB · Views: 7
  • IMG_0127.jpeg
    IMG_0127.jpeg
    297.3 KB · Views: 5
  • IMG_0126.jpeg
    IMG_0126.jpeg
    304.1 KB · Views: 4
  • IMG_0125.jpeg
    IMG_0125.jpeg
    352.6 KB · Views: 4
Last edited:
Great job on the paint — totally looks like crayon colouring.

You certainly are one of the most prolific builders on the forum, currently — mentored by @MichaelW ?
No, he is a great builder though. For me it is just because I am retired and keep myself busy with hobbies... this one is fun. I do watch Michael's work to see what I may like to build. These build reports posted by members are key for me to see pitfalls in builds.
 
Last edited:
There may be a problem with R 37 and R 38. The pedal PCB board follows the schematic. But the build documents have the two resistors opposite the board and schematic.

IMG_0131.jpeg IMG_0132.jpeg
 
Last edited:
There may be a problem with R 37 and R 38. The pedal PCB board follows the schematic. But the build documents have the two resistors opposite the board and schematic.

View attachment 114416View attachment 114417
That won't make a difference because it just switches between the two values. Only thing it would change is the direction of the switch. It's ok to not like a pedal. Most pedals are disappointing.
 
No you haven't made a mistake - there is flub galore in this circuit. It is based on something which isn't designed to be a guitar pedal. It's supposed to sound like crap. Only for me it's not the kinda crap I wanted - I was hoping for a different crappiness of crap.

And I wholeheartedly agree that most pedals are disappointing. That is one reason why I don't go to the trouble of graphics I use my inbuilt sense of minimalism on the aesthetic approach to pedal construction. I reuse enclosures at an alarming rate.
 
No you haven't made a mistake - there is flub galore in this circuit. It is based on something which isn't designed to be a guitar pedal. It's supposed to sound like crap. Only for me it's not the kinda crap I wanted - I was hoping for a different crappiness of crap.

And I wholeheartedly agree that most pedals are disappointing. That is one reason why I don't go to the trouble of graphics I use my inbuilt sense of minimalism on the aesthetic approach to pedal construction. I reuse enclosures at an alarming rate.
You are the @MichaelW of Oz 😂
 
That won't make a difference because it just switches between the two values. Only thing it would change is the direction of the switch. It's ok to not like a pedal. Most pedals are disappointing.
Not strictly speaking true, because the switch is a DPDT that also changes the resistance coming from VREF. So if I understood it correctly, it lowers the headroom of the op amp when the high pass frequency is set to a higher value (so less bass). Technically it could cause flubbiness if you instead have "more bass and less headroom" or "less bass and more headroom", when it was intended to be the other way around.

However, like OD is glorious already said, the board follows the schematic, so it seems to be the correct way around if you follow the board values - less bass, less headroom, or with the switch in the other position more bass and more headroom.
 
Back
Top