PS Boyle's ¬ Law

gtfields13

Active member
I have finished the last new build from my first batch of printed cases. This is the Boyle's¬Law, based upon the Keeley Compressor Deluxe, using the AionFX Aurora Deluxe PCB. (¬ = "not" math symbol).
BL-01 Face.png BL-01 PCB.png
This one took a trip to the Troubleshooting forum first, where @Nic was sharp-eyed enough to point out that I pulled out a tried-and-repeated mistake, installing an electrolytic capacitor backwards. It didn't take me long to replace that capacitor, and the pedal worked fine afterwards.

This is another build that won't have a demo until I can corral a local guitar playing friend to help me out. My chords are fine for a fuzz, but this would just "highlight" my skills. In my hands, I can definitely feel the compression effect, all the controls are pretty intuitive, but still want to compare this to my DAW compressors. If the point is to have a transparent (that is, not obvious) effect this sounds good; in all the settings I think I only found one combination of picked articulation and settings that caused a brief touch of a "wah" sound.

For the build, I did opt for NE5532AP op amps instead of the RC4558P that are the usual chips for this build. I didn't swap out any other components, so it's a very vanilla build. I don't think I could make this much better unless I adapted it to balanced signals which could take advantage of a quieter Op Amp. For guitars, I think the primary source of noise is from the instrument. As a keyboard effect, where I have some gear with balanced output, I can see where improvement could be audible.

The build was easy for me - it's a moderately high parts count like my Argand Plane phaser, but nothing weird other than keeping track of putting the right part in the right place (with the right orientation!). I tried a slightly different routing for the power leads, using an "innie" style with in-line connector that is hidden under the PCB.

I think the graphic is my favorite so far - the visual merging the Phido theme with a compressor came pretty quickly to me. The controls and graphic printed well, but I didn't setup the text properly for printing legibly on a light colored lid. I just need reproduce the settings of the poem title and I think it will be perfect next time.

BL-01 Interior.png BL-01 Lid.png BL-01 Ends.png

And for the name. A compressor's controls map pretty naturally to basic gas-phase physics, with the Boyle's Law relationship of pressure to volume covering exactly what this does. Except that in Physics, more pressure = less volume. So this is a step beyond - it's Boyle's (Not) Law, where more pressure = more volume!

Even thought I've cleared a batch of new pedals, and have duplicate cases on hand to build the 2nd version of each of the first five Phido Sound pedals, somehow my PCB count went up by 8 today. I need to get busy on my case designs to start rolling out more pedals, and am getting closer to my ideas for implementing some of my own custom pedal variations.

If you read this far - thank you - I read your reports and love all the creativity I see here.
 
This is not a pedal. This is art! It has a poem even... Incredible work, truly.

Can you talk about your jack PCBs? I often see custom 3PDT boards, and I've made my own, but I've not seen it for jacks.

And how do you do your graphics, is it screenprinted? The front looks like it could be, but the poem almost seems etched or lasered.
 
This is not a pedal. This is art! It has a poem even... Incredible work, truly.

Can you talk about your jack PCBs? I often see custom 3PDT boards, and I've made my own, but I've not seen it for jacks.

And how do you do your graphics, is it screenprinted? The front looks like it could be, but the poem almost seems etched or lasered.
Thanks for the compliment! I have this brand concept in my head and am trying to execute and improve.

I have made a couple of iterations of jack PCBs so I can use removable connectors to link the boards. I created these in KiCad and have made them using either the DigiKey DKRed service or OSHPark. I am using this to learn about PCB fab, and aside from being US based, the really important benefit is that both of these services can take an uploade KiCad ".kicad_pcb" file directly, so I haven't learned how to convert to gerber files for more general work.

I am happy to share these PCBs with the community. This is also something new to me, and I have attempted to create a Git from which the KiCad files for this (or other PCBs when I upload them) can be downloaded. Here is my first attempt:
PSX004 Neutrik M-Series Lug with JST-PH Connector
If you try to download this, let me know if you are successful. I have a variant for the same style jacks with PCB pin headers as well. If my understanding of Github sharing is approximately correct I will put some of these other jacks there.

Making the PCB was super-easy. I think I was able to download the model for the Neutrik connectors from Mouser (or Neutrik, or maybe it was built into the KiCad library. You can't see the JST connector on the other side, but it's a JST-PH header (2 mm pitch). I did this the first time by accident (instead of the 2.54 mm XH series) but I actually like this size better, it's large enough for me to handle but takes less space on the board. I tried to be clever in the layout so a 2-pin, 3-pin, 4-pin, or 6-pin header can be used depending upon the jack configuration, but I just bought a batch of the 6-pin headers and housings and use them, even when only 2-pins are active.

The graphics are all Tayda UV Print. The face has a matte varnish on top, but the rest don't. The lid looks etched, because I had to take the picture at a shallow angle since it's almost impossible to read under direct, normal lighting. I didn't get the font size/color/fill and outline settings correct in my design.
 
I tried downloading from github, there are only readme and license files there, no actual KiCad.

I love the connector idea, I played with it some a while back but didn't get this far. I may try it again with your PCBs, and maybe make a matching 3PDT one as well.
 
I tried downloading from github, there are only readme and license files there, no actual KiCad.

I love the connector idea, I played with it some a while back but didn't get this far. I may try it again with your PCBs, and maybe make a matching 3PDT one as well.
You might try again. I just uploaded and I think they are there now.

I have versions to upload for these jacks with the larger JST-XH connectors as well.
 
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