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building a 2X passive LPG/LPF to figure out PCB panel fab
MUFF WIGGLER Forum Index -> Music Tech DIY  
Author building a 2X passive LPG/LPF to figure out PCB panel fab
bmoren
I wanted to work on building a simple module from start to finish to test out some panel fab ideas and I thought a LPG/LPF would be a good candidate. After listening to Why We Bleep Ep.2 with Abstract Data and talking about the character of imperfection in analog circuits, I thought making a DIY vactrol based board would be interesting! I also thought if there were 2 halves, you could use slightly different components and vary each to make them truly distinct from one another. You can get different characteristics in the filter depending on the size and material of the LPF capacitor.

Panel font by Alice Savoie / CNAP: http://cnap.graphismeenfrance.fr/faune/en.html CC BY-ND 4.0

Presenting two tone, 2X passive LPG/LPF in 3hp.

PCBs:




Final Assembly:



In my rack:



A quick test track:
[s]https://soundcloud.com/bmoren/twotone-nearness-1[/s]

the snappy bass is the main two tone thing at work with a short gate LPFing & LPGing a Noise Reap Bermuda’s Sine output. the second is coming from the chord organ, but it’s much more subtle. :headphones: or nice :speaker: for best results.

Github repo coming soon with rev2 board (I need to flip the LPF attenuation direction)

https://www.modulargrid.net/e/other-unknown-two-tone
degeneratedsines
applause

It is very nice!
I don't own any LPG yet and would gladly grap a pcb/panel set when availlable.
Monkizzle
Rad work! In these days I'm experimenting with low pass gates too, which values you choose for resistor and cap?
NANO-Jorge
Wow I really like the panel! How did you convert a design file into gerbers? I'm using KiCad but i think that it's not the best option.
bmoren
NANO-Jorge wrote:
Wow I really like the panel! How did you convert a design file into gerbers? I'm using KiCad but i think that it's not the best option.


This was done in Kicad, lots of exporting layers form Illustrator into the footprint creator...
bmoren
Monkizzle wrote:
Rad work! In these days I'm experimenting with low pass gates too, which values you choose for resistor and cap?


For the LPF it's a 4.7uf cap and a A10K pot.

for the LPG it's a DIY vactrol with a 5mm white LED + a 47k-100k LDR / Photo Resistor
tdball
Are the panels/pcb's going to be available anywhere? Looks like a fun DIY project!
Being
Looks Great! Love the color scheme. Any plans to sell pcb or panels?
arechfer
i'm interested in two pcb/panel sets
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