Vactrol Housing - 改编版

Vactrol Housing - remix of thing:3898263

2023-08-20 20:28:32

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Summary

I recently built a synthesizer module which needed 8 vactrols. It can be difficult and expensive to source reliable vactrols so I decided to make my own from from flat-topped LEDs and LDRs. In particular, the use of a flat-topped 5mm LED allows the assembled vactrol to fit within the footprint of a VTL5C vactrol in KiCad.

The excellent Vactrol housing by pnoreck was a great starting point but needed a bit of tweaking for my needs, so I

reduced the length to work with a flat-topped LED with the LED & LDR touching when the housing is assembled
reduced the gap between inner and outer sections for a tighter fit when printed on my Ender 3
reduced the size of the holes for the LED & LDR leads
adjusted the spacing of the LDR lead holes
added a 'polarizing bevel' to match the KiCad footprint

I've also included a custom KiCad footprint (Custom_vactrol.kicad_mod) with slightly larger holes and improved lead spacing compared with the default component, and also a 3D model (vactrolModel.step) for use in Kicad.

Added 13-09-23 - vactrol-housing_LH.stl and vactrol inner_LH.stl have 10% larger holes for the LED/LCD leads, with a flare on the inside to make it easier to insert the components if you have trouble with the original housings.

Print Settings

Printer brand:
Creality
Printer:
Ender 3 Pro
Rafts:
No
Supports:
No
Resolution:
0.2mm
Infill:
25%
Filament brand:
Any
Filament color:
Black
Filament material:
PLA

Post-Printing

Assembly

Slide the LDR into the vactrol_inner and the LED into the vactrol_housing. The short leg of the LED should go through the hole nearest the bevelled corner in order to match the Kicad footprint orientation. Slide the inner and housing together keeping the LDR leads parallel with the base of the vactrol.

There is enough space around the leads for light to leak into the housing and affect the resistance of the LDR, so it's worth sealing around the leads with a drop of black paint. I used a water-based acrylic paint. If the fit of the inner and outer components is a little loose either use a drop of glue, or paint thickly over the join.

I recommend using black filament to print the housing. If you use a different colour then it will be best to paint the entire housing black if there's any chance of external light shining on the vactrol.