Orpho D / 8 DIODE FILTER - Eurorack Module on ModularGrid
STG Soundlabs - Sea Devils Filter – Noisebug
EMS VCF clone
Backlight IC Chip Kit Back Light Diode Filter Coil For iPhone 6 6P 7 7P Replace Backlight Control IC Replacement Accessory|Hand Tool Sets| - AliExpress
Tim Stinchcombe - Diode Ladder Filters (including the pretension to 18dB)