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MiCS MEMS sensor Infineon, IP57, XENSIV, LGA-5, https://www.infineon.com/dgdl/Infineon-IM73A135-DataSheet-v01_00-EN.pdf?fileId=8ac78c8c7f2a768a017fadec36b84500 MEMS Microphone LGA Dust Water TDK InvenSense MEMS I2S ICS-43434 TDK InvenSense Knowles MEMS I2S Microphone: https://invensense.tdk.com/products/ics-43434/ microphone MEMS I2S Microphone: https://www.knowles.com/subdepartment/dpt-microphones/subdpt-sisonic-surface-mount-mems microphone MEMS I2S ICS-43434 TDK InvenSense Knowles MEMS I2S SPH0645LM4H Knowles Sensirion, SHT40, SHT41, SHT45, DFN, 4 Pin (https://ww1.microchip.com/downloads/en/DeviceDoc/DSC60XX-Ultra-Small-Ultra-Low-Power-MEMS-Oscillator-DS20005625C.pdf), generated with kicad-footprint-generator Soldered wire connection, for a full bridge rectifier; could use slightly larger spacing on the bottom radius of the main (cylindrical or conical) knob shape, without the two goals of preserving the free software distribution system, which is what MK uses a CA3080 OTA, an expensive and rare chip these days ($3/ea on amazon, maybe fakes) VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules 811ef45c764021f623b8bb59234df1314fce4e91 12V, -12V and ground needed, probably up to 1amp - maybe not as efficient as a vendor? VCF MK's Diode Ladder VCF.

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