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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 it. MSD: L* L* -> only second half of normal; muffle optional? A series of boards, e.g. Https://learn.adafruit.com/adafruit-feather-m0-radio-with-rfm69-packet-radio Adafruit Feather M0 RFM Footprint for Mini-Circuits case GP731 (https://ww2.minicircuits.com/case_style/GP731.pdf Footprint for Mini-Circuits case CD542 (https://ww2.minicircuits.com/case_style/CD542.pdf) using land-pattern PL-052, including GND-vias (https://ww2.minicircuits.com/pcb/98-pl035.pdf.

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