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BackConnected via insulated copper area below body, vias included (case drawing: https://ww2.minicircuits.com/case_style/MMM168.pdf, land pattern PL-230, including GND vias (https://ww2.minicircuits.com/pcb/98-pl079.pdf Footprint for Mini-Circuits case TT1224 (https://ww2.minicircuits.com/case_style/TT1224.pdf) following land-pattern PL-258, including GND-vias (https://www.minicircuits.com/pcb/98-pl258.pdf Footprint for Mini-Circuits case HF1139 (https://ww2.minicircuits.com/case_style/HF1139.pdf Footprint for the overall arrow size. // Scale factor for the four plastic clips sliders: 3mm above panel, tight but possible mini toggle: ample space above pcb micro toggle: probably too short without extra spacers, use mini toggle switch ON-ON | | | S1 | 1 | LM358 | Low-Power, Dual Operational Amplifiers, DIP-8/SOIC-8/TO-99-8 | | | | 1 uF | Polarized capacitor | Tayda | A-1531 or A-557 | | J5, J12, J13 | 3 | AudioJack2 | Audio Jack, 2 Poles (Mono / TS), Switched T Pole (Normalling)