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Probably a straightforward build: one op-amp, four transistors and some example modules Envelope/Envelope.kicad_pcb | 2 aoKicad | 1 | SW_Push | Push button switch, generic, two pins Audio Jack, 2 Poles (Mono / TS), Switched T Pole (Normalling) | | C4, C5 | 2 | 47k | Resistor | | | Tayda | A-553 | | | | | R24, R26, R28 | 3 | AudioJack2 | Audio Jack, 2 Poles (Mono / TS), Switched T Pole (Normalling) Small Signal NPN Transistor, TO-92 Operational amplifier, DIP-8 Standard switching diode, DO-35"/>

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