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One tl074 and support components, so tiny PCB should be possible, too Manual trigger * See manual step button in Unseen Servant Primary source: ## Kassutronics Precision ADSR with mods Low-Power, Quad-Operational Amplifiers, DIP-14/SOIC-14/SSOP-14 Low-Power, Quad-Operational Amplifiers, DIP-14/SOIC-14/SSOP-14 Dual Operational Amplifiers, DIP-14/SOIC-14 | | | | Tayda | A-3588 | \** Use only four (4) potentiometers, either 9 mm or 16 mm vertical board mount | | | | C10 | 3 | A1M | \*\*Potentiometer, 16 mm vertical board mount OR: | | | | | | Q1, Q2, Q3 | 3 | 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 KK254 Molex header | | | R5, R29 | 3 | A1M | Potentiometer | | | | J3 | 1 | 3_pin_Molex_header | 3 | 1k | Resistor | | R114 | 1 | 10R | Resistor | | | U1 | 1 | 1 | B20k | Potentiometer | | R24, R26, R28 | 4 .../PCB/precadsr_Gerbers/precadsr-B_Paste.gbr.

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