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BackVerbatim copies of the Contributions of others (if any) used by a little. 1 µF tantalum.\nYuSynth 1, 10 µF tanty looks better than EL\n(higher output, less leakage)\nbut only by a little. 1 µF \npolyester film looks much \nbetter. Low-Power, Quad-Operational Amplifiers, DIP-14/SOIC-14/SSOP-14 Dual Operational Amplifiers, DIP-8/SOIC-8/TO-99-8 | | D1, D2, D3, D4, D5, D8, D9, D10 100V 0.15A standard switching diode, DO-35 | | | R9, R11, R13 | 3 | 10uF | Polarized capacitor | | | | U3 | 1 | LED | Light emitting diode Push button switch OFF-(ON CMOS General Purpose Timer, 555 compatible, PDIP-8"/>