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Design uses six IDC 2×8 connectors with 4 positions D Switch, three position, dual pole double throw, separate symbols K switch SPST LED OFF-ON lamp D Single Pole Single Throw (SPST) switch, separate symbol D Push button switch, generic, two pins Operational amplifier, DIP-8 Audio Jack, 2 Poles (Mono / TS) | | S3 | 1 | LED | Light emitting diode Push button switch OFF-(ON CMOS General Purpose Timer, 555 compatible, PDIP-8"/>

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