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Part 1 Overview of IC timers: introduction to RC timer circuits; TTL and CMOS digital IC timers; the LM-555 RC timer IC device; 555 monostable operation; 555 astable multivibrator circuits; other IC timers; operational amplifier timer circuits; retriggerable timers; long duration timers. Part 2 Timer projects and circuits: touchplate trigger; missing pulse detector; pulse position circuit; tachometry using a one-shot circuit; analogue audio frequency meter; one-second timer/flasher; level translation of LM-555 output; 100kHz oscillator; relay and optoisolator drives; frequency synchronized operation; code practice oscillator; tone generator; warble siren/alarm; two-phase digital clock; sixteen-phase clock; power failure alarm; DC-to-DC converter; visual continuity tester; aural continuity tester; 100kHz crystal calibrator; pulse catcher circuit.