This is a window comparator that supplies a 3-step sequencer of output signals. Pressing S1 discharges C1 and lights Led 1 (and Led 2 briefly). C1 then charges through R4. As charge on C1 passes 3 and 6 volts, leds 2 and 3 glow in sequence. Reduce R2 to balance time delay sequence and reduce delay time. Delays shown will vary with tolerance of C1.
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