Red Alert Star Trek Alarm Siren, #2


Red Alert Alarm, Schematic

Parts List:R1,R4 = 4K7C1 = 100uF/25V, electrolytic R2 = 47K C2,C3 = 0.01uF (10nF), ceramic R3 = 10KC4 = 470uF/25V, electrolytic R5 = 100K C5 = 10uF/25V, electrolytic R6 = 12K IC1,IC2 = 555 Timer/Oscillator R7 = 120 ohmD1,D2,D3 = 1N4001 R8 = 2K7 Q1 = 2N3906 LS = Loudspeaker, 8 ohmQ2 = 2N3904 Q3 = 2N3055

Notes:
UNDER CONSTRUCTION.



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