Labels:text | diagram | plan | technical drawing | schematic | line | parallel OCR: Event Failure Alarm Brought to you by: TOM CAT DOMAIN BBS 208-375-6571 Vcc +9v R2 1meg R1 + 8 VITL 4.7k 4 7 3 555 6 C1 and R2 control delay 2 1 5 + Q1 C2 +. :"C1 . 01uf When power is applied, C1 starts to charge through R2. Unless $1 is closed BEFORE the timing cycle is com- pleted, the buzzer will sound. Use any switch for S1 and it can be mounted externally from the circuit. S1 Q1=2N3906 C1=2.2uf to 47uf
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