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Emergency Light and Alarm Circuit | 1 view(s)
This circuit> is permanently plugged into a mains socket and NI-CD batteries are trickle-charged. When a power outage occurs, the lamp automatically illuminates. Instead of illuminating a lamp, an alarm sounder can be chosen.
Component parts list:
- R1 = 220K
- R2 = 470R
- R3 = 390R
- R4 = 1K5
- R5 = 1R
- R6 = 10K
- R7 = 330K
- R8 = 470R
- R9 = 100R
- C1 = 330nF/400V Polyester Capacitor
- C2 = 10µF/63V Electrolytic Capacitor
- C3 = 100nF/63V Polyester Capacitor
- C4 = 10nF/63V Polyester Capacitor
- D1-D5 = 1N4007
- D6 = LED Green
- D7 = 1N4148
- Q1,Q3,Q4 = BC547
- Q2,Q5 = BC327
- SW1,SW2 = SPST Switches
- SW3 = SPDT Switch
- LP1 = 2.2V or 2.5V 250-300mA Torch Lamp Bulb
- SPKR = 8 Ohm Loudspeaker
- B1 = 2.5V Battery (two AA NI-CD rechargeable cells wired in series)
- PL1 = Male Mains plug
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