Lamp Flashing Alarm | Electronic Project Circuits

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Emergency Light and Alarm

Powered by two AA NI-CD batteries, Four switchable options

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. When power supply is restored, the lamp or the alarm is switched-off. A switch provides a “latch-up” function, in order to extend lamp or alarm operation even when power is restored.

Parts:
R1____________220K 1/4W Resistor
R2____________470R 1/2W Resistor
R3____________390R 1/4W Resistor
R4______________1K5 1/4W Resistor
R5______________1R 1/4W Resistor
R6_____________10K 1/4W Resistor
R7____________330K 1/4W Resistor
R8____________470R 1/4W Resistor
R9____________100R 1/4W Resistor

C1____________330nF 400V Polyester Capacitor
C2_____________10µF 63V Electrolytic Capacitor
C3____________100nF 63V Polyester Capacitor
C4_____________10nF 63V Polyester Capacitor

D1-D5________1N4007 1000V 1A Diodes
D6______________LED Green (any shape)
D7___________1N4148 75V 150mA Diode

Q1,Q3,Q4______BC547 45V 100mA NPN Transistors
Q2,Q5_________BC327 45V 800mA PNP Transistors

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
Read more source : http://www.redcircuits.com/Page45.htm

Be the first to comment - What do you think? Posted by admin - February 13, 2011 at 8:37 pm

Categories: Audio diagram, Lighting Tags: Emergency Light, lamp flashing alarm

Lamp flashing alarm automatic

Amplifier circuit that use transistor 2 pcs , by have Regenerative feedback send pulse of current 60mS. Which there is tall size arrives at many Amp change low volt lamp for brightness rate of winking many by don’t go to destroy lamp.

Be the first to comment - What do you think? Posted by admin - June 3, 2009 at 8:22 am

Categories: Alarm systems, Lighting Tags: lamp flashing alarm, lamp light

Easy Lamp Flasher to warn

This is lamp flasher circuit. It is use transistor 2 pcs. For the system shows matters for objection which rub encourage give work by the alarm. An officer will take the alarm by pressure the Secretariat of the switch Sa. Which will change a light bulb from the winking to sticking bright is unfinished. a tube is model 6V size entrailses will pull the trend s about 0.3A change transistor Q2. But a resister that is load of transistor Q1 that will limit the trend that change the transistor 6mA very thus. Then transistor that have small-sized can get down.