Emergency Light & Alarm

Warning! The circuit is connected to 220Vac mains, then some parts in the circuit board are subjected to lethal potential!. Avoid touching the circuit when plugged and enclose it in a plastic box.

Powered by two AA NI-CD batteries
 Four switchable options

• 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
• SPKR 8 Ohm Loudspeaker
• B1 2.5V Battery (two AA NI-CD rechargeable cells wired in series)
• PL1 Male Mains plug