Introduction

The Light Alarm is a circuit that sounds a buzzer when the light level falling on the circuit reaches a certain level. However, once triggered, the circuit will continue to beep even if the light falls below the trigger level and this can be useful in security situations where a burglars torch activates the alarm! So, how does this circuit work and what makes it better than other light detection circuits? Build this kit and find out!

Included in her kit

• 1 x LM358
• 1 x 555 Timer
• 1 x 4013
• 2 x 8 DIP Socket
• 1 x 14 DIP Socket
• 1 x 100nF Capacitor
• 1 x 10uF Capacitor
• 2 x 1K Resistor
• 2 x 10K Resistor
• 1 x 56K Resistor
• 1 x Potentiometer
• 1 x 1N5817 Diode
• 1 x 2N3904
• 1 x Buzzer
• 1 x Tactile Switch
• 1 x Photodiode
• 2 x Wire (Red and Black)
• 1 x PCB

What makes it special?

MitchElectronics kits are designed with education in mind and as such use high quality double sided PCBs. The through-hole plating of each pad means that even the most novice of builders will not be able to tear traces or break pads (unlike many other professional kits which only use single sided boards to save costs). These kits are also RoHS compliant which make them safe to use and no kits use non-RoHS components such as LDRs (which contain Cadmium).