Light Alarm
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!
Instructions / Documentation
Product specifics
- Component Count: 22
- Battery Powered?: No
- Operating Voltage: 5V
- Operating Frequency: N/A
- Output Voltage: N/A
- Output Current: N/A
- Dimensions (PCB): 52mm x 33mm
- Mounting Holes: No
- Prebuilt: No – Kit form
- Batteries Not Included
Included in this kit
- 1 x 14 DIP Socket
- 2 x 8 DIP Socket
- 1 x 4013
- 1 x LM358
- 1 x 555
- 1 x 100nF Capacitor
- 1 x 10uF Capacitor
- 2 x 1K Resistors
- 2 x 10K Resistors
- 1 x 56K Resistor
- 1 x 10K Potentiometer
- 1 x 1N5817
- 1 x 2N3904
- 1 x Buzzer
- 1 x Tactile Switch
- 1 x Photodiode
- 1 x Red Wire
- 1 x Black Wire
- 1 x PCB
Applications
The light alarm is ideal for applications that need to provide security protection against tampering. For example, the alarm can be mounted inside a safe that is typically kept in the dark. Upon an intruder opening the safe and shining a light into the container, the alarm will be triggered. The light alarm project is also ideal for those new to electronics who want to create a practical project that can be experimented with afterwards. For example, those undertaking GCSE and A-Level electronics who want a practical project that teaches about sensors would find the Light Alarm kit highly suitable.
Notes
Note that product specifics such as output frequency depend on the tolerance of the components. The numbers provided here are an approximation only. Also take note that the estimated delivery is not guaranteed (unless special delivery is chosen) and free delivery has a maximum waiting time of two weeks. Any product that is returned which is built using lead solder is ineligible for a refund.
All parts sold by MitchElectronics are compliant with RoHS and REACH directives which ensure that they can be used in commercial environments as well as complying with environmental laws. Watch the video below to learn more about RoHS compliance and why it may be important for your next DIY project!
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