Security Alarm With LDR (Soldering Kit)

6 pc(s)
KIT-03195

$4.50

This fun little soldering kit allows you to make a light activating security alarm. Using an LDR (Light dependent resistor) and an NPN transistor, the LED and buzzer will activate if light shinning on the LDR is above the pre-set threshold. The kit comes with a hardcopy construction guide....
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This fun little soldering kit allows you to make a light activating security alarm.

Using an LDR (Light dependent resistor) and an NPN transistor, the LED and buzzer will activate if light shinning on the LDR is above the pre-set threshold. The kit comes with a hardcopy construction guide.

You should be able to assemble this kit in 10-30 minutes with basic soldering skills. The kit is powered using two AAA batteries.

Tools required (not included in this kit):

  • Soldering tools
  • Wire cutter

Note: For limited period, we throw in free batteries and also upgrade the battery holder to one with cover.

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