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light-activated-alarm

light-activated-alarm

R11K5Q1R21KR310KR410KR5330R+9VSP18 OhmLoudspeakerPN222PN222100n100nC2C1R82K2R710KPN2907R64K7R9LDRPN222Q2Q3Q412Light Activated Alarm
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publish time: 2020-10-26
Circuit Everyday

The 500K variable resistor produces the melody with the required amount of light. After adjusting the required light intensity, the circuit will produce the melody with the same amount of light every day.You can also use this circuit as a light activation alert for other light sources, to which you must also adjust the 500K variable resistor to produce the melody based on the amount of light required.The melodic circuit is built around UM66 IC, a CMOS IC encapsulated by to-92 transistors.

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