This Electronic Mail Box circuit generates music intimating the arrival of mail. The circuit uses a high bright White LED and an LDR to detect the arrival of mail in the box. IC NE 555 is designed as ...
Here are some DIY LDR switch circuits available on our website and the web. LDR switches are used to switch a relay or other device when light are present or absent. LDRs or Light Dependent Resistors ...
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