Light dependent blinker using LDR and CD4093

Here’s a simple experiment with LDR and CD4093. This is just a modification of a previous project “dark sensor using 2 transistors”. In this project, the CD4093 is configured in such a way that whenever you blockĀ  light falling on LDR, the circuit starts blinking the LED D1.

The flasher circuit does not get power till there is enough light on LDR. The CD4093 circuit gets power via emitter of Q2- BC547 when you block light falling on LDR. (more…)

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