Introduction: BLINKING LED WITHOUT ANY ACTIVE COMPONENTS
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About: Orthopaedic Surgeon, Paragliding, Skiing, Digital electronics, Microcomputer lover.
In this instructable, we will learn how to blink a LED without any Transistor, IC or tricks..
This circuit is a RC Relaxation oscillator and it uses LDR's delayed
reaction against Light. So; phototransistors or Optocouplers cannot work in this way.
This circuit designed to Blink in dark. So at sunlight it dont blinks.
Power consumption is very very low that, this circuit can work for years with just two AA batteries.
It can be used as fake alarm outside of your House.
Thank you.
Step 1:
Setting up the Circuit
Step 2: PARTS LIST
10K LDR (light dependent resistor)
33 Kohm Resistor
Bright white led (regular, not self blinking!)
22K resistor (or 2x10K)
10 uF electrolytic capacitor
Two AA 1.5 Batteries
Breadboard
A few Jumper cables
