BLINKING LED WITHOUT ANY ACTIVE COMPONENTS
by mkpeker in Circuits > Electronics
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BLINKING LED WITHOUT ANY ACTIVE COMPONENTS
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.
Setting up the Circuit
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