basic astable 555

177

03:16:58

An astable  555 circuit that fires a relay to switch two LEDs, the RC  network creates the  triggering for pin 2  which is 1/3 of the rail voltage. pin 2 has control over pin 6 so  i tied them together. pin 7 is the discharge  and goes low when pin 2 is triggered. what is also cool is that pin 4 reset overides the all operations. If pin 4 is High  then the circuit works as should but if you need to stop it put pin 4 to ground and it will stop.  I have included a switch to see that happen. The control has a capacitor to ground. I  also put a switch and a potentiometer to see the change  and control the toggling of the LEDs.  For the relay coil I like using 500 ohms, I liked the response. 

published 9 years ago

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