December 2014

Simple OFF delay timer circuit using IC 555

As you may know, there are three types of timer circuits: ON delay timer, OFF delay timer and the PERIODIC timer. Here is the circuit of OFF delay timer using IC 555. Circuit diagram Working When supply is connected to the circuit keeping the push-to-on switch in OFF condition, the output of the IC remains…

Filed Under: Bifocal Electronics
IC555 mini projects

Practical circuit of touch timer using IC 555

It is an interesting application of IC 555. The trigger pin-2 of the IC is sensitive to human touch. This property is used in the circuit. Circuit diagram Working In this circuit when supply is connected, the output of the IC remains LOW and the relay remains deactivated. The timing capacitor C1 remains discharged into…

Filed Under: Bifocal Electronics