How does a timer circuit work?

The trigger is an active low trigger, which means that the timer starts when voltage on pin 2 drops to below one-third of the supply voltage. When the 555 is triggered via pin 2, the output on pin 3 goes high. In most 555 circuits, this pin is simply connected to ground, usually through a small 0.01 μF capacitor.

What is transistor timer circuit?

Created on: 27 July 2012. When the circuit is powered by a 9V battery, the LED switches on. A switch (or link on the breadboard) is closed to start the timer causing the LED to switch off for a time period. After the time period is over, the LED will switch on again.

What is a 556 timer?

The 556 timer is a 14 pin configuration is shown in the figure. Each Timer is provided with its own threshold, trigger, discharge, control, reset, and output pins. This IC can be used for both the oscillator as well as pulse generator due to the availability of two separate 555 timers.

What is the meaning of VCC in electronics?

Voltage Common Collector
VCC (Voltage Common Collector) is the power supply of a device .

What is the resistor for a 5 minute timer?

A variable resistor of 1M is used here and set on 55k ohm (measured by multimeter). We can easily calculate the resistor value for 5 minute, 10 minute and 15 minute timer circuit: So to build a 5 minute timer circuit, we would be simply changing the resitor value to 272.7k ohm in above given 1 minute timer circuit.

How to set a timer to 15 minutes?

15 Minutes Timer Circuit: For setting the timer to 15 minutes, change the value of resistor R1, using the below formula: T= 1.1* R1*C1 Now, the time is 15 minutes and will be equal to (15 x 60) seconds. The value of the capacitor will remain same for all the timer circuit.

What does a 1 minute timer circuit do?

1 Minute Timer Circuit. As the name suggest 555 timer is basically a “Timer”, which create an oscillating pulse. It means for some time output pin 3 is HIGH and for some time it remains LOW, that will create a oscillating output.

What does a 1 minute IC 555 timer do?

1 Minute Timer Circuit using IC 555 As the name suggest 555 timer is basically a “Timer”, which create an oscillating pulse. It means for some time output pin 3 is HIGH and for some time it remains LOW, that will create a oscillating output.