Table of Contents
What is the working of IC 555?
The 555 timer IC is an integrated circuit (chip) used in a variety of timer, delay, pulse generation, and oscillator applications. Derivatives provide two (556) or four (558) timing circuits in one package. It was commercialized in 1972 by Signetics….555 timer IC.
| First production | 1972 |
| Electronic symbol | |
|---|---|
| Internal block diagram |
What is the function of the trigger pin in 555 timer?
It is the Trigger pin to activate the IC’s timing cycle. It is generally low signal pin and the timer is triggered when voltage on this pin is below one third of the supply voltage.
What is the minimum and the maximum supply voltage of the 555 timer IC?
Supply- voltage operating range for the 555 is +4.5 volts (minimum) to +16 volts (maximum), and it is specified for operation between +5 volts and + 15 volts. The device will operate essentially the same over this range of voltages without change in timing period.
Why is it called IC 555?
The 555 Timer IC got its name from the three 5KΩ resistors that are used in its voltage divider network. This IC is useful for generating accurate time delays and oscillations.
What is the function of pin number 5 of the IC 555?
Pin 5: Control Voltage Terminal: The threshold and trigger levels are controlled using this pin. The pulse width of the output waveform is determined by connecting a POT or bringing in an external voltage to this pin. The external voltage applied to this pin can also be used to modulate the output waveform.
What is the function of trigger pin?
The pin functions as both an input and an output. A trigger output pin will generate output triggers from any subsystem that has been configured to output trigger signals.
What is the threshold voltage for a 555 timer with a supply voltage of 12 V?
555 supply (pins 1 and 8) The 555 timer can be used with a supply voltage (Vs) in the range 4.5V to 15V (18V is the absolute maximum).
What is IC 555 timer pin diagram?
Pin diagram and description
| Pin | Name | Purpose |
|---|---|---|
| 7 | DIS | Open collector output which may discharge a capacitor between intervals. In phase with output. |
| 8 | Vcc | Positive supply voltage, which is usually between 3 and 15 V depending on the variation. |
What is the name of pin 4 in the 555 timer?
Reset: Pin 4 is the reset pin, which can be used to restart the 555’s timing operation. Like the trigger input, reset is an active low input.
What is a simple metal detector circuit diagram?
A simple metal detector circuit diagram project is designed using IC 555, as you can see in the 555 timer circuits, these circuits detect the metals and magnets. When a magnet is near to the 10mH choke, the o/p frequency changes.
What is the LC circuit of a metal detector?
The LC Circuit, which consists of L1 (coil) and C1, is the main metal detector part of the circuit. With the help of this LC Circuit, which is also called as Tank Circuit or Tuned Circuit, the TDA0161 IC acts as an oscillator and oscillates at a particular frequency.
How does a metal detector work?
How these two concepts are used together for a metal detector circuit, is explained in working section of this project. The figure shows the circuit diagram of metal detector . The 555 IC timer here acts as a square wave generator and it generate pulses with frequencies audible to human.
What is the function of 555 IC timer?
The 555 IC timer here acts as a square wave generator and it generate pulses with frequencies audible to human. The capacitor between pin2 and pin1 should not be changed as it is need to generate audible frequencies. In the circuit there is an RLC circuit formed by 47K resistor, 2.2µF capacitor, and 150turn inductor.