Tag: astable

Astable mode of 555 timer

Description: Astable mode of 555 timer is used to generate pulses at regular interval. READ ABOUT ASTABLE MODE.  The following schematic has been taken from...

FREE 555 timer simulators for electronics beginners

All of us know that NE555(or other versions) is a versatile IC for building big and small projects. Recently, I found some free simulators...

Combine two dark sensors and make an easy clap switch

CHECK RECENTLY PUBLISHED "CLAP SWITCH WITH TOGGLE FEATURE".  It is always good to break a big project into small modules and test them separately. After...

Light activated police siren using 555 timer and light dependent resistor(LDR)

Here's a simple light activated police siren using light dependent resistor and NE555 timer. Before you make this project, I would recommend you to...

How to use electret microphone

An electret is a permanently charged dielectric. It is made by heating a ceramic material, placing it in a magnetic field then allowing it...

Blinker using arduino and NE555 timer IC

Make blinker using arduino as well as NE555 timer IC.

Digital Object Counter using LDR and digital IC

555 timer configured in monostable mode is a simple automatic dark sensor circuit that gives output when light falling on LDR is blocked.

Remote operated musical bell

Remote operated musical bell can be made combining the following circuits. a) Remote tester b) Basic RC circuit c) Simple Musical bell When a remote is pressed, the circuit plays a music. a) Remote tester

Mode of NE555- Astable

This circuit has been configured in Astable mode. The output pulses are determined by the values of resistors R1, R2 and the timing capacitor C1. The formula for the frequency of pulses is: f= 1.44/[(R1+2R2)*C1].

Sound generator and Musical toy organ

One of the main objectives of LDR Engineering projects is to make students capable of developing their own logic for making devices. Here is an example that tells how LDR Engineering helps in developing ideas.

Toggle switch

This 555 timer circuit below toggles the LED when a button is pressed. Pins 2 and 6, the threshold and trigger inputs, are held at 1/2 the supply voltage by the two 10K resistors.

Sound generator using 555

Circuit given below is configured on astable mode of operation. In place of a fixed resistance, LDR has been kept for getting variable resistance for the 555 timer to work in astable mode.

Mode of NE555- Astable

This circuit has been configured in Astable mode. The output pulses are determined by the values of resistors R1, R2 and the timing capacitor C1. The formula for the frequency of pulses is: f= 1.44/[(R1+2R2)*C1]. The high and low time of each pulse can also be calculated.

Mode of NE555- Monostable

Monostable mode of operation Monostable mode of operation of 555 IC can be explained using a simple touch sensitive circuit. Here, timing constant (T) of monostable timer= 1.1*R1*C1. The following circuit has been configured in monostable mode. A monostable circuit produces a single pulse(for a certain duration determined by the Timing Constant(T)=1.1*R1*C1) when triggered at pin 2.

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