LED Running Display Using NE555

Here's a circuit to build a led based running display using easily available general purpose timer IC NE555 and a popular decade counter IC CD4017. This display consist of 24 LED's of four layers. The NE555 is wired as an astable multivibrator whose output triggers CD4017 counter.

Servo Motor Tester Circuit

This circuit allows you to isolate the servo motor from the project circuit and feed it with pulses of varying width nd checking the angle that the servo motor turns to. the circuit is built using two NE555 IC's and a few discrete components. IC1 is set as an astable multivibrator with a time period of 20 ms. Every 20 ms, the astable provides a very sharp negative pulse to trigger IC2. Timer IC2 is configured as a monostable multivibrator that produces 1ms, 1.5ms and 2ms long pulses to rotate the servo motor (M1). 

Rotation Sensor Circuit Using 555

The picture shows the circuit diagram of a rotation sensor that can turn on a device like motor or buzzer while the circuit assembly rotates. The circuit is based on basic 555 timer operation.

Electronic Harmonium Using 555

Here's the circuit diagram of a simple electronic harmonium that can produce all the seven notes. As timer IC 555 based design, the circuit is very simple to assemble and use. It only requires single 555 IC, one or two capacitors and some resistors.

Rain Sound Generator Using NE555

The circuit diagram shows a timer 555 based rain sound generator. The circuit requires a 9V dc power supply and can be fed from a 9V battery.  The loud speaker for producing sound is of 0.5W 8ohm speaker.The circuit will readily generate a rain like sound whenever the circuit fed by a 9V supply.

Firecracker Igniter Using 555

Firecrackers are usually ignited by using a matchstick or candle. But this method has high risk factor so you have to run away after igniting the firework. The circuit described here allow you to ignite the fireworks from a safe distance using a an infrared remote control of your TV or DVD.

Car Wiper Control Using 555

In rainy seasons, it is very annoying that wiper of your car wiping instantly all the time. Have you ever think of speed control of the wiper?.There are wiper control modules available on the market but most of them are costly. So here is an automatic wiper control circuit which enables you to control your wiper sweep rates from 1 second to 10 second.

Touch Control Switch Using 555

Here is the circuit diagram of an automatic touch plate controller using NE555 IC. The circuit turns on a relay when anyone touches the input metal plate for a short period of time. After then it switch off the relay or controlled device automatically. This circuit can be connected to calling bells, Buzzers, small toys etc.

Photo Timer Circuit Using 555

Here is a circuit that is become useful for photo studio owners. This 555 timer circuit switch on and off a light (exposure lamp) in a specific time. Basically this is a timer circuit however we connect a relay to the output. The relay used here is a 12V dc relay and operating current is less than 200mA.

Burglar Alarm System With High Sensitivity

Most standard light sensors that used in ordinary burglar alarm systems requires precise alignment of light beam to deactivate the alarm system during standby mode. However this circuit of burglar alarm is so sensitive that it will detect a moving person at a distance of few meters in pure daylight or under electric lighting.It requires virtually no set up, and may be simply placed within the line-of-sight of almost any light source including ambient daylight or high end fluorescent electric light. The alarm system uses a beep generated from the circuit driven through a buzzer that is high enough to detect the entry of a person inside the fence.