IC 555
Car Battery Low Indicator
Almost every one of us has fallen prey to a flat battery at one time or the other. On the lighter side, batteries some how have an uncanny sense of failing at our urgent moment. Here is circuit that gives a general indication of the health of the car battery and warns you to give [...]
Burglar Alarm for Car Stereos
We have another interesting application of 555. This is used as a burglar alarm for car stereos. Thieves have, some how, the knack of removing the car stereos even though all the car doors are closed and locked. If we forget to close any window, these people will have a field day. This circuit can [...]
Light Alarm (Sun Up Alarm)
This circuit designed to sound a loud alarm at the break of the dawn especially for those wh cannot wake up even with an alarm clock. Circuit can be modified as an intruder alarm or as a security alarm. Needless to say that 1.8 KHz astable multivibrator with 555 is used here again with a [...]
Water High Level Alarm using IC 555
This is a big brother of the earlier piezo version, which can be used as an alarm when filling overhead tanks or as a water tap flow indication. Unlike the piezo version, this alarm can give out fairly loud tone and can even be amplified further up. Tone can also be varied to suit individual [...]
Basic Oscillator (Tone Generator) At 1.8 KHz -alarm circuits
Here we have an astable oscillator built around 555, which gives an alarm tone of 1.8 KHz directly driving a speaker. This is basic alarm circuit, which is later used in many other projects in the book. While the circuit shows only 1.8 KHz operation, it can be adapted to different applications by changing frequency [...]
IC555 Interal diagram and description
IC 555 has been one of the most popular ICs since Signetics introduced it in the early 70s. 555 is also called as a TIMER IC. This 8-pin chip is a versatile device suitable for astable, mono-stable and bi-stable operations. It is such a multipurpose device that hobbyists find clever uses of it everyday. It [...]
