Design Your Circuit. Part XI- Schmitt Trigger in Action


Design of the popular Timer IC 555 is so interesting and this tiny chip can be exploited in various ways to make different types of circuits. It can be a Monostable, Astable, Bistable, Toggle, Schmitt trigger etc. The Schmitt trigger action is achieved by exploiting the activities of its two internal comparators. Let us make an Automatic Porch light using the Schmitt trigger property of IC 555. It is an ideal circuit to light the premises of home even if the inmates are not there.

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Familiarize Electronic Components Part XI – Timer IC 555


IC 555 is the most popular timer IC used in various applications. It is used both in analogue and digital circuits to generate short duration pulses. This single IC can be used in various modes like Monostable, Astable, Bistable, Schmitt trigger etc. It is important to know the internal details and working of this IC before using in a circuit. If it is not properly used, the result will not be satisfactory and there is chance for false triggering of the circuit.

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Know the meaning of Transistor and IC Codes


Transistors and ICs are coded so as to identify its semiconductor, use, type, make etc. By using the codes, it is easy to select the appropriate component for the circuit. See the meaning of these codes.

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Code Reading Lamp


Here is a dual colour lamp to read the code printed on the Transistors and ICs. The code and number printed on the black coloured body of these components are difficult to read if the room light is low since the printing is in faint colour or as impressions. This LED lamp is useful to identify the components easily.

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Clock Controlled Relay


You can switch on a load such as Water pump automatically at the required time through this Clock Controlled Relay. It uses an ordinary clock to trigger the circuit to switch on the load. The load remains on till it is switched off manually.


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IC 555 Astable Mode


Timer IC 555 is widely used in both analogue and digital circuits to generate short duration pulses. It can be designed as Monostable and Astable multivibrator and also as Bistable, Schmitt trigger etc. In the Astable Mode, the output gives high and low pulses based on the value of timing resistor and timing capacitor. The Note given here is useful to calculate the frequency of oscillation and timing cycle.

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IC 555 Design Note


IC 555 is the popular timer Integrated circuit inevitable for many timer applications. It is widely used in both analogue and digital circuits to generate short duration pulses. It can be designed as Monostable and Astable multivibrator and also as Bistable, Schmitt trigger etc. It is important to know the internal details of the IC 555 as well as its working to design a circuit error proof.

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