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OBJECTIVE Timer IC 555 is versatile general-purpose linear integrated circuits and is thus the most widely used one. It is indeed a favourite with hobbyists. It is mostly used either as a monostable or an astable multivibrator. In this project activity, we shall present some modified circuits for monostable and astable operation of timer IC [...]
Written by David on January 9th, 2010 with no comments.
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OBJECTIVE Here is a simple and very easy to build alarm siren producing gadget capable of producing five different types of siren tones. The gadget is built around a single IC 556 which is nothing but a dual IC timer 555.That is, it has two independent 555s within the same package. The type of siren [...]
Written by David on January 9th, 2010 with 1 comment.
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OBJECTIVE Wide fluctuations in the AC mains voltage is a very common problem in India. You should not be surprised if some one tells you that the voltage fluctuation could be as much as from 150 volts to 290 volts. Although, majority of our electrical and electronic appliances and gadgets have some kind of voltage [...]
Written by David on January 8th, 2010 with 4 comments.
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Objective The objective here is to construct an emergency fluorescent light circuit that requires neither a choke nor a starter unlike conventional mains operable fluorescent light. Such emergency lighting units having different lighting power capabilities are available in abundance in the market. The circuit given here is simple and highly| efficient. It operates from a [...]
Written by David on January 8th, 2010 with 2 comments.
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Objective It is an ideal project for those who want to build something that not only teaches them something but also gives them lot of fun. As the title suggests, this gadget can be used to measure quantitatively the reaction time of an individual. The reaction time can be measured in two different settings: In [...]
Written by David on January 8th, 2010 with 1 comment.
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OBJECTIVE The objective here is to build a 3l/2-digit digital voltmeter with a standard instrument sized LED display. It may be mentioned here that the IC type number ICL7107 is almost universally used for digital voltmeter application and the cirduit shown in Fig. 18.1 is basically what you would discover inside any digital panel meter [...]
Written by David on January 8th, 2010 with 1 comment.
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OBJECTIVE The project under construction here is a DIGITAL STOPWATCH that could count time up to a maximum of 99.9 seconds with a resolution of 0.1sec (or in steps of 0.1 sec) or up to a maximum of 999 seconds with a resolution of 1 second. This has been possible by having two clock frequency [...]
Written by David on January 7th, 2010 with no comments.
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OBJECTIVE A simple, easy to build portable all electronic resistance meter that can be used to accurately measure resistances up to a maximum of 1MΩ is the project under construction here. The circuit operates from twin 9V batteries. The resistance meter has a linear scale and the zero resistance point appears on the extreme left [...]
Written by David on January 7th, 2010 with no comments.
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OBJECTIVE Believe it or not, there are numerous occasions when you have switched. on your TV set to watch a specific program of your interest and you found out that there are still a few more minutes to go. The options before you are to either remain glued on to the TV get and wait [...]
Written by David on January 7th, 2010 with no comments.
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OBJECTIVE Here is a simple battery charger circuit, the one that can be used to charge 12 volt batteries of both the usual automobile type as well as the maintenance free sealed lead-acid type. The charger circuit being described here is quite compact can be placed right on the top of the battery required to [...]
Written by David on January 7th, 2010 with 3 comments.
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OBJECTIVE The objective is to build a fully automatic emergency light that remains off in the normal circumstances and switching on automatically in the event of mains power failure. Such gadgets are very useful when used in places such as electricity meter box or the place where the various cut outs are located. The other [...]
Written by David on January 5th, 2010 with 5 comments.
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OBJECTIVE The circuit shown in Fig. 14.1 is that of a simple analog capacitance meter built around IC 555. It operates from a 9V battery and a provision for mains operation is also there. This test gadget can be used to measure capacitance values over a range from . 0.0001µF to 100 µF. CIRCUIT DESCRIPTION [...]
Written by David on January 5th, 2010 with 2 comments.
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