Innovative Ways Of Using Timer IC 555
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 555 and see for ourselve show these changes simplify design. In two of the four different circuits given here, the circuits have been so modified as to yield very simple and design friendly expressions for the monostable and astable operations. In case of modified astable circuit, the expressions for output frequency becomes f = 1/RC where (R) is charge path resistance equal to the discharge path resistance and (C) is the capacitance. In a read more
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5 IN 1 Alarm Gadget
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 can be selected from an appropriate combination of switches to be closed given in the accompanying table. The gadget could also be constructed using two 555s in place of one 556. CIRCUIT DESCRIPTION For a clear understanding of this circuit functioning, it is very important to identify those pins in IC556 that represent two independent 555’s. IC555 has eight terminals namely the COMMON (Pin-1), TRIGGER (Pin-2), OUTPUT (Pin-3), RESET (Pin-4), CONTROL (Pin-5), THRESHOLD read more
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