Two-tone alarm circuit design of 555 design
The pin functions and applications of the 555 series ICs are compatible, but the models are different in terms of their price, their stability, power saving, and the oscillating frequency that can be generated. The 555 is a very versatile and quite common type. The timing IC, with a small number of resistors and capacitors, can generate pulse signals of various frequencies required by the digital circuit. The circuit consists of two 555 or a 556 time base circuit and some RC components. IC1 is a low frequency oscillator with an oscillation frequency of about 1 Hz; IC2 is an audio multivibrator with a frequency of about 15,000 Hz.
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