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555 IC for Square Wave Tone Burst Generator

2015-02-04 10:05  
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Square wave tone bursts is provided by depressing the pushbutton. It’s duration depends on the duration for which the voltage at Pin 4 exceeds a threshold. Astable action of the timer IC is caused by components R1, R2, and C1. Here’s the circuit diagram:

Square Wave Tone Burst Generator circuit schematic diagram

[Source: Philips Semiconductors Application Note]

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