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Audible Logic Probe (NE556)

2016-09-05 05:34  
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This article describes the Audible Logic Probe (NE556). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components: NE556.

We can use NE556 timer IC to make indication of static of terminal in digital logic audible.? Audible logic probe can be very useful when we have to visually inspect a part while need to check the logic state on other point apart from the part.? Here’s the circuit diagram:


Audible Logic Probe circuit schematic


NE556 will act as oscillator controlled by IC1 (SN74132N) and IC2 (SN7486N). Audio beep will indicate and detect any logic transition from1 to 0 or 0 to 1, lasting at least 50 ns. LED provide visual indication . LED will glow when input logic is 1.? [Source: seekic.com]


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