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Oscilloscope-Triggered Sweep using 555 IC (NE555)

2015-01-29 02:19  
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This article describes the Oscilloscope-Triggered Sweep using 555 IC (NE555). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy these components:NE555.

We can use the 555 timer to hold the cost down of adding a triggered sweep to an economy oscilloscope. The timer is triggered by the circuit’s input op amp, adjusting its flip-flop and cutting off its discharge transistor so that capacitor C can charge. The flip-flop resets and the transistor conducts when capacitor voltage reaches the timer’s control voltage (0.33Vcc), discharging the capacitor. By substituting a constant-current source for the frequency adjust resistor (R), we can achieve greater linearity. Here’s the circuit diagram:

Oscilloscope Triggered Sweep circuit schematic diagram

 


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